Abstract
The study material consists of 165 H. annosum isolates from 25 different localities. Host species was Pinus sylvestris, Picea abies, Betula pendula, Abies alba, Lnrix decidua, Pinus strobus, Prunus serotina, Quercus rubra. Most of the H. annosum isolates belonged to the P group. This group was most common on pine and birch. The S group infected Norway spruce and European fir. The F group was recorded only in the south of Poland. Only three localities, where this intersterility group was present, were found in Poland.
Keywords
Heterobasidion annosum; intersterilioty groups; Poland