Abstract
The article presents the results of studying the genetic polymorphism of Heterobasidion (root rot agent) isolates that
 infect Norway spruce (Picea abies) in various regions of Belarus. Based on the data obtained, a comparative assessment of the suitability of STS markers for species diagnostics of fungal isolates (Heterobasidion annosum (Fr.) Bref. sensu stricto (s. s.) and Heterobasidion parviporum Niemelä & Korhonen) was carried out. Samples of the sporocarp and infected wood were collected in Norway spruce stands on the territory of three geobotanical subzones — in seven forestry enterprises of the Ministry of Forestry of the Republic of Belarus, on the territory of the Negorelsky educational and experimental forestry and the National Park "Belovezhskaya Pushcha". Based on the comprehensive analysis of the samples, markers for specific molecular genetic diagnosis of H. annosum and H. parviporum were recommended.
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