The results of the study of morphological and biometric characteristics of Scots pine trees with a various health condition in the 5th and 6th age class stands affected by annosum root rot are presented. Trees with no signs of weakening (‘resistant’) and with signs of the disease (‘affected’) were selected in dieback foci, as well as the health trees with no signs of the disease in the area between the foci as control. The qualitative and quantitative characteristics of cones, seeds, and wings (color, size, shape, and weight) were evaluated. Pine trees with higher resistance have a larger size of reproductive organs than those with signs of disease or in control. It is the result of a tree’s adaptation to open space of the gap against the background of pathological processes developing and is weakly related to the tree’s genetic peculiarities. In the foci, a significantly larger variability in diameter (Cv = 21.2…27.4 %) comparing to that in ‘affected’ trees (Cv = 8.9…12.1%) is characteristic of trees with increased resistance.
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