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Review of Host Trees for the Wood-Boring Pests Anoplophora glabripennis and Anoplophora chinensis: An Urban Forest Perspective

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Two devastating insect pests have been introduced to North America and Europe – the Asian longhorned beetle (ALB) (Anoplophora glabripennis) and the citrus longhorned beetle (CLB) (Anoplophora chinensis). These two wood-boring beetles are argued to be one of the most serious threats to the tree landscape since they have a large number of host species and genera. With the aim of creating an up-to-date compilation of these hosts, a systematic review was made of the literature for information on tree species attacked and used by ALB and CLB as hosts for complete life cycle or for feeding. This review revealed that a large number of tree species and genera are liable to be attacked by ALB and CLB. However, based on the findings, the whole picture is still unclear. One reason for this is the lack of transparency in published studies regarding lists of susceptible tree species for ALB and CLB. Another factor that needs to be reported is whether a tree species supports the complete life cycle of the beetles or just feeding by adult beetles. Without this information, species possessing moderate host qualities are at risk of being incorrectly labelled as very good hosts and hence excluded as urban trees.
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Arboriculture & Urban Forestry 40(3): May 2014
©2014 International Society of Arboriculture
143
Henrik Sjöman, Johan Östberg, and Johan Nilsson
Review of Host Trees for the Wood-Boring Pests
Anoplophora glabripennis and Anoplophora
chinensis: An Urban Forest Perspective
Arboriculture & Urban Forestry 2014. 40(3): 143–164
Abstract. Two devastating insect pests have been introduced to North America and Europe – the Asian longhorned beetle (ALB) (Ano-
plophora glabripennis) and the citrus longhorned beetle (CLB) (Anoplophora chinensis). ese two wood-boring beetles are argued to be
one of the most serious threats to the tree landscape since they have a large number of host species and genera. With the aim of creating
an up-to-date compilation of these hosts, a systematic review was made of the literature for information on tree species attacked and used
by ALB and CLB as hosts for complete life cycle or for feeding. is review revealed that a large number of tree species and genera are
liable to be attacked by ALB and CLB. However, based on the ndings, the whole picture is still unclear. One reason for this is the lack of
transparency in published studies regarding lists of susceptible tree species for ALB and CLB. Another factor that needs to be reported
is whether a tree species supports the complete life cycle of the beetles or just feeding by adult beetles. Without this information, spe-
cies possessing moderate host qualities are at risk of being incorrectly labelled as very good hosts and hence excluded as urban trees.
Key Words. Anoplophora chinesis; Anoplophora glabripennis; Asian Longhorned Beetle; Citrus Longhorned Beetle; Host; Pests; Review;
Tree Selection; Urban Trees; Wood-boring Pests.
Today, the urban forest and its constituent trees are
much more than an aesthetic green element in cit-
ies. Aspects such as biological diversity, stormwater
management, pollution relief, benecial and recre-
ational impacts on human well-being, and urban
heat island mitigation are some of the services ur-
ban tree vegetation provides for city dwellers (For-
man and Godron 1986; Grahn and Stigsdotter 2003;
Maco and McPherson 2003; Tyrväinen et al. 2005;
Geldof and Stahre 2006; Nowak et al. 2006; King
and Davis 2007). In the compact city, the quali-
ties provided in large parks and green areas will be
compressed into smaller scale units or alternative
green structures, increasing the demands on ca-
pacity load and performance level of future urban
green space and future urban trees (Sjöman et al.
2012a). Since trees are long-lived organisms and
their capacity to deliver ecosystem services is not
completely developed until they are fully grown
individuals, it is of the utmost importance that
the trees selected today last into the future. How-
ever, today’s urban trees and forests are facing great
diculties with pests and diseases and with a chang-
ing climate, which can compromise their future
development and functions. It is therefore important
to determine which species and genera of trees can
meet these future challenges (Sjöman et al. 2012b).
In the last decades, two important and devas-
tating insect pests have been introduced to North
America and Europe – the Asian longhorned beetle
(ALB) (Anoplophora glabripennis) and the citrus
longhorned beetle (CLB) (Anoplophora chinensis).
ese two wood-boring beetles are argued to be
one of the most serious threats to the tree landscape
since they have a large number of host species and
genera (e.g., MacLeod et al. 2002; Raupp et al. 2006;
Hu et al. 2009; Haack et al. 2010). Well-known hosts
for ALB in China include species of Acer, Alnus,
Betula, Eleagnus, Fraxinus, Malus, Platanus, Popu-
lus, Pyrus, Salix, Sophora, and Ulmus (Haack et al.
2010). In the United States, ALB has completed
development on species in the genera Acer, Betula,
Fraxinus, Pyrus, Salix, and Ulmus, but also in spe-
cies of Robinia (Haack et al. 2010), indicating that
this beetle is expanding its host range as it invades
new territories and encounters new potential host
SjÖman et al.: Host Trees for Wood-Boring Pests: An Urban Forest Perspective
©2014 International Society of Arboriculture
144
species with devastating biological and economic
consequences. For example, Nowak et al. (2001)
used tree inventories to estimate potential mon-
etary losses resulting from ALB in nine cities in
the United States and reported an estimated loss of
approximately 1.2 billion trees, at a compensatory
value of USD $669 billion. To combat pests such as
the longhorned beetle, providing a large diversity of
tree species and genera is argued to be one of the
most important solutions. erefore, it is essential,
in the long-term planning of the urban treescape, to
use tree species and genera that face a minimal risk
of being attacked by these two wood-boring pests.
e aim of this study was to create an up-to-
date compilation of the tree species that ALB and
CLB attack and use as hosts for a complete life
cycle or for feeding. A systematic literature sur-
vey (Wright et al. 2007) was conducted to identify
relevant species and the ndings were assessed
in terms of origin, method used, and any weak-
nesses and limitations in the information provided.
MATERIALS AND METHODS
Biology and Distribution of the
Longhorned Beetles
To understand the information presented in the re-
view and the following discussion, it is important
to understand the biology and distribution of the
two longhorned beetle species. e native range
of ALB includes China and Korea, while that of
CLB also includes Japan with occasional records
from Indonesia, Malaysia, Philippines, Taiwan,
and Vietnam (Lingafelter and Hoebeke 2002). e
life cycles of ALB and CLB are similar and well de-
scribed (Haack et al. 2010). Adult beetles undergo
a one- to two-week period of maturation, feeding
on foliage and tender bark on the twigs of host
trees before beginning to reproduce (Keena 2002;
Smith et al. 2002). e females of ALB chew slits
or funnel-shaped holes through the bark of host
trees and lay their eggs under the bark, while CLB
females only chew slits before laying the eggs. Only
a single egg is laid in each oviposition site (Lin-
gafelter and Hoebeke 2002; Hérard et al. 2006).
ALBs typically initiates oviposition along the upper
trunk and main branches (Haack, 2006), whereas
CLBs usually lay eggs along the lower trunk, root
collar region, and on exposed roots (Hérard et
al. 2006). Larvae feed in the cambium and then
bore into the wood, where they continue to feed,
eventually forming a pupal chamber. Larval bor-
ing produces structural weakness and disrupts
the ow of water and nutrients within host trees,
leading to death of branches and ultimately whole
trees. Adult feeding on twigs and foliage is con-
sidered of minor importance, except occasionally
on fruit-bearing trees. Most damage results from
larval tunneling in the cambial regions and wood.
Both species attack healthy and stressed trees,
varying in size from small bonsai and potted trees
(especially CLB) to mature trees (Haack et al. 2010).
Outside their native range, both ALBs and CLBs
have caused tree mortality and are ranked as high-
risk quarantine pests (MacLeod et al. 2002). Both
ALB and CLB have been intercepted in wood pack-
aging material associated with imports, such as
steel, ironware, pottery, and other materials, as well
as in living plants, such as bonsai or nursery stocks
originating primarily from China. e main intro-
duction of ALB into new regions has been through
wood packaging material, while CLB has mainly
been introduced through living plants (Haack
et al. 2010). e rst discovery of an established
population of ALB outside of its native range was
in North America in 1996 (Haack et al. 1997), and
that of CLB in Europe in 2000 (Hérard et al. 2006).
Host Tree Review
e literature reviewed to nd information con-
cerning host trees for ALB and CLB included sci-
entic articles and ocial documents concerning
invasive pests. e search included the Google
Scholar, Scopus, and CAB abstract databases (ISI
Web of Knowledge), and the reference lists within
the publications found in these databases. In the
initial search in the databases, the search terms
used were: Asian longhorn beetle, citrus longhorn
beetle, ALB, CLB, Anoplophora glabripennis, and
Anoplophora chinensis. Since Anoplophora mala-
siaca is argued to be a synonym of A. chinensis
(Lingafelter and Hoebeke 2002), researchers also
included this name in the search. In the compilation
of literature, the search was limited to publications
written in English, Swedish, Norwegian, Danish,
Dutch, French, German, and Italian. For publica-
tions written in Chinese and Japanese with an ab-
stract in English, only the abstract was included.
Arboriculture & Urban Forestry 40(3): May 2014
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In total, 35 publications were found with infor-
mation concerning host species for these two long-
horned beetles. e suitability of tree species as hosts
was ranked as: very good host, good host, host, and
rare/resistant based on information in the literature
reviewed—for denitions used to classify hosts, see
Table 1 (Yin and Lu 2005). In the publications stud-
ied (Appendix 1; Appendix 2; Table 2), there was
lack of consistent information on whether there is a
complete life cycle of the beetles in the trees or if the
adult beetles were simply feeding. When the infor-
mation was imprecise regarding how a beetle attacks
and feeds on a tree species, the species was ranked
provisionally as a host. Information regarding the
possibility for larva development by the beetles was
included for all species (Appendix 1; Appendix 2).
e information found in the review was then
further analyzed in terms of aspects such as the
origin of the ndings [i.e., whether the informa-
tion had been obtained through controlled green-
house studies or studies in natural environments
or plantations (Appendix 3)]. e geographical
focus of the study was also included, as were any
citations of the publication in the Scopus data-
base. Host-related information within the studies
was also analyzed to trace its origin (Appendix 3).
