Forest and meadow groups of common oak ecotypes and their phytopathological characterization

      The purpose of the work – to analyze the macromorphological parameters of the crown characteristic of the forest and meadow groups of Quercus robur ecotypes and to provide a comparative phytopathological description of these two groups.

   A comprehensive study of the crown parameters of 28 Q. robur trees and the phytopathological state of the corresponding trees was carried out. We selected 14 specimens of subsenile age (VI< age class), currently confined to open spaces. The crown width was considered as a characteristic feature of this group of ecotypes, the quantitative assessment of which is the ratio of the tree height to the maximum crown width. For comparison, we also randomly selected 14 subsenile trees (VI< age class) from the studied array of forest oak ecotypes and their crown was characterized by the same parameter. The rank analysis of variance according to the Kruskal – Wallis criterion showed a statistically significant difference between the two samples: at the level of p ≤ 0.00001 at p < 0.05 the trees of the meadow and forest groups of common oak ecotypes statistically significantly differ in the condition category. To identify the correlation between the trunk diameters of trees of the meadow and forest groups of Q. robur ecotypes with the condition category and crown lesions by Colpoma quercinum and Vuilleminia comedens, rank correlation analysis was performed according to the Spearman criterion, which showed the following: 1) for trees of the meadow group of Quercus robur ecotypes, a statistically significant relationship was found between the rank of tree diameter and the condition category Rs = 0.73 at p < 0.05; for trees of the forest group of common oak ecotypes, no reliable relationship was found (correlation is not traced), Rs = –0.28; 2) for trees of the meadow group of Q. robur ecotypes, a moderate correlation was found between the crown damage by Colpoma quercinum and the trunk diameter rank, but it was statistically insignificant, Rs = 0.24; 3) for trees of the forest group of pedunculate oak ecotypes, there was no correlation between the crown damage by C. quercinum and the trunk diameter rank, Rs = –0.20; 4) for trees of the meadow group of Q. uercus robur ecotypes, a weak correlation was found between the crown damage by Vuilleminia comedens and the tree diameter rank, but it was statistically insignificant, Rs = 0.10; 5) for trees of the forest group of Quercus robur ecotypes, there was no correlation between the crown damage by Vuilleminia comedens and the tree diameter rank, Rs = –0.26. Thus, it was shown that the phytopathological condition of trees of the two compared groups of ecotypes is significantly affected not by the local hydrological conditions of the habitat, expressed in the thickness of the trunk, but by the value of the crown projection, expressed through the crown coefficient.

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