D. Dujesiefken

Institut für Baumpflege / Institute of Arboriculture

This book teaches the following topics competently and clearly and, above all, in a practice-oriented manner: Tree biology, wound reactions of trees, The CODIT principle, Wound reactions and CODIT principle in bamboo and palms, Conclusions for tree care, Time of wounding, the Hamburg Tree Pruning System and Implementation of tree care work in pract...

This book conprises the contents of the lectures of the German Tree Care Conference 2022 (Deutsche Baumpflegtage, Augsburg). The topice of the main chapters are: Street Trees and Avenues - Management and Preservation, Drought Stress and Tree Diseases, Root Zone and Tree Inspection.

On February 24, 2023, Prof. Dr. Dr. h.c. mult. Walter Liese died at the age of 97. As forest scientist he pioneered tree biology-oriented tree care. Through his death, research has lost an outstanding, globally respected scientist and colleague.

The book contains the contents of the lectures on the German Tree Care Conference (Deutsche Baumpflegetage) 2023 in Augsburg. The main chapters are: Research for trees, Songe city - Trees and Water, Tree management and short scientific communications.

On the occasion of the 40th anniversary of the Tree Care Days in Osnabrück, this article reviews the history of this conference and the development of research for tree biology-oriented tree care over the last four decades.

The RAS-LP 4 is the German guideline for road construction and landscape design with the focus "Protection of Trees, Vegetation and Animals during Construction". The guidelines came out in 1999 and combines practical experience of many years with scientific findings.

In this survey, the surface callus formation on artifical bark wounds of four conifer species and three deciduous tree species was examined. On wounds of conifers tissue similar to surface callus of deciduous trees was observed, but it always developed under residual phloem parts.

Es handelt sich um einen deutschsprachigen Leitfaden, der sich an den FLL-Baumkontrollrichtlinien orientiert und praktische Hilfestellung für die tägliche Arbeit gibt. Das Werk beinhaltet die rechtlichen Grundlagen zur Baumkontrolle. Ein weiteres Kapitel stellt die baumbiologischen Grundlagen dar. Außerdem gibt es eine mit Bildern illustrierte Chec...

Altogether 27 trees of Acer, Alnus,Prunus, Quercus, Ulmus, and Salix werde wounded by debarking areas of 10cm and 10cm in size. Wound treatment by placing a black, opaque polyethylen plastic wrap onto the fresh wound resulted in larger surface portions developing surface callus tissue than the application of the wound dressings Tervanol, Topsin and...

Dieses Buchkapitel befasst sich mit der Anatomie und Chemie des Fichtenholzes, den physikalisch-technologischen Eigenschaften, der Dauerhaftigkeit, den Schädlingen dem Schutz des Fichtenholzes. Weiterhin enthält dieses Kapitel Informationen über das Ast- und Wurzelholz, die Fichtenrinde, Gütemerkmale, Sortierung sowie zur Verwendung des Fichtenholz...

Um das Jahr 2000 sind in der Stadt Karlsruhe verstärkt streifenförmige Nekrosen am Stamm von Jungbäumen aufgetreten. Es handelt sich meist um Schäden auf der Südwest-Seite des Stammes, vor allem an Ahorn, Linde und Rosskastanie. Die Untersuchung zeigt die Notwendigkeit für einen Stammschutz zur Verhinderung dieser Sonnennekrosen.

In recent years, root and butt decay in Black Locust (Robinia pseudoacacia L.) has been observed in several German cities, Ieading to mechanical failure even in young trees.The polyporous fungus Perenniporia fraxinea (Fr.) Ryv., which causes a white rot in heartwood, sapwood and woody roots, is responsible for the damage.

Für den Baumschutz auf Baustellen ist in Deutschland das entscheidende Regelwerk die RAS-LP 4 (Richtlinie für die Anlage von Straßen, Teil: Landschaftspflege, Abschnitt 4: Schutz von Bäumen, Vegetationsbeständen und Tieren bei Baumaßnahmen). Der Artikel beschreibt die wesentlichen Änderungen zu der Vorgängerversion und erläutert die Möglichkeiten z...

Der Beitrag zeigt auf, dass es möglich ist, Baumwurzeln anhand der Strukturmerkmale von Holz und Rinde bis zur Gattung sicher zu bestimmen.