RESULTS AND DISCUSSION
Of the 35 papers reviewed, 29 contained informa-
tion on host trees for ALB, while only 13 had cor-
responding information for CLB. e total number
of papers exceeded 35, since some studies covered
both ALB and CLB and were therefore counted twice
(Appendix 1; Appendix 2; Appendix 3; Table 2).
In the compilation of host trees for ALB, 36
species were mentioned as a host to some degree,
while 31 genera were described as being at risk of
attack—these genera obviously included many
more than 36 species. e species described
most frequently as a host to some degree was
Acer platanoides, followed by A. saccharum and
A. negundo. e genera described most compre-
hensively as a good host for ALB were Populus
spp., Salix spp., and Acer spp., followed by Betula
spp., Ulmus spp., and Platanus spp. (Appendix 1).
In the compilation of host trees for ALB, there
were also 31 species and 16 genera that were
described as resistant or rarely infested (Appendix
1). However, as can be seen from Appendix 1, there
were some clear contradictions concerning which
species and genera were susceptible. For example,
some publications described a particular genus
or species as a host to some degree, while oth-
ers described them as resistant or rarely infested.
Further, ve publications described Tilia spp. as a
host for ALB (Nowak et al. 2001; Ric et al. 2006;
Hu et al. 2009; Jordbruksverket 2010; APHIS 2012),
while two other publications stated that the genus
of lime trees is rarely aected or even resistant
(Haack et al. 1997; Raupp et al. 2006). is contra-
diction regarding which species can be character-
ized as hosts is even more pronounced in studies
focusing on poplar trees (Populus spp.) and their
susceptibility to ALB. Since there has been enor-
mous use of poplar trees to counteract deserti-
cation in northwestern China, several studies
evaluate these poplar plantations and outbreaks
of ALB (Lingafelter and Hoebeke 2002; Yin and
Lu 2005; Yang 2005; Hu et al. 2009 and references
therein). In these studies, it is obvious that not all
poplar species are classied as a very good host for
ALB, even if the genus is described as one of the
Table 1. Division of host susceptibility into: very good host, good host, host, and rare/resistant.
Host grade ALB and CLB feeding and life cycle features Impact on tree growth
Very good host Attracts longhorned beetles. Extensive feeding Dieback of whole tree crown
by adult beetles. Complete life cycle with population or entire tree
increase
Good host Moderate feeding. Can complete life cycle Dieback on some branches. Dieback
of whole tree crown or entire tree
if stressed
Host Limited feeding by adult beetles. Small number of Normal growth. Slight damage
eggs laid. Can escape attack if nearby trees are with recovery wounds
more susceptible
Resistant or No feeding activity by adult beetles; no eggs laid Normal growth
rarely aected
SjÖman et al.: Host Trees for Wood-Boring Pests: An Urban Forest Perspective
©2014 International Society of Arboriculture
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most susceptible (Appendix 1 and Table 2). In the
division between poplar species with diering sus-
ceptibility to ALB, it is obvious that there are dif-
ferences between sections in the genus, with species
within the sections Populus and Turanga even being
classied as resistant or rarely infested (Table 2).
e compilation on CLB included fewer publica-
tions describing host trees. However, the number of
host species described was much greater than for ALB.
In total, 108 species were described as a potential host
for CLB, while the number of genera was 73 (Appendix
2). In the literature reviewed, no species or genus was
described as resistant or rarely aected by CLB. e spe-
cies described most frequently as a host to some degree
were Acer palmatum and A. platanoides, followed by
A. pseudoplatanus and Aesculus hippocastanum. e
genera described most comprehensively as a good host
for CLB were Acer spp., Malus spp., and Citrus spp., fol-
lowed by Populus spp. and Platanus spp. (Appendix 2).
In an attempt to make an up-to-date compilation
of host trees for ALB and CLB, researchers identied
great confusion in the literature, which weakened
the information and may lead to incorrect conclu-
sions and recommendations. In host-related publi-
cations, there was much cross-referencing between
the papers, making it dicult to identify the origin
of the information and how it was obtained. Since
a large proportion of the publications on ALB are
in Chinese, it is even more dicult to evaluate
the background to the conclusions presented in
abstracts. Later publications, basing their informa-
tion on Chinese and Japanese studies (e.g., Haack et
al. 1997; Nowak et al. 2001; Lingafelter and Hoebeke
2002; Yin and Lu 2005; Yang 2005; Hu et al. 2009),
Table 2. Categorization of poplar species as hosts for ALB according to Gao et al. (1997), Ludwig et al. (2002), Wang
(2004), Yin and Lu (2005), Yang (2005), and Hu et al. (2009).
Category Species/hybrids Section
Very good hosts Populus nigra: ‘Pyramidalis’, ‘Italica’, ‘evestina’ Aigeiros
Populus deltoides ‘Brangarsi’ Aigeiros
Populus × euramericana: ‘Luisa Avanzo, ‘Bellini’, ‘Guardi Aigeiros
Populus × xiaozhuannica, P. × xiaozhuannica: ‘Opera’, ‘Popularis’ Aigeiros × Tacamahaca
Good hosts Populus nigra Aigeiros
Populus deltoides Aigeiros
Populus lasiocarpa Leucoides
Populus pseudoglauca Leucoides
Populus cathayana Tacamahaca
Populus gansuensis Tacamahaca
Populus pseudosimonii Tacamahaca
Populus simonii Tacamahaca
Populus ussuriensis Tacamahaca
Populus simonii × P. nigra ‘Pyramidalis’: ‘Baichensis, ‘Taiqing’, ‘Italica’ Aigeiros × Tacamahaca
Populus nigra × P. simonii Aigeiros × Tacamahaca
Populus × beijingensis Aigeiros × Tacamahaca
Populus × berolinensis Aigeiros × Tacamahaca
Populus × dakuanensis Tacamahaca
Populus × russki Aigeiros
Populus stalinetz Aigeiros
Populus × xiaohei, P. × xiaohei ‘Heilin-1’
Aigeiros
× Tacamahaca
Occasional hosts Populus deltoides: ‘Nankang’, ‘Qingji #1, 2’, ‘Shanhaiguan’, ‘pyramidalis’ Aigeiros
Populus balsamifera Tacamahaca
Populus alba ‘Pyramidalis’ Populus
Populus alba × Populus bolleana Populus
Populus alba × Populus tomentosa Populus
Populus deltoides × P. simonii Aigeiros × Tacamahaca
Populus × euramericana (= P. × canadensis) Aigeiros
Populus × euramericana ‘Veruirubens’, ‘Vegeherata 272’, ‘G-158’, ‘I-214’, Aigeiros
‘Triplo, Gattoni’, ‘Cima’
Rare hosts or Populus euphratica, P. euphratica: ‘Pyramidalis’, ‘PE-214’ Turanga
resistant hosts Populus pruinosa Turanga
Populus alba Populus
Populus davidiana Populus
Populus hopeiensis Populus
Populus tomentosa, P. tomentosa ‘Hopeinica’, ‘Honanica Populus
Populus tremula Populus
Populus tremuloides Populus
Arboriculture & Urban Forestry 40(3): May 2014
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mainly presented the ndings quantitatively with a
concluding list of susceptible species, and without
a qualitative description of how these conclusions
were reached. For example, Yang (2005) and Yin
and Lu (2005) reviewed Chinese research concern-
ing ALB but presented the ndings very briey and
without an introduction to the methodology and
approach used in the studies. is might be the rea-
son why there are some contradictions regarding the
suitability of dierent species and genera in Appen-
dix 1. Furthermore, it is oen unclear whether the
ndings listed in the appendices and Table 2 refer to
damage by adult beetles, as specied by Ludwig et al.
(2002), Morewood et al. (2003), and Morewood et
al. (2004a), or refer to use of the trees for oviposition
and larval development. Such information is rarely
presented in the publications reviewed, which weak-
ened the information and leads to further confusion.
In the compilation of host trees for the two long-
horned beetles, there was a rather large amount of
information concerning tree genera, which of course
include many more species than those listed in the
appendices and Table 2. Including whole genera as a
host, for example, CLB may cause the use of a whole
genus to be banned, even if there are just a few spe-
cies that are susceptible and the rest are resistant
or rarely aected. When interpreting information
from one study in another, it is tempting to simplify
the information. An example is Van der Gaag et al.
(2010), presenting a list of hosts for CLB based on
original data in Lingafelter and Hoebeke (2002),
most of which was in turn based on information in
Chinese and Japanese studies (Appendix 3). Lin-
gafelter and Hoebeke (2002) listed a large number
of species as hosts for CLB, but in the compilation
by Van der Gaag (2010), much of this species infor-
mation was changed to whole genera, without fur-
ther information. is simplication of host-related
information can result in great confusion and mis-
understanding, especially if it is used by national
authorities to formulate recommendations on trees
to avoid in example urban environments. e pres-
ent review uncovered clear evidence that there are
species within highly susceptible genera that are
resistant or rarely aected. For example, Williams et
al. (2004) evaluated 12 maple species in native com-
munities of South Korea for ALB damage and found
that only ve species (three native and two invasive
exotic species) had visible damage or adult ALB,
leaving seven species with no observed damage.
Furthermore, even within the poplar genus, which
is considered the most susceptible to ALB, there is
evidence that sections within this genus are resis-
tant or rarely aected (Weilun and Wen 2005). In a
compilation by Hu et al. (2009) based on data from
Yin and Lu (2005) and Gao et al. (1997), poplar spe-
cies belonging to the section Turanga (e.g., Populus
pruinosa Schrenk) and Populus (e.g., Populus alba
L., P. tomentosa Carr., and P. tremula L.) were listed
as less susceptible or slightly resistant to ALB (Bao
et al. 1999; Table 2). ese examples of resistant spe-
cies within highly susceptible genera might indicate
that there has been generalization regarding the
species and genera classied as hosts. If several spe-
cies have been shown to be susceptible to ALB, it is
easy to conclude that the whole genus is susceptible.
e fact that the rst discovery of longhorned
beetles outside their native range took place in 1996
in New York (ALB) (Lingafelter and Hoebeke 2002)
is reected in the geographical focus of the publica-
tions reviewed. ALB host-related publications older
than 1996 were mainly produced in China, Japan,
and Taiwan (Appendix 3), while publications later
than 1996 had a greater focus on North America.
