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Disna Gunawardana

Disna Gunawardana
Ministry for Primary Industries,Auckland

PhD

About

36
Publications
4,611
Reads
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123
Citations
Additional affiliations
March 2001 - July 2015
Ministry for Primary Industries
Position
  • Senior Scientist (Entomology)

Publications

Publications (36)
Article
Full-text available
The bollworm, Helicoverpa armigera, is one of the most important agricultural pests in the world. Diagnosis of this species morphologically is difficult from the similar species H. assulta, H. punctigera and H. zea as the adults are identified based on genitalia morphology and larval identification is limited due to shared morphological characters....
Article
Full-text available
Background Brown marmorated stink bug (BMSB), Halyomorpha halys (Hemiptera: Pentatomidae) is native to East Asia but has invaded many countries in the world. BMSB is a polyphagous insect pest and causes significant economic losses to agriculture worldwide. Knowledge on the genetic diversity among BMSB populations is scarce but is essential to under...
Article
Full-text available
Background: In the past decade, the brown marmorated stink bug (BMSB), Halyomorpha halys (Hemiptera: Pentatomidae) has caused extensive damage to global agriculture. As a high-risk pest for many countries, including New Zealand, it is important to explore its genetic diversity to enhance our knowledge and devise management strategies for BMSB popu...
Preprint
Full-text available
Background: In the past decade, the brown marmorated stink bug (BMSB), Halyomorpha halys (Hemiptera: Pentatomidae) has caused extensive damage to global agriculture. As a high-risk pest for many countries, including New Zealand, it is important to explore its genetic diversity to enhance our knowledge on and devise management strategies for BMSB po...
Preprint
Full-text available
Background: In the past decade, the brown marmorated stink bug (BMSB), Halyomorpha halys (Hemiptera: Pentatomidae) has caused extensive damage to global agriculture. As a high-risk pest for many countries, including New Zealand, it is important to explore its genetic diversity to enhance our knowledge on and devise management strategies for BMSB po...
Preprint
Full-text available
Background: In the past decade, the brown marmorated stink bug (BMSB), Halyomorpha halys (Hemiptera: Pentatomidae) has caused extensive damage to global agriculture. As a high-risk pest for many countries, including New Zealand, it is important to explore its genetic diversity to enhance our knowledge on and devise management strategies for BMSB po...
Preprint
Full-text available
Background: In the past decade, the brown marmorated stink bug (BMSB), Halyomorpha halys (Hemiptera: Pentatomidae) has caused extensive damage to global agriculture. As a high-risk pest for many countries, including New Zealand, it is important to explore its genetic diversity to enhance our knowledge and devise management strategies for BMSB popul...
Article
Fruit flies cause significant damage to crop and fruit production worldwide. Therefore, it is essential to identify these organisms to species level; however, immature stages are often impossible to be identified morphologically; thus, the application of DNA barcoding has greatly assisted in species identification. Nuclear, mitochondrial pseudo‐COI...
Article
Full-text available
The first records of Tuberolachnus salignus (Gmelin), the giant willow aphid, were reported from New Zealand and Australia in December 2013 and March 2014 respectively. The host plants are various members of Salix and Populus. The pathway used by the aphid to enter Australasia remains unknown, but natural aerial dispersal across the Tasman Sea is p...
Article
Zeugodacus cucumis and Bactrocera jarvisi are pests of fruit and vegetable crops and cause damage to horticulture industries. Immature stages of these two fruit fly species have been intercepted in New Zealand a number of times. Identification to species was not possible using morphological characters; thus, it is important to develop an assay for...
Article
Full-text available
Immature fruit fly stages of the family Tephritidae are commonly intercepted on breadfruit from Pacific countries at the New Zealand border but are unable to be identified to the species level using morphological characters. Subsequent molecular identification showed that they belong to Bactrocera xanthodes , which is part of a species complex that...
Article
Full-text available
Stenchaetothrips martini sp.n. is distinguished from related species on morphological and molecular character states. It is the eleventh species in this genus to be recorded from a species of bamboo, but only the fourth of these 11 species to have a prominent spinula on the mesothoracic furca. Described here from New Zealand, this thrips is presuma...