Straßenbäuine werden durch Baumaßnahmen häufig geschädigt. Die Folgen zeigen sich oftmals erst nach Jahren als deutliche Kronenverlichtung oder Fäulnis an den Wunden. Für den Schutz von Bäumen gibt es verschiedene Fachnormen und Regelwerke, die darin enthaltenen Schutzmaßnahmen sind jedoch unterschiedlich wirksam und werden in dieser Arbeit aus hol...

Straßenbäuine werden durch Baumaßnahmen häufig geschädigt. Die Folgen zeigen sich oftmals erst nach Jahren als deutliche Kronenverlichtung oder Fäulnis an den Wunden. Für den Schutz von Bäumen gibt es verschiedene Fachnormen und Regelwerke, die darin enthaltenen Schutzmaßnahmen sind jedoch unterschiedlich wirksam und werden in dieser Arbeit aus hol...

Dieser Artikel erläutert die Hamburger Schnittmethode, d. h. er befasst sich mit der optimalen Schnittführung beim Kronenschnitt in der Baumpflege

Dieser Beitrag beinhaltet die Erfahrungen der für die Stadt Hamburg entwickelte Vorgehensweise bei der Baumkontrolle zur Verkehrssicherheit: die Hamburger Baumkontrolle.

Dieses Jahrbuch der Baumpflege enthält 31 Fachartikel zu den Themenschwerpunkten: 1. Baumschutz, speziell zu Bäumen auf Deichen nund Dämmen 2. Vitalitätsbeurteilung von Bäumen sowie Baumpflege 3. Baumanagement sowie wissenschaftliche Kurzberichte und Adressen von Verbänden und Forschungseinrichtungen

Das Buch befasst sich speziell mit dem potenziellen Konfliktfeld Artenschutz und Baumpflege. Erstmals werden von einem Autorenteam aus verschiedenen Disziplinen für alle Beteiligte rechtliche und fachliche Grundlagen und Hintergründe erarbeitet.

The perfect time for pruning trees is frequently the topic in recent discussions. Some tree care professionals use expert knowledge and findings of research from forestry and pomiculture, other take the wound reaction of trees as a basis for decision-making or take legal aspects regarding protetion of species and road safety into consideration. Thi...

This book contains 28 articles about nature conservation and tree care, tree inspection and tree management of urban trees. It is a comprehensive reference book with a complete list of authors and keywords of all 22 yearbooks since 1997.

This book aims to stimulate connections and communication between disciplines, to encourage integrated approaches to study and practice and to build upon shared knowledge. Considering the tree over its lifespan and looking more deeply at the ancient phase, a better understanding of the ageing process helps to illuminate the way tree respond to dama...

This book aims to stimulate connections and communication between disciplines, to encourage integrated approaches to study and practice and to built upon shared knowledge. Considering the tree over its lifespan and looking more deeply at the ancient phase, a better understanding of the aging process helps to illuminate the way tree respond to damag...

The yearbook of arboriculture contains 32 articles about tree care, tree inspection and climate change and is a comprehensive reference source for arborists. The book is written in German and has English summaries.

The yearbook of arboriculture contains 29 articles about road side trees, tree inspection, diseases and is a comprehensive reference source for arborists. The book is written in German and has English summaries

Branches of Platanus × hispanica with distinct symptoms of the Massaria disease were investigated by light and transmission electron microscopy and cellular UVmicrospectrophotometry. The samples collected in the city of Mannheim, Germany, were infected in vivo with the fungus Splanchnonema platani and showed various degrees of wood decay. The inves...

A so far unknown disease which is found on red flowering horse chestnut (Aesculus × carnea Hayne) in the north-west of Germany has been investigated. It is characterized by the presence of fruiting bodies of Flammulina velutipes (Curtis) Singer and Pleurotus ostreatus (Jacq. ex Fr.) Kummer, able to cause breakage of branches and stems by white rot....

Poplar trees are fast growing trees which are mainly used for pulp production, plywood as well as MDF, OSB and particleboards. Its stem wood was therefore well analyzed for its anatomical and histometrical details. However, poplar branch wood attracted minor attention and there are much less details available on the anatomy. The present paper deals...

Etwa fünfjährige Bäume von Aesculus hippocastanum L. wurden gepflanzt und mit dem Bakterium Pseudomonas syringae pv. aesculi, dem Erreger der Pseudomonas-Rindenkrankheit der Rosskastanien infiziert. Zum Erkennen möglicher Eindringwege des Pathovars in den Baum wurden die Bäume mit einer Bakteriensuspension vollständig besprüht bzw. der Wurzelteller...