CLB host-related publications later than the year
2000 mainly had a European focus, following the
rst recognized outbreak in Europe (Appendix 3).
Information about whether a tree species is a
host, good host, or very good host was fairly com-
monly provided in the literature reviewed. However,
it was more dicult to nd clear denitions of the
terms used to describe the kind of damage done
by the beetles to the tree. Terms used commonly
in the literature were: infested, attacked, host, and
feeding. For the beetles to become established in
an area they not only need to nd food, but also to
be able to propagate, which means nding suitable
tree species for oviposition and larval development
into fully developed beetles. Ric et al. (2006) noted
that not all tree species are suitable for the whole
reproduction cycle. For example, some species are
suitable for oviposition but not larval development.
Other species are used for feeding by the adult
beetles but not for oviposition. e terms infested,
attacked, host, and feeding do not clearly describe
whether the tree is used for feeding by adults or
whether full larval development is possible. Haack
et al. (1997) used “primary host tree” and “occa-
SjÖman et al.: Host Trees for Wood-Boring Pests: An Urban Forest Perspective
©2014 International Society of Arboriculture
148
sional host tree,” “attack primarily” and “complete
development” in the “Range and Life Cycle” section
for ALB. Hérard et al. (2006) mentioned infested
trees and host plants without specifying the mean-
ing, and stated that certain species were preferred
host plants, but not whether this meant feeding, ovi-
position, or full development. FAO (2007) explained
that the larvae injure the tree by tunnels under the
bark and bore into wood, but when listing trees spe-
cies it stated “the main genera of trees that it feeds
on are. . .” is is confusing, as adult beetles feed on
some trees but oviposition and larval development
do not always occur on the same species as adult
feeding. e Danish Natural Agency (Naturerh-
vervstyrelsen 2012) concluded that one should dis-
tinguish between host plants where the beetles can
undergo full development, and host plants where
the adults feed on the trees. ere are several exam-
ples of rating systems that include the possibility of
a reproductive cycle for the species. For example,
Yin and Lu (2005) used a scale from 1 to 5 to rate
tree species, where grades 3 to 5 included the ALB
being able to complete a life cycle. Ric et al. (2006)
used a three-point rating system, where 1 was suit-
able for the entire life cycle, 2 was where the bee-
tles had laid eggs but there was no evidence that a
whole cycle was possible, and 3 was for species with
unknown suitability for beetle larval development.
Among the studies concerning ALB, Lud-
wig et al. (2002), Smith et al. (2002), MacLeod et
al. (2002), Morewood et al. (2003; 2004a; 2004b;
2005), Auclair et al. (2005), and Hajek and Kalb
(2007) had obtained their host-related informa-
tion from greenhouse tests, while the remaining
publications appeared to refer to cases and obser-
vations in native communities or in public planta-
tions. Only one of the 13 studies of CLB reviewed
had obtained host-related information from
greenhouse tests (Adachi 1994; Appendix 3). To
develop more accurate species-related informa-
tion concerning susceptibility to ALB and CLB,
some authors point out that controlled laboratory
tests are needed (MacLeod et al. 2002; Morewood
et al. 2004a). However, when beetles are introduced
to one or few species in a controlled environment,
they may use less favorable species in the absence
of more susceptible species. erefore, host-related
conclusions from controlled laboratory or green-
house tests must be thoroughly analyzed. How-
ever, if a species in these tests shows resistance to
the beetles, this could be important information. In
the review by Yin and Lu (2005), a number of tree
species native to China were classied as resistant
or rarely aected by ALB (Appendix 1). In fact, the
majority of the species/genera classied as resistant
or rarely aected by ALB in Appendix 1 are native
to China and Japan, where they have been living for
generations, side-by-side with the beetle and might
have developed natural strategies to avoid attacks.
For example, there may be chemical substances
in the wood making it unattractive for feeding or
unsuitable to support complete development of
the ALB (Morewood et al. 2004a). Once the bio-
chemical basis of resistance against ALB and CLB
is elucidated, researchers may have a greater under-
standing of species that are superior to use, while
any biocidal compounds produced could perhaps
be manipulated to help protect more vulnerable
trees from these pests. In the study by Morewood
et al. (2004a), an evaluation of four tree species for
ALB in controlled greenhouse conditions showed
that the Chinese callery pear (Pyrus calleryana) was
most likely to cause adult mortality of the beetle.
No larvae survived, although eggs in callery pear
hatched and the neonates began to feed and con-
struct galleries in the wood. In work on ALB and
CLB, it is interesting to know not only which spe-
cies are resistant or rarely aected by these beetles,
but also why they are resistant or rarely aected.
Data on citations of host-related information
within the publications reviewed here clearly revealed
a large number of cross-references, especially among
recent studies. For example, the paper by Lingafelter
and Hoebeke (2002) was included in six other pub-
lications as a host-related reference, but they in turn
based their host-related information mainly on
older Chinese and Japanese studies (Appendix 3).
is pattern of much older host-related informa-
tion originating from Chinese studies, especially for
ALB, makes it dicult to analyze the methodology
and approach used in the studies or to evaluate from
where and how the conclusions were developed. e
most frequently cited publication within this review
(that by Nowak et al. 2001) used three Chinese stud-
ies (in Chinese) and two unpublished sources from
North America as the basis for a host-related evalu-
ation. More recent studies from North America and
Europe make a much more transparent presentation
Arboriculture & Urban Forestry 40(3): May 2014
©2014 International Society of Arboriculture
149
of the studies, which makes it possible to evaluate
the ndings. However, the international reviews
included within the present study (Lingafelter and
Hoebeke 2002; Hu et al. 2009; Haack et al. 2010)
based much of their host-related information on
Chinese studies, written in Chinese (Appendix 3).
Furthermore, it is important to know the envi-
ronments in which the beetles have been studied.
In forest types, where very good hosts are absent,
the beetles use more “non-traditional” species and
genera to a much larger amount than when more
suitable host trees are available. is scenario
can lead to one author reporting that a species or
genus is a very good host and another concluding
that the same species or genus is rarely or never
infested. Among the publications reviewed, eight
based their host-related information for ALB
and CLB on natural environments or plantations
(Appendix 3) but provided no information on
the species composition, structure, or succession
phase of the habitat or plantations studied. is
makes it dicult to analyze the results presented.
Studies in habitats reported larger numbers of
highly susceptible species than those in homoge-
neous sites or plantations. is scenario of includ-
ing more suitable species is exploited in practice
in China, where ‘trap trees’ that are more utilized
by ALB are included to protect other species. No
studies concerning ‘trap trees’ for CLB were found.
Furthermore, Williams et al. (2004) concluded
that the varying dynamics of ALB populations
across its geographical range may indicate that it
is an ‘edge specialist’ that evolved in riparian habi-
tats. is aspect of understanding the preferred
habitat or ecosystem of the beetle was seldom
evaluated in the literature reviewed. Instead, the
information reported originated from dierent
kinds of plantations with quantitative observa-
tions mainly in urban areas of China or North
America (Hu et al. 2009; Haack et al. 2010), with-
out further evaluation of ecosystem preferences.
CONCLUSIONS
e wood-boring Asian longhorned beetle and cit-
rus longhorned beetle may pose serious threats to
the tree landscape worldwide since they have many
host species and genera. It is therefore important
to identify susceptible tree species and genera in
order to produce future tree loss scenarios and
plan future urban forests (e.g., by selecting less sus-
ceptible urban trees). is literature review found
many tree species and genera that are liable to be
attacked by ALB and CLB, but further informa-
tion is needed. ere is a lack of transparency in
published studies listing susceptible tree species
for ALB and CLB. It is important to know where
and how these studies obtained their informa-
tion—especially the older studies. Later studies
use a much more transparent approach, but more
information from the natural environment of the
beetles in China and Japan is highly important in
understanding why some species and genera are
resistant or rarely aected. Another area where
more information is needed regarding host trees
for ALB and CLB is whether the tree species sup-
port the complete life cycle of the beetles or just
feeding by adult beetles. An accepted and interna-
tionally used conceptual ranking system is needed,
describing what exactly makes a tree species a very
good host or just a host. Without this system, there
is a risk of incorrectly labeling species with mod-
erate host qualities as a very good host and hence
banned from use as an urban tree. Another impor-
tant aspect is to thoroughly evaluate host trees on
species level and not include the whole genus, even
if many species within the genus are susceptible.
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Henrik Sjöman (corresponding author)
Swedish University of Agricultural Sciences
Faculty of Landscape Planning
Horticulture and Agricultural Science
Department of Landscape Architecture, Planning and Management
Box 66, SE-23053
Alnarp, Sweden
henrik.sjoman@slu.se
Johan Östberg
Swedish University of Agricultural Sciences
Faculty of Landscape Planning
Horticulture and Agricultural Science
Department of Landscape Architecture, Planning and Management
Box 66, SE-23053
Alnarp, Sweden
johan.ostberg@slu.se
Johan Nilsson
Swedish University of Agricultural Sciences
Faculty of Landscape Planning
Horticulture and Agricultural Science
Department of Landscape Architecture, Planning and Management
Box 66, SE-23053
Alnarp, Sweden
Zusammenfassung. Zwei verheerend wirkende Schadinsekten
sind nach Nordamerika und Europa eingeschleppt worden: der
Asiatische Laubholzbock und der Zitrusbock. Diese beiden holz-
bohrenden Insekten werden als größte Gefahr für unsere Baum-
landscha betrachtet, da sie ein großes Wirtsspektrum von Arten
und Gattungen haben. Mit dem Versuch, eine aktuelle Zusammen-
stellung dieser Wirte zu kreieren, wurde eine systematische Über-
sicht über die Literatur mit Informationen zu den mit den beiden
Laubbockkäfern befallenen Arten, die den Käfern für ihren gesam-
ten Lebenszyklus als Wirt dienten oder als Fraßquelle genutzt wur-
den. Diese Übersicht enthüllte, dass eine sehr große Anzahl von
Arten und Gattungen von diesen Käfern attackiert und gefressen
werden. Dennoch bleibt der Eindruck nach diesen Ergebnissen un-
klar. Ein Grund dafür liegt in diesem Mangel an Transparenz in den
veröentlichen Studien bezüglich der bevorzugten Baumarten die-
ser beiden Käfer. Ein anderer Faktor, der erwähnt werden müsste,
ist der Umstand, ob der Baum den ganzen Entwicklungsprozess des
Bockkäfers unterstützt oder ob der nur von adulten Insekten gefres-
sen wird. Ohne diese Informationen können Bäume mit nur mod-
eraten Wirtseigenschaen als solche mit hervorragenden Wirtsei-
genschaen gekennzeichnet und somit als geeigneter Stadtbaum
ausgeschlossen werden.
