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Based on the analysis of database of the pine stands of Belarus affected by annosum root rot, and the results of longstanding research the substantiati on of silvicultural criteria for designation of stump treatment with biological preparations in the pine fore sts to limit the severity of the pathogen is given. It is proposed to differ site selection for stump treatment according to the regional-typological principle because of significant differences in the relative infestation of pine stands in different forest conditions. It was found that that the treatment should be carried out in pine stands of mossy and bracken series of forest types I–III age classes, and in the pine forest s of Gomel and Mogilev region also in age class IV, as well as heather, lichen and cranberry series of fore st types. In this case, the use of biological agents on the basis of the fungus Phlebiopsis gigantea is useful when conducting selective and complete sanitary felling (regardless of intensity), as well as thi nning and cleaning litter (with a sample of at least 20% of a physiologically live pine wood is cut down from the stock) at steady daily average tempera-tures of at least +5°C.

The paper presents a ranking of forest sites according to the threat ofinfection of planting Pinus sylvestrisstands by Heterobasidion annosum.8 degrees of treat of infection are marked out according to the site characteristics and types of habitat and moisture conditions. Presented gradation underlined planning of forest stands with susceptible species, that would allow to make for creation of more stable stands, reduction of infection and decrease costs of protection measures.

Biological method, consisted in stump treatment with preparations on the basis of antagonistic fungus Phlebiopsis gigantea (Fr.) J?lich has a wide application in the complex of protective measures, restricting harmfulness of Heterobasidion spp. Efficacy of pine stump wood colonization with seven strains of P. gigantea, screened during laboratory experiments, was investigated for selection of effective belarusian strains of antagonist. According to conducted experiments two strains that have the best colonization ability in forming fruiting bodies on 76.0–92.6% treated stumps in six months were selected. These strains can underline development of native biological preparation.

В условиях Беларуси наибольшую вредоносность и повсеместную распространенность имеют грибные патогены корней древесных пород из рода Heterobasidion (корневая губка). Приобретая эпифитотийный характер, болезнь приводит к снижению устойчивости и, в конечном итоге, к полному расстройству и гибели хвойных насаждений. Для решения данной проблемы необходимо противопоставить заболеванию систему лесозащитных мер, основанных на результатах подробного анализа данных о распространенности заболевания в лесном фонде страны. С целью проведения такого анализа была создана база данных сосновых насаждений, пораженных корневой губкой, на основе проверенной и уточненной при проведении лесопатологических обследований информации об очагах патогена, зарегистрированных в «Книге учета очагов и вредителей болезней леса», которая ведется в каждом лесохозяйственном учреждении.