Abstract
Investigations of genetic diversity of <em>Heterobasidion</em> spp. in Scots pine, Norway spruce and European silver fir stands indicated that almost all of identified genets occurring in those stands were small and occupied only a single stump. In some cases two, three or even four genets could effectively exist in an individual stump. Genetic similarity of <em>H. annosum</em> s.s. genets varied from 0% to 62%, <em>H. parviporum</em> from 0% to 38% and <em>H. abietinum</em> from 0% to 55%. The oldest and biggest genet was found in laying fir log and overgrew the wood for at least 14 years. This genet belonged to <em>H. abietinum</em>. The size of genets was related to thinning operation, spore dispersal, age of stand or competition in wood colonization.
Highlights
Root and butt rot caused by Heterobasidion spp. is the most important disease in forests
Heterobasidion parviporum infected almost only Norway spruce (Picea abies (L.) Karst.) is noted in south and northeast part of Poland and Heterobasidion abietinum appeared on European silver fir (Abies alba Mill.) stumps or laying logs in south Poland
On the base of somatic incompatibility test this area was colonized by 32 genets of H. annosum sensu stricto
Summary
Root and butt rot caused by Heterobasidion spp. is the most important disease in forests. Appearance of new genets in stands is related to new spore infection, thinning operations and pathogen’s frequency and in particular basidiocarps on stumps or trees. Small size of genets might be resulted by lacking of roots contact and impossibility of mycelium transfer among trees and stumps.
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