The aim of his study was the analysis of H. annosum s. s. stand infection and also the stumps colonization by P. gigantea and H. annosum a year after stumps inoculation with biopreparation. The study was conducted in 40-year-old Scots pine stand growing on the post arable soil, where two plots had been established. After commercial thinning the stumps treatment with P. gigantea was done. There were no sporocarps or mycelium of both H. annosum and P. gigantea on investigated stumps. The mycological analysis of wood showed that 64-72% stumps were colonized by P. gigantea and 14-17% by H. annosum. The mycelium of both fungi was also isolated from roots (34-42% colonized by H. annosum and 21-31% by P. gigantea). This study confirmed that stumps treatment in pine stands growing on the post arable soil plays the important role in avoiding the risk of Heterobasidion disease.

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