Fungal Strategies of Wood Decay in Trees

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Springer Science & Business Media, 2000 - Technology & Engineering - 185 pages
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Wood-destroying fungi play an important role in nature, because they are the only forms of life capable of reducing wood to its initial constituents. However, they can also be dangerous for people and property, as they can impair the stability and fracture-safety of trees. This book gives detailed information, based on new and original scientific findings, on the examination and effects of the most important species of fungi associated with failure of infected urban trees. In addition, new ways are presented for predicting the advance of decay in the living tree. The subject is illustrated and made easily accessible by numerous colored photos of fungus fruit bodies, defect symptoms, and macroscopic and microscopic pictures of wood decay. A detailed introduction to the fundamentals of wood pathology provides a way into the subjects of applied mycology and tree-care for readers without previous special knowledge.

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In 1878, in Germany, as I learned in Forestry 101, the modern science of tree care was born with the publication of Robert Hartig’s text on tree disease. This landmark book described the parasitic mode of life of Armillaria on Scots pine and documented the breakdown of cell walls by Phellinus pini. In 1863, Schacht had described the invasion of cell walls by fungal hyphae. Lacking the tools necessary for a closer analysis, but building on Schacht’s work, Hartig postulated that enzymes secreted by fungal hyphae dissolved lignin and caused secondary cell walls to collapse. As a result, wood would become worthless, and trees would fall down.
In 2000, in Germany, the science of tree care took a great leap forward. Building on the work of Hartig, Shigo and many others, Francis W.F.M.R. Schwarze, Julia Engels and Claus Mattheck published Fungal Strategies of Wood Decay in Trees. Now available worldwide, and made readily accessible to English speakers thanks to the superlative translation work of William Linnard, this book shows the reader an entirely new way of looking at decay in trees. By understanding fungus-tree interaction more completely, the tree manager can make decisions about how to handle infected trees with more certainty.
More certainty is certainly needed today. Many authorities tell tree managers that infections by Armillaria, Ganoderma, Inonotus and other fungi are considered sufficient cause for immediate removal of the tree for fear of failure. However, based on over ten years of research, Schwarze tells us “…the mere occurrence of a fungus fruit body on a tree does not indicate the extent of the decay…Degradation processes, host differences and environmental conditions are too diverse…decays often affect only a small amount of wood in the tree, so that stability and safety are not impaired.”
The book begins with a review of wood anatomy, focusing on the layered structure of the cell wall. Readers of Mattheck’s earlier work will recognize the hedgehog demonstrating the mechanical stresses within the tree. By listening to this “body language” spoken inside the tree, the diagnostician may “hear” the decay spread--and sometimes stop. With magnification up to 1000x, the reader is able to see clearly the action of the fungus in the cells, and the reaction of the trees to the attack.
Fungal pathology is reviewed next; the brown, white and soft rots. Much advanced information on soft rots, which were first described by Schacht in 1863, is presented. For instance, research by Schwarze et al prove what Sinclair, Lyon and Johnson saw indications of in 1987—that Hypoxylon deustum (a.k.a. Ustulina deusta) causes a soft rot in the sapwood of various trees. This is just one example of a pathogen shifting strategies, from saprophyte to parasite, or from enzyme-secreting to hyphae-growing that the authors note, especially on moisture-stressed trees.
Chapter Three, the heart of the book, is devoted to Fungus-Host Combinations. For a diagnostician of limited understanding, such as the reviewer, the illustrations here tell the tale of fungal pathology better than a thousand words. First, electron micrographs take the eye into intercellular and intracellular space, where the chemical battles take place. Then, three-dimensional anatomic drawings paint a distinct picture of the disease and the defense. Finally photographs, of standing trees and cross-sections, show what we all see in real life when a rotting tree is cut down and cut up.
By pulling the eye and the mind from the inside of the tree to the outside and back again, the book allows the reader to exhaustively examine what takes place when fungus and tree combine. Still, as Schwarze says, “it requires an effort to understand these…’trials of strength’…the only sensible approach to predicting the future expansion of a decay…” Or termination of a decay process; for he and others have observed, “many trees, old and young, in which a decay has been successfully compartmentalized”. The


Examination Importance
Contents XV

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Page 178 - The fine structure of the fibres of normal and tension wood in beech (Fagus Sylvatica L.) as revealed by X-rays.
Page 176 - Production of hydrogen peroxide by wood-rotting fungi in wood and its correlation with weight loss, depolymerization and pH changes. Arch. Microbiol.
Page 177 - Nilsson, T. 1973. Studies on wood degradation and cellulolytic activity of microfungi.
Page 171 - ... their toxicity against fungi and bacteria. Holzforschung 31, 1-7 BAUCH, J., P. KLEIN, A. FRUHWALD, & H. BRILL, 1979: Alterations of wood characteristics in Abies alba Mill, due to "fir-dying" and considerations concerning its origin. Eur. J. For. Pathol. 9, 321-331 BAUCH, J., AL SHIGO & M. STARCK, 1980: Wound effects in the xylem of Acer and Betula species. Holzforschung 34, 153-160 BAUCH, J., H. GOTTSCHE-KUHN & P. RADEMACHER, 1986: Anatomische Untersuchungen am Holz von gesunden und kranken...
Page 177 - Pearce, RB (1990). Occurrence of decay-associated xylem suberization in a range of woody species.
Page 177 - W 1985 Electron microscopic demonstration of a suberised layer in the tylosis wall of beech and oak. IAWA Bull...
Page 174 - DE, and HM Craig. 1976. Factors influencing infection and initiation of decay by the Indian paint fungus (Echinodontium tinctorium) in western hemlock. Canadian Journal of Forest Research 6:299-318.
Page 177 - Holloway PJ 1984 Suberin in the sapwood of oak (Quercus robur L.): its composition from a compartmentalization barrier and its occurrence in tyloses in undecayed wood. Physiol Plant Pathol...
Page 171 - ... structural and chemical components of wood delignified by fungi. Wood Sci. Technol. 19, 35-46 BLANCHETTE, RA, L. OTJEN & MC CARLSON, 1987: Lignin distribution in cell walls of birch wood decayed by white rot basidiomycetes. Phytopathology 77, 684-690 BLANCHETTE, RA, JR OBST, JI HEDGES & K. WELIKY, 1988: Resistance of hardwood vessels to degradation by white rot basidiomycetes. Can. J. Bot. 66, 1841-1847 BLANCHETTE, RA, AR ABAD, RL FARRELL & TD LEATHERS, 1989a: Detection of lignin peroxidase and...
Page 177 - Bat., 33, 144-158, 235-254. PEACE, TR (1938). Butt Rot of Conifers in Great Britain. Quart. J. For., 32, 81-104. PERCTVAL, WC (1933). A Contribution to the Biology of Fames pini (Thore) Lloyd. Tech. Publ. Jf.T. St. Coll. For, No. 40. REA, C. (1927). Appendix to "British Basidiomycetae.

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