Resumen. Dos devastadoras plagas de insectos se han intro-
ducido en América del Norte y Europa - el escarabajo asiático de
cuernos largos (ALB ) (Anoplophora glabripennis) y los escaraba-
jos cítricos (CLB ) (Anoplophora chinensis). Estos dos escarabajos
perforadores de la madera se argumentan ser una de las amenazas
más graves para los árboles urbanos, ya que tienen un gran núme-
ro de especies y géneros hospederos. Con el objetivo de crear una
compilación actualizada de estos hospederos, se hizo una revisión
sistemática de la literatura para obtener información sobre las espe-
cies de árboles atacados y utilizados por ALB y CLB como antrio-
nes para completar el ciclo de vida o para la alimentación. Esta re-
visión reveló que un gran número de especies de árboles y géneros
son susceptibles de ser atacados por ALB y CLB. Sin embargo, con
base en los resultados, el panorama aún es poco claro. Una razón
de esto es la falta de transparencia en los estudios publicados con
respecto a las listas de especies arbóreas susceptibles de ALB y CLB.
Otro factor que debe ser reportado es si una especie de árbol so-
porta el ciclo de vida completo de los escarabajos o simplemente
alimenta a los adultos. Sin esta información, las especies que poseen
cualidades moderadas de hospedaje están en riesgo de ser etiqueta-
dos incorrectamente como muy buenos hospederos y por lo tanto
excluidos como árboles urbanos.
SjÖman et al.: Host Trees for Wood-Boring Pests: An Urban Forest Perspective
©2014 International Society of Arboriculture
154
APPENDIX 1.
Species/genera host grades for ALB according to the literature.
Full development means that a full beetle development can take place or that exit holes are present. Feeding means that the adult
beetles feed on the tree species but there is no claim that full development can take place or that exit holes are present. No informa-
tion means that there is no information on the type of development or investment is present.
is appendix is based on the following articles: Haack et al. 1997; Nowak et al. 2001; Lingafelter and Hoebeke 2002; Ludwig et al.
2002; MacLeod et al. 2002; Smith et al. 2002; Morewood et al. 2003; Morewood et al. 2004a; Morewood et al. 2004b; Williams et
al. 2004a; Auclair et al. 2005; CFIA 2005; Morewood et al. 2005; Weilun and Wen 2005; Yang 2005; Hérard et al. 2006; Raupp et al.
2006; Ric et al. 2006; FAO 2007; Hajek and Kalb 2007; Geib et al. 2009; Natur Erhvervstyrelsen 2008; Hérard et al. 2009; Hu et al.
2009; Haack et al. 2010; Jordbruksverket 2010; APHIS 2011; Dodds et al. 2011; EPPO 2012.
z A detailed description of the Populus genus is given in Table 2.
Numbers of articles Type of development
Species Total number Resistant/ Host Good Very good Full Feeding No
of studies resilient host host development information
Acer buergerianum 3 1 2 1 1
Acer ginnala 2 2 1
Acer mono 3 1 2 2 1
Acer negundo 9 3 6 1 8
Acer palmatum 2 2 1
Acer pensylvanicum 2 1 1 1 1
Acer platanoides 13 5 2 6 6 7
Acer pseudoplatanus 8 4 2 2 2 6
Acer pseudosieboldianum 1 1 1
Acer rubrum 7 2 1 4 4 3
Acer saccharinum 7 4 1 2 1 6
Acer saccharum 11 4 7 4 1 7
Acer spp. 18 6 1 11 4 1 13
Acer tegmentosum 1 1 1
Acer triorum 1 1
Acer truncatum 3 1 2 1 2
Aesculus hippocastanum 6 3 2 1 1 5
Aesculus ssp. 10 4 3 3 3 1 6
Ailanthus altissima 4 4
Albizia spp. 8 2 4 1 1 4 2
Alnus spp. 7 2 4 1 2 1 2
Amelanchier spp. 1 1
Betula nigra 2 2 1 1
Betula pendula 2 2 1 1
Betula spp. 13 5 6 2 5 8
Broussonetia papyrifera 3 2 1 1
Carpinus betulus 1 1 1
Carpinus spp. 2 1 1 1
Carya spp. 1 1
Catalpa bungei 2 2
Celtis spp. 5 4 1 2 3
Cercidiphyllum spp. 2 1 1 1 1
Cercis chinensis 2 2
Cercis spp. 1 1
Corylus spp. 1 1
Crataegus pinnatida 1 1
Crataegus spp. 1 1
Diospyros kaki 1 1
Elaeagnus angustifolia 2 1 1 1 1
Elaeagnus spp. 6 1 3 1 1 3 1 1
Arboriculture & Urban Forestry 40(3): May 2014
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Numbers of articles Type of development
Species Total number Resistant/ Host Good Very good Full Feeding No
of studies resilient host host development information
Eucommia ulmoides 1 1
Euonymus spp. 1 1
Fagus spp. 3 2 1 1
Fagus sylvatica 2 2 2
Fraxinus americana 2 2
Fraxinus mandshurica 2 2
Fraxinus pennsylvanicum 3 3 1 2
Fraxinus sogdiana 2 2
Fraxinus spp. 10 8 2 3 1 6
Gleditsia spp. 2 1 1 1
Gleditsia triacanthos 1 1
Gingko biloba 1 1
Gymnocladus spp. 1 1
Hamamelis spp. 1 1
Hedysarum spp. 1 1 1
Hibiscus spp. 7 3 3 1 1 3
Hippophae spp. 1 1 1
Juglans regia 1 1
Juglans spp. 1 1
Koelreuteria spp. 4 2 1 1 2
Liquidambar styraciua 1 1
Liriodendron chinensis 1 1
Liriodendron tulipifera 4 3 1 1
Magnolia denudata 1 1
Magnolia spp. 1 1
Malus pumila 2 1 1 1
Malus spp. 6 1 5 1 1 3
Melia spp. 6 2 3 1 1 3
Melia azedarach 2 1 1 1
Metasequoia glyptostroboides 1 1
Morus spp. 8 2 5 1 2 4
Morus alba 4 1 3 3
Ostrya spp. 1 1
Pinus spp. 1 1
Platanus × hispanica 1 1
Platanus occidentalis 1 1
Paulownia tomentosa 1 1
Platanus spp. 15 2 6 7 5 8
Populus spp.z 19 8 2 9 7 12
Prunus armeniaca 1 1
Prunus cerasifera 1 1
Prunus salicina 1 1 1
Prunus spp. 13 2 9 2 2 1 8
Punica granatum 1 1
Pyrus calleryana 4 4
Pyrus spp. 9 2 6 1 1 6
Quercus alba 1 1 1
Quercus liaotungensis 1 1
Quercus palustris 1 1 1
Quercus rubra 4 3 1 3 1
Quercus spp. 8 7 1 1
Rhus typhina 1 1
Rhamnus spp. 1 1
Robinia pseudoacacia 5 2 3 3
Robinia spp. 6 2 3 1 1 3
Appendix 1 continued on page 156
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©2014 International Society of Arboriculture
156
Numbers of articles Type of development
Species Total number Resistant/ Host Good Very good Full Feeding No
of studies resilient host host development information
Rosa spp. 2 2 2
Salix babylonica 2 2 1 1
Salix matsudana 3 1 2 1 2
Salix nigra 1 1 1
Salix spp. 18 5 2 11 6 1 11
Sambucus spp. 1 1
Sophora japonica 1 1
Sophora ssp. 3 3 1 2
Sorbus spp. 6 4 2 3 3
Syringa spp. 1 1
Tilia paucicostata 1 1
Tilia spp. 7 2 5 2 3
Toona sinensis 1 1
Toxicodendron verniciuum 1 1
Ulmus americana 1 1 1
Ulmus pumila 3 1 2 2 1
Ulmus spp. 16 6 2 8 4 1 11
Vitis vinifera 1 1 1
Viburnum spp. 1 1
Arboriculture & Urban Forestry 40(3): May 2014
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APPENDIX 2.
Species/genera host grades for CLB according to the literature.
Full development means that a full beetle development can take place or that exit holes are present. Feeding means that the adult
beetles feed on the tree species but there is no claim that full development can take place or that exit holes are present. No informa-
tion means that there is no information on the type of development or investment is present.
is appendix is based on the following articles: Adachi 1994; Lingafelter and Hoebeke, 2001; Lingafelter and Hoebeke 2002; Hérard
et al. 2006; Natur Erhvervstyrelsen 2008; van der Gaag et al. 2008; Vukadin and Hrasovec 2008; Haack et al. 2010; Jordbruksverket
2010; van der Gaag et al. 2010; EPPO 2012; Mattilsynet 2012; Netherlands Plant Protection Service 2012.
