Einige Pilzschäden an alten Eichen

Autor: H. v. Aufsess
Rok vydání: 1973
Předmět:
Zdroj: Forstwissenschaftliches Centralblatt. 92
ISSN: 1439-0337
0015-8003
DOI: 10.1007/bf02736045
Popis: Every year a great many valuable veneer oaks are damaged by fungal diseases as a result of their great age. The most important oakwood destroying fungi were isolated and identified and their decay activity was tested in the laboratory. White rots in oak are mostly caused byStereum frustulosum, Stereum gausapatum, Hymenochaete rubiginosa, Polyporus dryophilus orFomes robustus. The brown rot fungusPolyporus sulphureus is responsible for the so-called red rot.Fistulina hepatica produces in the heartwood of oaks an intensive redbrown discolouration, but does not injure the density and strength properties of the wood considerably; this timber defect is designated asbrown oak. In contrast toFistulina hepatica some of the other abovementioned species (for examplePolyporus dryophilus, Fomes robustus andPolyporus sulphureus) decay the infected wood rather quickly. The microscopical feature of the attacked wood nearly always shows an accumulative appearance of dark inclusions in the parenchymatous tissue as well as in the fibres and tracheids. The enzyme activity of the different species varies somewhat, in the early stage of attack an influence can sometimes be observed only immediately around the hyphae and in other cases it quickly spreads over the whole cellwall diameter. The decomposition of the lignin component in the cellwalls begins soon after infection as can be shown by staining slides with astrablue. However the early stage of fungal attack, which can generally be observed in red rotten or red striped softwood after fluorochromation with acridin-orange, is scarcely or not at all developed in oakwood.
Databáze: OpenAIRE
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