Trees of about 5 years age of Aesculus hippocastanum L. were planted and infected with Pseudomonas syringae pv. aesculi, the causal agent of the Pseudomonas bark disease of horse chestnut trees. To get knowledge on the infection ways of the pathovar, trees were treated by complete spraying or by watering the root area with bacterial suspensions. In...

Genetic analysis enables individual identifications of trees and shrubs, the development of methods to trace back plant material in the case of false labelling or investigation of damages caused by roots of trees. This individual genetic “barcodingprocedure” is performed by using the so called M13-fingerprinting method. A further technique is highl...

Trees are valuable for urban areas, however, are also susceptible to wood rot fungi. For accurate and fast assessment of the severity and evolution of decay in standing trees, a molecular technique was used to identify the causal agents of wood rot. Fruit bodies of wood decay fungi were collected from infected trees in various stands in Germany. Th...

Urban trees are valuable e. g. for the population and the climate in urban areas. However, they are susceptible to rot fungi. For an assessment of the rot development and of possible hazards, a molecular technique was used to identify the causal agents of wood rot in urban trees. Fruit bodies of wood decay fungi were sampled from infected trees. Th...

SummaryA molecular technique was used to detect the bacterium Pseudomonas syringae pv. aesculi in horse chestnut trees (Aesculus hippocastanum), affected by the recently recognized European ‘Pseudomonas horse chestnut bark disease’. The technique helped identify the pathogen within 6 h of sample preparation including DNA extraction, polymerase chai...

Bacteria were isolated from necrotic lesions on a horse chestnut tree (Aesculus hippocastanum) with bleeding canker in Hamburg, Germany. Sequencing of the rDNA-ITS region revealed great similarity to pathovars of Pseudomonas syringae. Pseudomonas syringae pv. aesculi was identified by sequence homology of the gyrase B gene. This is the first report...

Tree care, especially pruning, is still mostly done in the dormant time. Such treatments expose live inner bark, the vascular cambium, and functioning outer sapwood to harsh external influences followed often by infection of pathogens. Investigations about response reactions of beech and oak to wounding made in different times of the year showed th...

Arboriculture (from the Latin arbor = tree, cultura = tending or caring) is tree cultivation based on tree biology. The term arboriculture is often loosely used and includes the care of other woody plants such as vines (in the United States), wall shrubs (in England), and climbing shrubs (in Australia). This relatively young discipline generally fo...

Trees in urban areas are pruned for several reasons. Each pruning cut causes a wound, which leads at least in the exposed wood at the wound surface to discoloration and decay. The extension of the resulting defect depends on wound diameter, tree species, time of wounding, wound treatment, and last but not least the attachment of the branch to the s...

Wounding of trees by debarking during the vegetative period sometimes results in the formation of callus tissue which develops over the entire wound surface or on parts of it. This light and transmission electron microscopy study of living lime trees found that the formation of such a surface callus is subdivided into three stages. During the first...

Eine bislang wenig beobachtete Wundreaktion von Bäumen ist die Bildung eines Flächenkallus auf dem freigelegten Holzkörper. Unterhalb dieses Wundgewebes entsteht weder eine Verfärbung noch eine Fäule im Holz. Die Literatur der letzten ca. 250 Jahre sowie die ersten Ergebnisse aus eigenen Untersuchungen an künstlich angelegten Stammwunden an fünf ve...

Callus growth on the wound surface is a rarely observed wound response of trees where bark has been removed down to the xylem. Beneath this wound tissue no discoloration nor decay develop. An overview of the literature of the past 250 years is given, and the preliminary results of own investigations on artificial wounds of five tree species are pre...

Breaking-off of crown parts and large branches is a common type of tree failure and can result in substantial damage to objects and persons. The trees are often irrevers- ibly damaged as well. Reasons for this type of failure are usually included bark in forks and decay or cracks in branches. As an alternative to topping or felling hazard trees, a...

Boreholes are made in trees for different reasons, for example, to examine street trees to ensure public safety (Mattheck and Breloer 1994) or in the forest to determine age and growth of trees (Eckstein 1985). The effects of such holes in forest trees have been studied as early as the 1930s and 1940s (Meyer and Heyward 1936; Lorenz 1944; Hepting e...

