Protection of forests in the Omsk Irtysh region from leaf-eating and pine-eating forest insects
Автор: Leshchina M.M., Barayshchuk G.V.
Журнал: Вестник Омского государственного аграрного университета @vestnik-omgau
Рубрика: Агрономия
Статья в выпуске: 2 (54), 2024 года.
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In the forest-steppe conditions of the Omsk region, there are species of forest insects capable of producing outbreaks of mass reproduction. The gypsy moth is the most dangerous phyllophage, as it forms large-scale foci of high numbers. A more than 30-year period of observations of Omsk forests has been analyzed, which indicates different scales of mass outbreaks of gypsy moth. It was revealed that in 2014 the largest breeding area of the gypsy moth was recorded - 1,405,126 hectares. There is a connection between the mass appearance of the gypsy moth and other species of gnawing forest insects. Thus, significant planting areas were attacked in 2015-2016 by the pine moth - 171.5 and 86.6 hectares, respectively. A total of 16 species of leaf- and needle-eating insects were identified. Of the secondary pests, from 1991 to 2007 there was a high number of the European spruce beetle; in 1992-1993, the appearance of the big black spruce sawyer was recorded. The resulting digital material allows us to determine the peaks of mass outbreaks of gypsy moth in the Omsk region: 1996, 2005, 2014, 2023 with intervals of 9 years. At the same time, the scale of the foci and the time the population spent in the eruptive phase are different from each other. The peak of the highest gypsy moth numbers in 2005-2006 and 2022-2023 lasted for two years, and in 2013-2015 - for three years. All bacterial preparations used during outbreaks to treat forests were based on Bacillus thuringiensis (Bt) and gave high results in biological efficiency - from 77.2 to 91.3%. The established regularity of occurrence of foci of mass reproduction of the gypsy moth, the predictability of changes in numbers towards an increase, indicates the need for protective measures at the very beginning of the population increase, which could significantly reduce the damage from the impact of this phyllophage.
Phyllophages, environmentally friendly preparations, mass outbreaks
Короткий адрес: https://sciup.org/142241281
IDR: 142241281