Numbers of articles Type of development
Species Total number Resistant/ Host Good Very good Full Feeding No
of studies resilient host host development information
Acacia decurrens 1 1 1
Acacia spp. 2 2 1 1
Acer campestre 2 2 2
Acer mono 1 1 1
Acer negundo 3 3 1 2
Acer oblongum 1 1 1
Acer palmatum 3 2 1 3 1
Acer platanoides 3 3 2 1
Acer pseudoplatanus 3 3 2 1
Acer saccharinum 2 1 1 1 1
Acer spp. 11 8 3 3 8
Aesculus hippocastanum 4 4 1 3
Aesculus ssp. 2 1 1 1 1
Albizia julibrissin 1 1 1
Albizia spp. 1 1 1
Aleurites fordii 1 1 1
Aleurites spp. 1 1 1
Alnus crispa subsp. Maximowiczii 1 1 1
Alnus rma 1 1 1
Alnus hirsuta 1 1 1
Alnus pendula 1 1 1
Alnus sieboldiana 1 1 1
Alnus spp. 6 5 1 1 5
Aralia cordata 1 1 1
Aralia spp. 1 1 1
Atalantia buxifolia 1 1 1
Atalantia spp. 1 1 1
Betula pendula 1 1 1
Betula platyphylla 1 1 1
Betula spp. 7 6 1 1 6
Broussonetia papyrifera 1 1 1
Broussonetia spp. 1 1 1
Cajanus cajan 1 1 1
Cajanus spp. 1 1 1
Camellia oleifera 1 1 1
Camellia spp. 1 1 1
Carpinus betulus 1 1 1
Carpinus laxiora 2 2 1 1
Carpinus spp. 5 4 1 1 4
Carya illinoensis 1 1 1
Carya spp. 1 1 1
Castanea crenata 1 1 1
Castanea spp. 1 1
Appendix 2 continued on page 158
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©2014 International Society of Arboriculture
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Numbers of articles Type of development
Species Total number Resistant/ Host Good Very good Full Feeding No
of studies resilient host host development information
Castanopsis cuspidata var. sieboldii 1 1 1
Castanopsis spp. 1 1 1
Casuarina equisetifolia 1 1 1
Casuarina spp. 1 1 1
Casuarina stricta 1 1 1
Catalpa spp. 1 1 1
Cercis spp. 1 1 1
Chaenomeles spp. 2 2 2
Citrus aurantifolia 1 1 1
Citrus aurantium 1 1 1
Citrus grandis 1 1 1
Citrus limonia 1 1 1
Citrus maxima 1 1 1
Citrus nobilis 1 1 1
Citrus sinensis 1 1 1
Citrus spp. 9 5 2 2 5 4
Cornus spp. 3 2 1 1 2
Corylus avellana 2 2 1
Corylus spp. 7 6 1 1 6
Cotoneaster spp. 5 4 1 1 4
Crataegus spp. 5 4 1 2 3
Cryptomeria japonica 1 1 1
Cryptomeria spp. 5 5 1 4
Cydonia sinensis
Eleagnus multiora 1 1 1
Eleagnus spp. 2 2 2
Eleagnus umbellata 1 1 1
Eriobotrya japonica 1 1 1
Eriobotrya spp. 2 2 1 1
Fagus crenata 1 1 1
Fagus spp. 6 5 1 1 5
Fagus sylvatica 1 1 1
Ficus carica 2 2 2
Ficus spp. 4 4 1 3
Fortunella marginata 1 1 1
Fortunella spp. 1 1 1
Fraxinus americana 1 1 1
Fraxinus spp. 1 1 1
Grevillea spp. 1 1 1
Hedera rhombea 1 1 1
Hedera spp. 1 1 1
Hibiscus mutabilis 1 1 1
Hibiscus spp. 3 3 3
Ilex chinensis 1 1 1
Ilex spp. 1 1 1
Juglans mandshurica 1 1 1
Juglans spp. 1 1 1
Lagerstroemia indica 1 1 1
Lagerstroemia spp. 6 4 1 1 3 3
Lindera praecox 1 1 1
Lindera spp. 1 1 1
Litchi sinensis 1 1 1
Litchi spp. 1 1 1
Liquidambar spp. 2 1 1 1 1
Maakia amurensis subsp. buergeri 1 1 1
Arboriculture & Urban Forestry 40(3): May 2014
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Numbers of articles Type of development
Species Total number Resistant/ Host Good Very good Full Feeding No
of studies resilient host host development information
Maakia spp. 1 1 1
Mallotus japonicus 1 1 1
Mallotus spp. 1 1 1
Malus asiatica 1 1 1
Malus pumila 1 1 1
Malus spp. 10 8 1 1 1 9
Malus sylvestris 1 1 1
Melia azedarach var. subtripinnata 1 1 1
Melia japonica 1 1 1
Melia spp. 1 1 1
Morus alba 1 1 1
Morus bombycis 1 1 1
Morus spp. 2 2 2
Olea europaea 1 1 1
Olea spp. 1 1 1
Ostrya spp. 1 1 1
Parrotis spp. 1 1 1
Persea spp. 1 1 1
Persea thunbergii 1 1 1
Pholinia benthamiana 1 1 1
Pholinia spp. 1 1 1
Pinus massoniana 1 1 1
Pinus spp. 3 3 1 2
Platanus hispanica 1 1 1
Platanus orientalis 1 1 1
Platanus spp. 9 8 1 2 7
Polygonum spp. 2 2 2
Poncitrus trifoliata 1 1 1
Poncitrus spp. 1 1 1
Populus alba 1 1 1
Populus maximowiczii 1 1 1
Populus nigra 2 2 2
Populus sieboldii 1 1 1
Populus spp. 8 8 8
Populus tomentosa 1 1 1
Prunus armeniaca 1 1 1
Prunus laurocerasus 2 2 2
Prunus mume 1 1 1
Prunus pseudocerasus 1 1 1
Prunus spp. 5 4 1 1 4
Prunus yedoensis 1 1 1
Psidium guajava 1 1 1
Psidium spp. 1 1 1
Pyracantha angustifolia 1 1 1
Pyracantha spp. 1 1 1
Pyrus hondoensis 1 1 1
Pyrus pyrifolia 1 1 1
Pyrus spp. 8 6 1 1 1 7
Quercus acutissima 1 1 1
Quercus glauca 1 1 1
Quercus robur 1 1 1
Quercus serrata 1 1 1
Quercus sessilifolia 1 1 1
Quercus spp. 5 4 1 1 4
Rhododendron spp. 3 2 1 1 2
Appenidix 2 continued on page 160
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©2014 International Society of Arboriculture
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Numbers of articles Type of development
Species Total number Resistant/ Host Good Very good Full Feeding No
of studies resilient host host development information
Rhus javanica 1 1 1
Rhus spp. 2 2 2
Robinia pseudoacacia 1 1 1
Robinia spp. 2 2 1 1
Rosa multiora 1 1 1
Rosa spp. 6 5 1 1 5
Rubus microphyllus 1 1 1
Rubus palmatus 1 1 1
Rubus spp. 2 2 2
Sageretia spp. 2 2 2
Salix babylonica 1 1 1
Salix gracilistyla 1 1 1
Salix integra 1 1 1
Salix jessoensis 1 1 1
Salix koriyanagi 1 1 1
Salix sachalinensis 1 1 1
Salix spp. 8 7 1 1 7
Sambucus spp. 1 1 1
Sapium sebiferum 1 1 1
Sapium spp. 1 1 1
Sophora spp. 2 2 2
Sorbus spp. 2 1 1 1 1
Stranvaesia benthamiana 1 1 1
Stranvaesia spp. 1 1 1
Styrax japonica 1 1 1
Styrax spp. 1 1 1
Toona spp. 1 1 1
Toxicodendron verniciua 1 1 1
Ulmus davidiana var. japonica 1 1 1
Ulmus pumila 1 1 1
Ulmus spp. 5 4 1 1 4
Vernicia spp. 1 1 1
Viburnum spp. 2 2 1 1
Zelkova spp. 1 1 1
Ziziphus spp. 1 1 1
Arboriculture & Urban Forestry 40(3): May 2014
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APPENDIX 3.
The origin of the information is divided between greenhouses/laboratories, natural environments,
review, or authority documents.
e number of citations is based on the Scopus database. Host-related information within the study is citations of tree suitability for ALB and CLB.
z Publications in Chinese with only an abstract in English
y Publications in German
x Publications in Italian
w Publications in Japanese
Origin of the study
Source Citations Beetle Green House/ Natural Plantations Review Authority Geographical focus Host-related information within
Laboratory environments document of the publication the study
Auclair et al. (2005) 9 ALB X New York & New 0
Jersey, U.S.
MacLeod et al. (2002) 37 ALB X Europe Li and Wu (1993)z, Yang et al.
(1995)z, Gine and Chein (1986)z
Morewood et al. (2005) 7 ALB X North America Bancro et al. (2002), Ludwig et
al. (2002)
Hu et al. (2009) 18 ALB X International Review Li and Wu (1993)z, Yan et al. (1996)z
Gao et al. (1997)z, Haack et al.
(1997), Bao et al. (1999)z, Li et al.
(1999)z, Lingafelter and Hoebeke
(2002), APHIS (2003); Morewood
et al. (2003), Li et al. (2005), Haack
et al. (2006), Hajek and Kalb
(2007), Maspero et al. (2007)x , Tomiczek
and Hoyer-Tomiczek (2007)y, Zhao et
al. (2007)z
Nowak et al. (2001) 107 ALB X North America Host-related information is based
on three Chinese sources and two
unpublished sources from North
America – He and Huang (1993)z,
Li and Wu (1993)z, Li et al. (1999)z
Morewood et al. (2004a) 28 ALB X North America Nowak et al. (2001)
SjÖman et al.: Host Trees for Wood-Boring Pests: An Urban Forest Perspective
©2014 International Society of Arboriculture
162
Origin of the study
Source Citations Beetle Green House/ Natural Plantations Review Authority Geographical focus Host-related information within
Laboratory environments document of the publication the study
Haack et al. (2010) 40 ALB/CLB X International Review ALB–Lingafelter and Hoebeke (2002),
Williams et al. (2004), Wang (2004)z,
Wang et al. (2005), Yin and Lu (2005),
Haack (2006), Haack et al. (2006),
Hérard et al. (2006), CABI (2007),
APHIS (2008), Hérard et al. (2009),
Smith et al. (2009). CLB–Lingafelter
and Hoebeke (2002), Hérard et al.