The wound reactions of large-leafed and small-leafed lime (Tilia platyphyllos Scop. andT. cordata Mill.) and horsechestnut (Aesculus hippocastanum L.), tree species with different compartmentalization capacities, were examined nine/ten years after pruning. Pruning cuts, where the branch collar remained, in all trees exhibited more callus growth, le...

The wound reactions of large-leafed and small-leafed time (Tilia platyphyllos Scop. and T. cordata Mill.) and horsechestnut (Aesculus hippocastanum L.), tree species with different compartmentalization capacities, were examined nine/ten years after pruning. Pruning cuts, where the branch collar remained, in all trees exhibited more callus growth, l...

Tree species differ in their capability to compartmentalise uounds caused by increment borings. Closing such boreholes with a wound dressing has scarcely any effect. However, tbe season of the boring plays a role, at least in deciduous trees.

About the influence of time of wounding to the effectiveness of wound dressings exist only some informations. For that reason wood biological investigations were undertaken on three different deciduous tree species (maple, lime and plane). Two wounds were set to the stem in August and November, whereby one was treated with a wound dressing (Tervano...

In der Baumpflege und im Forst werden Maßnahmen wie Astungen oder Korntrollbohrungen meist während der Vegetationsruhe durchgeführt. Um den Einfluß der Verletzungszeit zu bestimmen, erfolgten an insgesamt 30 Bäumen (Alhorn, Birke, Buche, Eiche und Esche sowie der Fichte) Verletzungen mit einem Bohrer zu fünf Zeiten von Ende August 1988 bis April 19...

Zusammenfassung Hohle Bäume werden in der Baumpflege häufig ausgefräst und anschließend mit einem Wundverschluß-oder Holzschutzmittel eigenstrichen. Als Alternative hierzu wurden die Einsatzmöglichkeiten eines zweikomponentigen Polyurethans zur Wundbehandlung untersucht. Hierfür wurden an 43 älteren Laub- und Nadelbäumen Höhlungen gefräst und nach...

Der Einfluß der Verletzungszeit wurde an 20 Parkbuchen untersucht, die zu Beginn der Monate Oktober, Dezember, Februar und April mit einem Bohrer verletzt wurden. Bewertet wurden die Wundreaktionekn, auch im Vergleich zu Kronenzustand, elektrischen Widerstand im Kambialbereich, Holzfeuchte und Jahrringbeite, Je nach Verletzungszeit unterscheiden si...

Zusammenfassung Nach Verletzung mit einem Bohrer zeigt Birke ausgedehnte Verfärbungen von bis zu 1 m Länge, während Linde und vor allem Buche auf engem Raum kompartimentieren. Die licht- und elektronenmikroskopisch erkennbaren Wundreaktionen in Verfärbung und Grenzschicht werden vergleichend dargestellt. Die Befunde stehen im Einklang mit dem Modif...

In the field of tree care and tree surgery, considerable uncertainties exist regarding the best way of the cutting of branches. Wood-biological investigations were undertaken on 38 pruning wounds on lime trees of urban roadside stands. The artificial wounds were caused in different ways during the last 10 years, either by cutting the branch close t...

Mondringe werden ausgelöst durch Astabbrüche während strenger Frosteperioden. Der Jahrring nach dem Schadereignis zeigt im Frühholz nahe den Stümpfen abgebrochener Äste tendenziell Eigenschaften eines Wundgewebes. In der Mondring-Zone sind vor allem zwei Entwicklungsschritte der Verkernung gestört worden: Es wurden kaum Thyllen und nur in geringem...

The moon ring in oak heartwood appears on a cross section as a light-coloured circular zone. Due to this colour-change the value of the timber is reduced. Moon rings are only known for deciduous oak species in Central Europe, predominantly withQuercus petraea and to a lesser extent withQ. robur. Although moon rings occur only in about 1% of the oak...

A special type of discolouration in oak heartwood consists of 'included sapwood', also ca1-led moon-ring, which originates in the living tree. The economic importance of this wood defect and its occurrence, frequency and distribution in Germany are described. Within the tree this bright zone may be present throughout the whole stern but not in root...

For urban trees, water stress is often a problem, and their life span can be short. Therefore, there is a need for more information about the water use of such trees. For this study, bare-rooted Tilia cordata 'Greenspire' with stem circumferences of approximately 10 to13 cm (4 to 5 in) were planted in containers. In spring 2008, the trees were plac...