Article
Full-text available
Morphological and molecular characters are provided for distinguishing two similar species of Frankliniella that are commonly found by quarantine authorities in international shipments of horticultural produce, particularly from Colombia where panamensis and occidentalis co-exist in greenhouses.
Article
Although Drosophilidae and associated hymenopterous parasitoids have been the subject of much field and laboratory ecology in many parts of the world, the system has been relatively neglected in New Zealand. This study investigated the seasonality of Drosophila, Scaptodrosophila and associated hymenopterous parasitoids in Canterbury by using traps...
Article
Full-text available
A large population of Paropsisterna beata (eucalyptus leaf beetle) was detected on Eucalyptus nitens (H. Deane & Maiden) Maiden (Myrtaceae) at Whitemans Valley, a suburb east of Upper Hutt, Wellington, in 2012. The suburb is a semi-rural residential area with a large number of eucalypt, planted for amenity, shelterbelt and firewood. Surveillance to...
Article
The glassy-winged sharpshooter ( Homalodisca vitripennis ) is an invasive pest organism, which is found throughout Central America and has recently invaded a few countries in the Pacific Islands. As a carrier of the highly virulent plant pathogenic bacterium Xylella fastidiosa , it is of great economic significance to horticulture and is estimated...
Article
Full-text available
The genus Kalasiris Henderson & Hodgson (Hemiptera: Sternorrhyncha: Coccomorpha: Coccidae) is currently only known from New Zealand. The adult female and pupa of a new species, K. martini Hodgson & Richmond are described and illustrated below and the possible taxonomic relationships of the genus to other New Zealand genera are discussed.
Article
Full-text available
Significant plant pests such as fruit flies that travel with fresh produce between countries as eggs or larvae pose a great economic threat to the agriculture and fruit industry worldwide. Time-limited and expensive quarantine decisions require accurate identification of such pests. Immature stages are often impossible to identify, making them a se...
Article
Full-text available
Spider mites of the genus Tetranychus are difficult to identify due to their limited diagnostic characters. Many of them are morphologically similar and males are needed for species-level identification. Tetranychus urticae is a common interception and non-regulated pest at New Zealand's borders, however, most of the intercepted specimens are femal...
Article
Over the last 10 years the National Invasive Ant Surveillance programme, which was established in 2003 by the Ministry of Agriculture and Forestry (now Ministry for Primary Industries) in New Zealand, has resulted in a number of exotic ant detections at the Napier sea port and surrounding facilities. The surveillance is designed to detect newly est...
Article
In February 2010 caterpillars initially identified as a species of Philobota (Lepidoptera Oecophoridae) were found in a nursery area at Ruakura Research Centre in Hamilton The identification was confirmed by MAFs Plant Health and Environment Laboratory (PHEL) This genus is endemic to Australia where over 400 species are known a few of which are reg...
Article
Full-text available
https://journal.nzpps.org/index.php/nzpp/article/view/4563/4391 Poster Abstract OCCURRENCE AND DIVERSITY OF PESTS FOUND IN ASSOCIATION WITH IMPORTED USED VEHICLESM.F.S.W. FERNANDO, M.S. BULLIANS, H.G. PEARSON, C.A. MUIR,D. VOICE, B.J.T. MCCARTHY and D. GUNAWARDANAMinistry of Agriculture and Forestry, PO Box 2095, Auckland, New ZealandCorrespondin...
Article
Nach Behandlung mit Bu-Li kann das aus dem Diazabicyclooctan (Ia) entstandene Methylderivat (Ib) an dem Br?ckenkopfatom deuteriert bzw. zu (Ic) alkyliert werden.
Article
2,5-Dimethyl-2,5 diazabicyclo[2,2,2]octane-3,6-dione can be lithiated at the 1,4 (bridgehead) positions with 2 equiv. of t-butyllithium at -78º and deuterated with D2O (Do, 11.2; Dl, 56.1 ; D2, 30.1%). With butyllithium and methyl iodide the 1,2,5-trimethyl and 1,2,4,5-tetramethyl derivatives are obtained. Treatment of dimethyl 2,6-diaminoheptanedi...
Article
Full-text available
Between 2002 and 2005, a large number of post border detections of invasive exotic ant species were discovered at the Container Repairs & Storage (CRS) facility in Mount Maunganui, New Zealand. Sea containers originating from the Pacific Islands are considered the likely pathway of entry to New Zealand. Ants had spread from the sea containers and e...

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