(2006), CABI (2007)
Geib et al. (2009) 12 ALB X New York, U.S. Morewood et al. (2004a), Morewood
et a l. (2004b), Morewood et al. (2005)
Raupp et al. (2006) 21 ALB X North America Nowak et al. (2001), APHIS (2003),
APHIS (2005)
Dodds and Orwig (2011) 1 ALB X North America Hu et al. (2009), APHIS (2011)
Morewood et al. (2004b) 16 ALB X North America Haack et al. (1997), Nowak et al.
(2001), Ludwig et al. (2002), Smith
et al. (2002)
Haack et al. (1997) 73 ALB X North America Qin et al. (1985)z, Sun et al. (1990a)z,
Gao et al. (1993)z, He and Huang
(1993)z, Kucera (1996)
Williams et al. (2004) 11 ALB X South Korea Luo et al. (2003), Haack et al. (1997),
Wu and Chiang (1998)z
EPPO (2012) Web page ALB/CLB X Europe ALB–Li and Wu (1993)z
CLB–Gressitt (1951)
Ric et al. (2006) - ALB X Canada Lingafelter and Hoebeke (2002),
APHIS (2006)
CFIA (2012) Web page ALB X Canada 0
Yang (2005) - ALB X X China Sun et al. (1990b)z, Gao et al.
(1994)z, Sun (1995)z, Shao et al. (1997)z,
Guo (1998)z, Li et al. (1999)z, Wen
et al. (1999)z, Gao et al. (2002),
Liu et al. (2002)z, Li et al. (2003a)z,
Tian et al. (2003)z
Hérard et al. (2006) 17 ALB/CLB X X Europe 0
Jordbruksverket (2012) Web page ALB/CLB X Sweden 0
Mattilsynet (2012) Web page ALB/CLB X Norway 0
Natur Erhvervstyrelsen Web page ALB/CLB X Denmark Eppo (2012)
(2012)
Hérard et al. (2009) 5 ALB X X Italy Haack et al. (1996), Hérard et al.
(2006)
APHIS (2012) Web page ALB X North America Hu et al. (2009)
Ludwig et al. (2002) 7 ALB X North America Sawyer – personal communication
FAO (2007) - ALB X X China Lingafelter and Hoebeke (2002)
Yin and Lu (2005) - ALB X X China Zhou (1984)z, Qin (1985)z, Wang
et al. (1987)z, Li and Wu (1992)z,
Wang (1993)z, Zhang et al. (1995)z,
Gao (1998)z, Hu et al. (1998)z,
Cao et al. (2003)z, Li et al. (2003b)z,
Yang (2003)z, Zhang and Lu (2003)z
Morewood et al. (2003) 22 ALB X North America Haack et al. (1997), Nowak et al.
(2001), Ludwig et al. (2002), Smith
et al. (2002)
Smith et al. (2002) 35 ALB X North America Xiao (1992)z, Nowak et al. (2001)
Hajek and Kalb (2007) 5 ALB X North America Haack et al. (1997), APHIS (2005),
Morewood et al. (2005)
Netherlands Plant Web page CLB X Holland 0
Protection Service (2012)
Lingafelter and Hoebeke 0 CLB X X Japan/Taiwan Chang (1960), Ohga et al. (1995)
(2001)
Van der Gaag et al. (2010) 2 CLB X Europe Wang and Cheng (1984)z, Qi (1997)z,
Lingafelter and Hoebeke (2002),
CABI (2007), van der Gaag et al.
(2008), Vukadin and Hrasovec (2008),
Haack et al. (2010)
Arboriculture & Urban Forestry 40(3): May 2014
©2014 International Society of Arboriculture
163
Origin of the study
Source Citations Beetle Green House/ Natural Plantations Review Authority Geographical focus Host-related information within
Laboratory environments document of the publication the study
Haack et al. (2010) 40 ALB/CLB X International Review ALB–Lingafelter and Hoebeke (2002),
Williams et al. (2004), Wang (2004)z,
Wang et al. (2005), Yin and Lu (2005),
Haack (2006), Haack et al. (2006),
Hérard et al. (2006), CABI (2007),
APHIS (2008), Hérard et al. (2009),
Smith et al. (2009). CLB–Lingafelter
and Hoebeke (2002), Hérard et al.
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Geib et al. (2009) 12 ALB X New York, U.S. Morewood et al. (2004a), Morewood
et a l. (2004b), Morewood et al. (2005)
Raupp et al. (2006) 21 ALB X North America Nowak et al. (2001), APHIS (2003),
APHIS (2005)
Dodds and Orwig (2011) 1 ALB X North America Hu et al. (2009), APHIS (2011)
Morewood et al. (2004b) 16 ALB X North America Haack et al. (1997), Nowak et al.
(2001), Ludwig et al. (2002), Smith
et al. (2002)
Haack et al. (1997) 73 ALB X North America Qin et al. (1985)z, Sun et al. (1990a)z,
Gao et al. (1993)z, He and Huang
(1993)z, Kucera (1996)
Williams et al. (2004) 11 ALB X South Korea Luo et al. (2003), Haack et al. (1997),
Wu and Chiang (1998)z
EPPO (2012) Web page ALB/CLB X Europe ALB–Li and Wu (1993)z
CLB–Gressitt (1951)
Ric et al. (2006) - ALB X Canada Lingafelter and Hoebeke (2002),
APHIS (2006)
CFIA (2012) Web page ALB X Canada 0
Yang (2005) - ALB X X China Sun et al. (1990b)z, Gao et al.
(1994)z, Sun (1995)z, Shao et al. (1997)z,
Guo (1998)z, Li et al. (1999)z, Wen
et al. (1999)z, Gao et al. (2002),
Liu et al. (2002)z, Li et al. (2003a)z,
Tian et al. (2003)z
Hérard et al. (2006) 17 ALB/CLB X X Europe 0
Jordbruksverket (2012) Web page ALB/CLB X Sweden 0
Mattilsynet (2012) Web page ALB/CLB X Norway 0
Natur Erhvervstyrelsen Web page ALB/CLB X Denmark Eppo (2012)
(2012)
Hérard et al. (2009) 5 ALB X X Italy Haack et al. (1996), Hérard et al.
(2006)
APHIS (2012) Web page ALB X North America Hu et al. (2009)
Ludwig et al. (2002) 7 ALB X North America Sawyer – personal communication
FAO (2007) - ALB X X China Lingafelter and Hoebeke (2002)
Yin and Lu (2005) - ALB X X China Zhou (1984)z, Qin (1985)z, Wang
et al. (1987)z, Li and Wu (1992)z,
Wang (1993)z, Zhang et al. (1995)z,
Gao (1998)z, Hu et al. (1998)z,
Cao et al. (2003)z, Li et al. (2003b)z,
Yang (2003)z, Zhang and Lu (2003)z
Morewood et al. (2003) 22 ALB X North America Haack et al. (1997), Nowak et al.
(2001), Ludwig et al. (2002), Smith
et al. (2002)
Smith et al. (2002) 35 ALB X North America Xiao (1992)z, Nowak et al. (2001)
Hajek and Kalb (2007) 5 ALB X North America Haack et al. (1997), APHIS (2005),
Morewood et al. (2005)
Netherlands Plant Web page CLB X Holland 0
Protection Service (2012)
Lingafelter and Hoebeke 0 CLB X X Japan/Taiwan Chang (1960), Ohga et al. (1995)
(2001)
Van der Gaag et al. (2010) 2 CLB X Europe Wang and Cheng (1984)z, Qi (1997)z,
Lingafelter and Hoebeke (2002),
CABI (2007), van der Gaag et al.
(2008), Vukadin and Hrasovec (2008),
Haack et al. (2010)
SjÖman et al.: Host Trees for Wood-Boring Pests: An Urban Forest Perspective
©2014 International Society of Arboriculture
164
Origin of the study
Source Citations Beetle Green house/ Natural Plantations Review Authority Geographical focus Host-related information within
Laboratory environments document of the publication the study
Vukadin and Hrasovec 0 CLB Croatia Lingafelter and Hoebeke (2002)
(2008)
Van der Gaag et al. (2008) Web page CLB X X Europe (Holland) Lingafelter and Hoebeke (2002),
CABI (2007), EPPO (2006)
Adachi (1994) 16 CLB X Japan Kojima and Hayashi (1978)w
Lingafelter and Hoebeke Book ALB/CLB X International Review ALB–Chen and Wang (1935)z, Zhou
et al. (1981)z, Qin et al. (1985)z,
(2002) Sun et al. (1990a)z, Xiao
(1992)z, Gao et al. (1993)z, He and
Huang (1993)z, Yang et al. (1995)z,
Haack et al. (1996), Kucera (1996),
Haack et al. (1997), Cavey et al.
(1998), Wu and Chiang (1998)z
CLB–Clausen (1931), Kojima
(1931), Cheo (1935), Gressit (1940),
Gressit (1942), Gressit (1951), Lieu
(1945), Samuelson (1965), Duy
(1968), Kojima and Hyashi (1978),
Hua (1982)z, Kojima and Nakamura
(1986), Gao et al. (1993)z, Hua et
al. (1993)z, Wang et al. (1996), Wu
and Chiang (1998)z
... The species citrus longhorned beetle, Anoplophora chinensis (Forster, 1771) (Coleoptera: Cerambycidae), which is among the "Quarantine Pests Limited in Türkiye and Impeding Imports," is considered one of the most important quarantine pests worldwide (Sjöman et al., 2014;TOB, 2021;EPPO, 2023). In this study, taxonomy, morphology, distribution, host plants, life cycle, damage, control of A. chinensis have been given with notes on its current situation in Türkiye. ...
