From the investigations on Armillaria root rot occurrence in young Scots pine stands in Zielonka Forest District

Abstract

Armillaria root rot, one of the most dangerous diseases in our forests, is caused in Poland mainly by <i>Armillaria ostoyae</i>, especially severe in young Scots pine stands, established after broadleaved stands or with participation of broadleaved species. In Forest District Zielonka young stands are severly affected by Armillaria root rot. Only one species, A.ostoyae, was found in the young (8-14 yrs) Scots pine stands, despite the presence of other <i>Armillaria</i> species in the district. The pathogen's frequent occurrence may be due, <i>inter alia</i>, to favouring environmental factors.