CONDITION AND FUNGAL DISEASES OF SCOTS PINE PROVENANCE TRIALS

The experience of creating and studying Scots pine ( Pinus sylvestris L.) provenances shows that there is a connection between the success of growing trees and their geographical origin. Some of them are capable of surpassing local ones in terms of productivity, yield and other features. To select successful climatypes, it is important consider their sustainability to various unfavorable environmental factors, including fungal diseases. The most dangerous pine disease is annosum root rot ( Heterobasidion annosum (Fr.) Bref.). The studies were carried out in Scots pine provenance trials of the Orekhovo-Zuevsky forestry district (east part of Moscow region) in the period from 2016 to 2023. The current health and phytopathological state of 38 climatypes, as well as adjacent pine stands of local origin, have been assessed. A complex of 12 species of fungi associated with pine have been identified. H. annosum causes the greatest damage. Numerous pockets of dead trees associated with the development of this pathogen have been identified in the areas. The proportion of dieback trees in different origin pine stands is not the same: 22 climatypes are superior to forest stands of local origin. Most climatypes from the northwestern and western regions relative to the control (Lithuania, Estonia, Brest region of Belarus), as well as some from neighboring regions (Smolensk, Bryansk, Ryazan regions) are more successful. Almost all unfavorable climatypes originate from regions located east of the test plot (Kostroma, Samara, Sverdlovsk, Novosibirsk regions). Pine stands originated from Udmurtia, Bashkortostan, Omsk region and Yakutia are characterized by a successful state, despite their origin from the regions, very remote from the trial location.

Heterobasidion annosum, climatypes, success of climatypes, forest diseases, annosum root rot, Heterobasidion annosum, root rot disease centre