... and other forest and fruit trees. In China, it has been observed on over 100 plant species belonging to 29 genera in 19 families (Lim et al., 2014;Sjöman et al., 2014;Huang et al., 2019). Outside its native range, the species has been found on a broader range of hosts, with approximately 180 hosts belonging to 87 genera identified (Lim et al., 2014;Sjöman et al., 2014;Huang et al., 2019;Branco et al., 2022;EPPO, 2023). ...
... In China, it has been observed on over 100 plant species belonging to 29 genera in 19 families (Lim et al., 2014;Sjöman et al., 2014;Huang et al., 2019). Outside its native range, the species has been found on a broader range of hosts, with approximately 180 hosts belonging to 87 genera identified (Lim et al., 2014;Sjöman et al., 2014;Huang et al., 2019;Branco et al., 2022;EPPO, 2023). It has also been found on needle-leaved trees such as Pinus and Cryptomeria species (Lingafelter and Hoebeke, 2002). ...
Article
The citrus longhorned beetle Anoplophora chinensis (Forster, 1771) (Coleoptera: Cerambycidae), which is considered to be one of the most important pests in the world, is listed in the Plant Quarantine Regulation of Türkiye as a "quarantine pest whose presence in Türkiye is limited and which constitutes an obstacle to import". After this species was first detected in Istanbul in 2014, it was found in Antalya, Bartın, Diyarbakır, Sakarya and Trabzon. Anoplophora chinensis which was seen on many tree species, but it prefers generally Acer spp., Platanus orientalis and Corylus spp. in Türkiye. So far, the species has been observed in parks, nurseries and hazelnut production areas. Since it is a polyphagous species and its main host in its native distribution areas is citrus fruits, it is an important threat for ornamental plants and agricultural sectors. It may also pose a threat to broad-leaved species in forest areas in terms of biodiversity. In this study, the current situation of A. chinensis in Türkiye and in the world is discussed in detail.
... www.nature.com/scientificreports/ to the genera Acer and Populus as common host plants, and Prunus, Pyrus, and Malus (Rosaceae), including commercially important deciduous fruit trees such as plums, pears, and apples [1][2][3]18 . Among fruit trees, Malus is categorized as Category I: completion of the beetle's life cycle has been confirmed on two living trees of this genus in China, and also in a caged test in Austria 2,17,18 . ...
... www.nature.com/scientificreports/ to the genera Acer and Populus as common host plants, and Prunus, Pyrus, and Malus (Rosaceae), including commercially important deciduous fruit trees such as plums, pears, and apples [1][2][3]18 . Among fruit trees, Malus is categorized as Category I: completion of the beetle's life cycle has been confirmed on two living trees of this genus in China, and also in a caged test in Austria 2,17,18 . In Pyrus, only Chinese pear (Pyrus bretschneideri) is categorized as Category I; in other words, A. glabripennis has completed its life cycle in this plant species in the field. ...
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Invasive Anoplophora glabripennis recently became established in Japan and has caused heavy damage to several street-tree species. Overseas, A. glabripennis infests trees of the genera Acer and Populus as common host plants, and Malus, Pyrus, and Prunus (Rosaceae), including apple, pear, and plum trees; it therefore poses a potential risk to the production of economically valuable fruits in Japan. Fruit farms in areas already invaded by A. glabripennis are now threatened with tree infestation. We aimed to determine the potential damage to major fruit species in Japan. In the laboratory, we determined if the adult beetle is attracted to the odor of each of these tree species’ branches; two confirmed host plant species and five Rosaceae fruit species, as well as its feeding preferences among branches of one host plant and the five fruit trees and its oviposition preferences among them. Among the fruit species, cherry branch had the highest rate of odor orientation by males. The feeding-preference assay showed that, besides the host plant, Japanese pear was the most consumed among the fruit trees. The potential risk of A. glabripennis laying eggs on fruit-tree branches was high for Japanese pear and above zero for plum, apple, and cherry branches.
... Typically, species that feed in healthy trees tend to specialize on one or few host genera whereas those that feed in dead hosts tend to be polyphagous (Hanks 1999). But there are exceptions like Anoplophora chinensis (Forster) whose larvae can complete development in live healthy plants from at least 13 different genera (Sjöman et al. 2014). Even for polyphagous woodborers, there are differences among host species in terms of preference (by ovipositing females) and performance (survival and reproduction of offspring). ...
... Even for polyphagous woodborers, there are differences among host species in terms of preference (by ovipositing females) and performance (survival and reproduction of offspring). For example, A. glabripennis has been recorded from 24 tree genera (Sjöman et al. 2014) but extensive surveys of infestations in Toronto, Canada (Turgeon et al. 2016) and Chicago, USA found that Acer L. and Ulmus L. were clearly preferred to other tree species. Similarly, A. glabripennis has been recorded in seven genera in Northern Italy but 98% of infested trees belonged to only four genera (Acer, Ulmus, Salix, Betula) and both oviposition and larval survival was greatest on Acer (Faccoli and Favaro 2016). ...
Chapter
Full-text available
Woodborers are an ecologically important guild in forested ecosystems and include Buprestidae, Cerambycidae, and Siricidae. Members of these families contribute to various ecological processes including nutrient cycling and forest succession, and are also important components of food webs. Most woodborers encountered in forests are secondary species that rarely kill trees, however, important invasive species like Asian longhorned beetle, emerald ash borer, and Sirex noctilio can have broad ranging impacts on urban, managed, and natural forests. This chapter provides a broad overview of three woodborer families, including information on natural history, abiotic and biotic population regulation factors, ecological roles, chemical ecology, management, and a brief overview of economically important species.
... Larvae of Dioryctria rubella, the pine shoot moth, can tunnel and feed within branches, reducing the health of pine trees (Lapis 1987, Xu et al. 2021. These insect species were documented as having outbreaks in other regions (Sjöman et al. 2014, Hérard, Maspero 2019. ...
... Anoplophora chinensis and Batocera horsfieldi are both notorious for tunneling holes into trees and causing the death of living xylem (MacLeod et al. 2002, Straw et al. 2015, 2016. The former lays eggs near the trunk and roots of trees after which larvae bore into the wood and remain inside of trees until adulthood (Sjöman et al. 2014). The latter can attack Juglans regia Linn. ...
Article
Full-text available
Invasive insect wood borers are a threat to global forests and tree-related industries as they can damage trees and spread plant pathogens. Reports of damages by wood borers on plants that were planted overseas may facilitate the identification of potential invaders and speed up risk assessment. However, much of this information remains unavailable to the international plant protection community due to language barriers, lack of digitization, or limited circulation of regional literature. Here, we investigated reports of wood borers on 7 important North American commercial tree species planted in China (Carya illinoinensis, Liquidambar styraciflua, Pinus elliottii, Pinus taeda, Quercus texana, Quercus rubra, and Quercus virginiana) in peer-reviewed as well as "grey" (nonpeer-reviewed) Chinese literature. A total of 60 unique wood borer records were found, yielding reports of 4 orders, 39 genera, and 44 species of insect wood borers. Among Coleoptera, longhorned beetles (Cerambycidae) were the most commonly reported colonizers of North American trees in China. Chinese peer-reviewed reports of pests on alien plants are a valuable tool to survey for potential wood-boring invaders of North America, and wherever North American trees are planted and have the potential to encounter Asian invasive insects. Digitization and dissemination of non-English literature are essential for contemporary risk assessment. On the other hand, the nonpeer reviewed "grey" literature, primarily agency reports and student theses, provided only 5% of the records; many incidental observations were unreliable.
... From 1996 to 2021, 60 ALB establishments were detected outside the native range across 20 countries/regions (Fig. 3), including 5 establishments in Asia, 17 in North America, and 38 in Europe (Haack et al., 2010;Sjöman et al., 2014;Branco et al., 2021). As of December 2020, approximately half of all detected ALB establishments have been successfully eradicated worldwide (Fig. 3). ...
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The Asian longhorn beetle (ALB) Anoplophora glabripennis is one of the most successful and most feared invasive insect species worldwide. This review covers recent research concerning the distribution of and damage caused by ALB, as well as major efforts to control and manage ALB in China. The distribution and destruction range of ALB have continued to expand over the past decade worldwide, and the number of interceptions has remained high. Detection and monitoring methods for the early discovery of ALB have diversified, with advances in semiochemical research and using satellite remote sensing in China. Ecological control of ALB in China involves planting mixtures of preferred and resistant tree species, and this practice can prevent outbreaks. In addition, strategies for chemical and biological control of ALB have achieved promising results during the last decade in China, especially the development of insecticides targeting different stages of ALB, and applying Dastarcus helophoroides and Dendrocopos major as biocontrol agents. Finally, we analyze recommendations for ALB prevention and management strategies based on native range and invasive area research. This information will hopefully help some invaded areas where the target is containment of ALB.
... Many species are very colorful which made them appealing to the collectors . Some species are however, considered as pests Smith et al. 2001;Macleod et al. 2002;Williams et al. 2004;Bankroft, Smith 2005;Hu et al. 2009;Smith et al. 2009;Haack et al. 2013;Brabbs et al. 2015;Crook et al. 2014;Dhandapani et al. 2020;Hérard, Maspero 2019;Keena et al. 2021;Li et al. 2004;Nehme et al. 2013;Nehme et al. 2014;McKenna et al. 2016;Sjöman et al. 2014;Colombo, Limonta 2001;Tomiczek et al. 2002;Bencker et al. 2004;Hérard et al. 2005;Hérard et al. 2006;Maspero et al. 2007;Tomiczek et al. 2007;Benker et al. 2004;Benker, Bogel C. 2008;Sabbatini et al. 2012;Bazzoli, Alghisi 2013;, Ciampitti et al. 2013a, 2013bCopini et al. 2013;Favaro et al. 2013;Loomans et al. 2013;Maspero et al. 2013;Pluess 2013;Roselli et al. 2013;Sabbatini Peverieri et al. 2013;Vukadin A. 2013;Zampini et al. 2013;Pajovic et al. 2017), while some plays an integral part in thetropical rainforests. With this, many scientists around the world are working on developing new methods on how to detect these species and mitigate them effectively Hajek et al. 2007aHajek et al. , 2007bMankin et al. 2008;Yasuii et al. 2011;Hoyer-Tomiczek & Sauseng 2013;Strangi et al. 2013;Villa et al. 2013). ...
