Dynamics and development of annosum root rot in Scots pine provenances in Serebryanoborsky experimental forestry

The dynamics of annosum root rot development in Scots pine provenances of the 4th age-class in Serebryanoborskoe Experimental Forestry of Institute of Forest Science Russian Academy of Science (Moscow region) is analyzed. It is determined that for the period from 2014 to 2023 the rate of trees dieback caused by annosum root rot on the trial plots has increased many times, new pockets with affected trees have appeared. The pathological process began at the same time with the natural differentiation of trees, and the annosum root rot infected mainly suppressed pines, then the dieback spread to larger trees. An analysis of the spatial arrangement of disease pockets showed that one disease center could spread over two or more trial plots with different pine provenances, which suggests association of disease pockets with tree growth conditions including edaphic ones. However, some provenances, despite their proximity to the affected plots, retained resistance to the root rot. These are provenances from the Tver, Kaluga regions, Karelia, Latvia and the Mogilev region of Belarus. On these trial plots, monitoring of the condition of the plantings should be continued. Using the method of dendrochronological analysis, it was established that the greatest influence on the value of the radial growth index of trees is exerted by precipitation falling during the growing season and, in general, by the moisture availability during the growing season. After a drought, a sharp decrease in growth is observed in all climatypes, but a greater response of growth to precipitation deficit is observed in climatypes with a higher level of root rot damage. During 2014- 2023 the degree of influence of climatic factors on the magnitude of the radial growth of trees increased, which contributed to their weakening and increase the rate of trees dieback caused by annosum root rot.

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