Beitrag zur Beurteilung einzelner schwerwiegender Probleme der Fichtenrotfäule

Simulating the extent of decay caused by Heterobasidion annosum s. l. in stems of Norway spruce

“…The rot simulation with RAM predicted plausible decay dimensions which were within the typical magnitudes published by several authors in Germany (Kató, 1967;Werner, 1971;Rehfuess, 1969;von Pechmann et al, 1973).…”

“…The heavily decayed zone, with a decay class of III, has reached up to nearly 7 m. Again the results reflect the two phases of the treepathogen interaction. The dimensions of rot compare well to the maximum values of Kató (1967) or Werner (1971).…”

“…We simulate the degree of decay as a function of rot diameter according the results of Kató (1967). The original function of Kató was transformed from the continuous to a discrete form with the classification according to the defined four decay classes.…”

“…The latter research line produced many relevant findings and is the basis for further quantitative estimation of losses by H. annosum. Important authors to mention in this context are, for example, Arvidson (1954), Kató (1967), Zycha (1967a,b), Zycha et al (1970), Werner (1971), Rehfuess (1969, 1973), von Pechmann et al (1973, Kallio and Tamminen (1974), Pratt (1979), Dimitri (1980), Johann (1988.…”

Befall der Fichte (Picea abies) durchHeterobasidion annosum in Abhängigkeit vom Baumalter

“…seiner einzelnen Organe (GAu-MANN 1951). Die Ergebnisseder vorliegenden Untersuchung widerlegen die Ansieht von KATO (1967), dafi der flir eine H. annosum-lnfekuon entseheidende Altersbereich zwischen 1 und 20 Jahren liegt. Sie bestatigen im Prinzip die Befunde anderer Autoren, die unter nattirhchen Bedingungen im Stamm junger Fiehten (<20 Jahre) einen Befall durch H. annosum nicht feststellen konnten (DiMlTRl 1969;WERNER 1973;TsANOVA 1974).…”