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This article provides new distribution records of the twenty seven species of the genus Anoplophora in Asia based on the beetle collection at the Coleopterological Research Center of Daugavpils University, Latvia. Anoplophora zonator (Thoms.) is recorded for the first time in Vietnam. In the Philippines, the following distribution records are newly set, A. tianaca (Schultze) in Negros island, A. sebastieni Duranton) in Luzon island, an additional data since its species description, and A. asuanga (Schultze) in Leyte and Samar islands.
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To achieve resilience goals, urban planners and decision-makers need accurate information on the benefits provided by urban trees and on the effects that management may have on them. This study investigates the impacts of management and disturbances on urban forest structure and function in Turku, Finland. Using a comprehensive urban tree database and the i-Tree software suite, we assessed the current structure and estimated the value of ecosystem services provided by Turku's urban forest. Additionally, we simulated changes in the urban forest over a 50-year period, considering different tree planting scenarios and the potential outbreak of the Asian longhorned beetle (ALB). Turku's urban forest comprised 38,438 public trees, dominated by Acer platanoides, Pinus sylvestris, Tilia × europaea , and Betula pendula . The estimated carbon storage was 12,336 t, valued at 1.98 million €, with an annual sequestration rate of 284 t (45,549 €/year). The trees also removed 8.97 t of pollutants annually, with an estimated value of 153,273 €. At the current rate of tree planting, the number of trees would decline over the course of 50 years resulting in a gradual decrease in the provision of ecosystem services. Although doubling the tree planting rate could slowly increase carbon storage and sequestration even under moderate ALB attack, it was insufficient to offset the damage caused by ALB if tree mortality rate reaches 50%. Compared to carbon storage and sequestration, changes in urban forest age structure had a more immediate impact on the removal of air pollution. These findings emphasize the importance of prioritizing investments in urban forests on grounds of their capacity to provide diverse ecosystem services. Incorporating these findings into decision-making processes would promote sustainable and resilient urban environments.
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In recent years, several invasive woodborers (Coleoptera: Cerambycidae) have been found in Japan. Aromia bungii is a worldwide important pest of fruits and ornamental species of the genus Prunus. It invaded Japan in the early 2010s and now causes heavy damage to stone fruit trees. Anoplophora glabripennis and Apriona swainsoni are destructive pests of street, ornamental and horticultural trees. The first step in intercepting these beetles is to detect their presence early in their infestation, as accurate identification is crucial for their management. Ejected frass is a major sign of infestation and likely holds information on the insect. We focused on chemicals in both larvae and frass, and conducted a GC–MS analysis of these three invasive beetles and the native Anoplophora malasiaca. In all four species, 4 or 5 species-specific hydrocarbons were detected in both larvae and frass. These results indicate that analysis of hydrocarbons in frass could allow definitive detection of invasive wood-boring pests.
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The Asian longicorn beetle Anoplophora glabripennis is a recently arrived invasive species to Japan. The Japanese native A. malasiaca shows an extensive overlap with A. glabripennis with host plants, niches, and emergence season. Hybridization between these two species is suspected in Japan. The surface of the female is covered with contact sex pheromones that elicit male mating behavior within species. We evaluated the contact pheromonal activity of crude extract and fractions of female A. glabripennis coated on a black glass model and revealed a hydrocarbon fraction and a blend of fractions to show activity but relatively weak, suggesting the presence of other unknown active compounds. Few male A. glabripennis showed mating behavior when they were exposed to a crude extract of female A. malasiaca. However, a considerable number of A. malasiaca males mounted and showed abdominal bending behavior when presented with glass models that were coated with each extract of female A. glabripennis and A. malasiaca. Gomadalactones are essential contact pheromone components that elicit mating behavior in male A. malasiaca; however, we could not detect them in female A. glabripennis extract. Here, we investigated the possible reasons for this phenomenon and the difference in male mate recognition systems between these two species.
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Velvet longhorned beetle Trichoferus campestris (Faldermann) (Coleoptera: Cerambycidae) is native to Asia. It is reported to be polyphagous in its native range, but hosts have not been screened in its introduced range in the United States. We conducted choice and no‐choice host experiments. For choice assays, gravid T. campestris oviposited freely on cut branches of four tree species: Juglans nigra, Malus domestica, Acer saccharum, and Pinus strobus. We investigated oviposition between apple branches with and without cankers. Half of the choice trials underwent winter temperatures. For no‐choice assays, eggs were placed on cut branches of these same four species. Half of these branches were later dissected to measure larval development. The rest were exposed to winter temperatures and T. campestris emergence was quantified. Overall, Trichoferus campestris oviposition and development occur more readily on J. nigra and M. domestica than on A. saccharum or P. strobus. The insect oviposited more on cankered than uncankered apple wood. Cold exposure during an overwintering period benefitted insect development in adults. The insect's high degree of polyphagy and ability to reproduce in dry wood has likely facilitated its establishment in multiple locales around the world.
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Fecundity of this longhorn beetle was influenced by the species of host trees infested. Orientation of the male beetle at long distance towards the female beetle was mediated by the secretion of sex pheromone of the latter. At close distance, however, the rush of the male beetle toward a female beetle was elicited by visual stimulus. -from English summary
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In 1989-1992, the research results showed that Anoplophora chinensis has one generation a year, but in the whole, about 15% of them has two generations in three years. Its damage degree is obviously correlated with the plant age, stand density and stand condition. The total accumulated temperature of 1200°C was needed in the period when after overwintering, the larva after recovering is changed into adults. Its emergence peak day (time) was obviously coincided with in full bloom day (time) of Casuarina equisetifolia in the stand. Through the investigation of 8263 sample trees and about 100 000 plants checked, a chance of 100% can be reached of its emergence hole distributed in 25 cm above the ovipositing slot. A mortality above 90% can be reached by daubing trunks at above the egg hole about at 25 cm with 40% omethoate in 1:4 time solution of kerosine and the technical points in the synthetical control were suggested.
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A description and assessment of elytral maculation and variation is provided for the following Anoplophora taxa in Japan and Taiwan: Anoplophora malasiaca (Thomson, 1865), A. malasiaca tokunoshimana Samuelson (1965), A. macularia (Thomson, 1865), A. oshimana (Fairmaire, 1895), A. oshimana ryukyensis Breuning and K. Ohbayashi (1964), and A. ogasawaraensis Makihara (1976). Elytral maculae are homologized and compared based on their position to each other and to other elytral features. Because considerable overlap in patterns of maculation occurs among members of the A. malasiaca/macularia complex, we conclude that elytral maculation alone should not be used to define these taxa.
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This chapter focuses on the plant materials being used in urban forestry. It intends to be an introduction to the choice of species and a guide to the identification of better plant materials for different urban situations. However, the chapter is not aiming at giving advanced guidelines for plant breeders, although some of the different methods of tree improvement are mentioned briefly. The methodology of tree improvement programs needs to reflect national and regional aims. The chapter also includes an overview of genotypic resistance to stresses, which trees need to withstand in urban situations. Those stresses are mainly dealt with elsewhere (Chap. 11). The status of tree selection is also illustrated by some European examples. In Europe the recent focus has been on the relationship between the location in which trees are planted and the relative resulting stresses, which they experience. Street trees are exposed to a relatively high stress level and the average lifespan of the trees is short. The stresses include different polluting agents, mechanical damage, high and low ambient temperatures, de-icing salt, restricted space for crown development, small root volumes, low quality growing substrates and insufficient access to water and oxygen to roots (see also Chap. 11). Street trees may also be negatively affected by shading, local wind gusts and the impact from recreational users of green areas. Park trees are exposed to moderate stress and the average lifespan of trees increases. However, the trees are often exposed to pollutants and to stresses from people and animals. Finally, trees in urban woodland are subjected to relatively low stress levels and may reach a considerable lifespan. In urban woodland, the level of stress depends more on climatic growing conditions, long distance air pollution, soil conditions, recreational patterns with increased fire risk and biotic damages (Sæbø et al. 2003). Today, urban forestry relies mainly on the selection and breeding efforts done in species of interest in conventional forestry. Plant materials, which have been selected for commercial forestry, can probably be used with some success in urban areas. However, for many of those species of interest to urban forestry, selection of improved trees, and related research, such as the mapping of the genetic structure of the species, has mostly not been carried out. Thus, there is a strong need to increase systematic work on selection and even breeding of trees and shrubs adapted to urban conditions, with the aim of finding genotypes that can easily be propagated, produced and established in urban green areas. This is especially the case if planners and practitioners are to succeed in increasing the range of species used in cities.
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White-spotted longicorn beetles, Anoplophora malasiaca (THOMSON), were reared in the laboratory under a varying temperature regime simulating both diel and seasonal fluctuations of natural temperatures, and at three constant temperatures of 20, 25 and 30°C. In the fluctuating-temperature regime, three groups which had different starting points of the seasonal fluctuation were examined to elucidate the effect of different oviposition times on the A. malasiaca life cycle. Small bolts of freshly cut citrus tree were used as food for the larvae. The photoperiod was constant darkness. With fluctuating temperatures, more than 70% of the larvae survived and required 1 or 2 years to complete their life cycle (from egg to adult eclosion). The proportion of individuals with a 2-year life cycle increased as the oviposition time was delayed. Most larvae spent a several-month period without feeding before pupation. Adults emerged simultaneously in June irrespective of their life cycle type. At 20°C, 57% of the individuals completed their development and emerged as adults during the period from 306 to 704 days after oviposition. At 25 and 30°C, all the individuals eventually died during the larval stage. Lower developmental threshold temperatures for eggs and young larvae were estimated to be 6.7 and 11.6°C, respectively.