Intensity of wood decay caused by Armillaria species
Wood decay intensity of major tree species of Poland (i.e. European beech, pedunculate oak, Scots pine and Norway spruce) was investigated by the 3-months treatment of wood samples with five Armillaria species (A. borealis, A. cepistipes, A. ostoyae, A. mellea, A. gallica). Two isolates of each Armillaria species were used. Beech wood samples were most intensively decomposed (average 20,13% of dry mass loss), while Norway spruce – least (7,15%). In the case of this species A. gallica isolates showed especially low decay activity – the loss of dry mass did not exceeded 3%. Among all isolates tested in the experiment those of A. ostoyae were found to cause the highest decrease of beech samples’ dry mass – over 23%. The lowest decay intensity was found for isolates of A. gallica: A. gall.1 – 9,22,87% and A. gall.2 – 11,78%. Similar results were obtained for Scots pine wood samples made out of 18-year old trees. Pine wood samples taken from 80-year old tree were most intensively decomposed by the following isolates: A. mell.1 – 19,07%, A. cep.1 – 19,04% and A. ost.1 – 18,34%. The oak wood samples were most rapidly decomposed by isolate A. ost.1 – 21,5%.
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