Spread and injuriousness of stem insects in unclosed scots pine plantations in pine forests in Siversky Donets river valley depending on forest site conditions
Journal Title: Лісівництво і агролісомеліорація - Year 2015, Vol 127, Issue
Abstract
Distribution of pine stands by forest site conditions in the territory of pine forests in Siversky Donets river valley (so called “Near-Donets bors”) and its relations with spread and injuriousness of stem insects in unclosed Scots pine plantations of this region were studied. It was shown that, from northwest to southeast, the part of area with relatively poor site conditions (B) decreases, the part of poor site conditions (A) increases, the part of fresh hygrotops decreases, and the part of very dry and dry hygrotops increases. Mean population density of pine weevil (Hylobius abietis) and bark beetles (Hylastes ater, Hylastes opacus, Hylastes angustatus and Hylurgus ligniperda) in all forest site conditions is slightly greater in the forest-steppe part of Near-Donets bors than in the steppe part of it. Abundance of stem insects is in concordance with wood stock which determines the amount of substrate for colonization and depends mainly on forest site conditions. High positive correlation is calculated between stem insects abundance and the part of damaged seedlings. At similar abundance of stem insects, mortality of seedlings with the lowest root collar diameter is the most likely.
Authors and Affiliations
V. Meshkova, I. Sokolova, L. Koval, A. Kochetova, S. Eroshenko
Keywords
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