Occurrence and peculiarities of tree colonization by stem pests in pine stands weakened by different factors in the forest-steppe part of Kharkiv region
Journal Title: Лісівництво і агролісомеліорація - Year 2016, Vol 129, Issue
Abstract
Six species of invasive stem insect species in pine plantations in the region were detected. Tomicus piniperda L. (39%) dominated in the focus of the root rot, Ips sexdentatus Boern. (47.3%) and Tomicus minor Hart. (41.2%) dominated in the ground fire area. Т. minor Hart. (42.3 %) dominated in the foci of foliage browsing insects. Colonization of Ips acuminatus Gyll. was observed in the area of thin bark. Colonization of Т. minor was found in the area of thin and transition bark. Another aggressive species were found in the area of thick and transition bark. Depending on time when pines are weakened different phenological complex of insects forms under bark of trees. Т. piniperda and T. minor were found in spring. I. acuminatus and sexdentatus were found in spring and summer. Monochamus galloprovincialis Germ. and Phaenops cyaneus Fabr. were found in summer. Colonization of different parts of stem by stem pests depends on the part’s diameter. Insect colonization reduces with diameter. The lower part of tree was the most colonized by stem pests.
Authors and Affiliations
O. Zinchenko
Keywords
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