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Bokina I.G.,Siberian Institute of Agriculture and Chemicalization
Zoologicheskii Zhurnal | Year: 2012

In the forest-steppe of Westem Siberia, among 29 species of predatory hover-flies recorded in agrocenoses of cereals and on bird cherry (the primary host of Rhopalosiphum padi), Episyrphus balteatus, Scaeva pyrastri, Sphaerophoria scripta, Melanostoma mellinum and flies of the genus Platycheirus are dominant species. Bioecological features and the data on the dynamics of the hover-flies number in the agrocenoses of winter rye, spring wheat and oats, perennial and biennual grasses are given. The influence of agrotechnological measures on these characteristics is shown. The numbers of cereal aphids and hover-flies are the highest on spring wheat cultivated with the use of a complex of fertilizers and pesticides. The basic soil treatment and predecessors in the rotations did not affect the abundance of hover-fly larvae. On wheat grown with applying a complex of chemicals, the number of Syrphidae was greater than in its growing on the fallow as the fourth culture. In crop rotations, hover-flies preferred the crops with mass breeding of aphids and flowering grasses - wheat after the fallow, oats, vetch-oats, and barley with melilot. At the low population density of cereal aphids, the number of Syrphidae on all the cultures was low. Despite the constant dwelling of flies on wild herbs, melilot, sainfoin, alfalfa, clover, and the abundance of aphids on these grasses, larvae of hover-flies were single. On wild herbs and bromegrass, larvae of hover-flies were not found. This fact appears to be related to the microclimate forming within dense grass cultures. Source


Bokina I.G.,Siberian Institute of Agriculture and Chemicalization
Entomological Review | Year: 2012

In the forest-steppe of Western Siberia, the dominant species among 29 species of predatory hoverflies recorded in cereal agrocenoses and on the bird cherry (the primary host of Rhopalosiphum padi) are Episyrphus balteatus, Scaeva pyrastri, Sphaerophoria scripta, Melanostoma mellinum, and flies of the genus Platyheirus. The bioecological features and the data on the dynamics of the hoverfly abundance in the winter rye, spring wheat and oats, and perennial and biennial grass agrocenoses are presented. The influence of agrotechnological measures on these characteristics is shown. The numbers of cereal aphids and hoverflies are the highest on spring wheat cultivated using a complex of fertilizers and pesticides. The basic soil treatment and precursors in crop rotation did not affect the abundance of hoverfly larvae. On wheat grown with application of a complex of chemicals the abundance of Syrphidae was greater than when it was grown after fallow as the fourth culture. In crop rotation, hoverflies preferred the crops with mass breeding of aphids and flowering grasses: wheat after fallow, oats, and barley with melilot. At low population density of cereal aphids the number of Syrphidae on all the cultures was low. Despite the constant presence of flies on wild herbs, melilot, sainfoin, alfalfa, clover and the abundance of aphids on these grasses, larvae of hoverflies were scarce. On wild herbs and brome grass, larvae of hoverflies were not found. This fact appears to be associated with the microclimatic conditions of dense grass cultures. © 2012 Pleiades Publishing, Ltd. Source


Bokina G.,Siberian Institute of Agriculture and Chemicalization
Zoologicheskii Zhurnal | Year: 2010

In the forest-steppe of Western Siberia, twelve species of golden-eyed flies {Chrysopa altaica, Ch. commata, Ch. perplexa, Ch. phyllochroma, Ch. dasyptera, Ch. carnea, Ch. formosa, Ch. intima, Ch. perla, Ch. prasina, Ch. septempunctata, and Niñeta inpunctata) were identified in grain agroecosystems. Ch. carnea and Ch. phyllochroma were dominant species. Biological characteristics, seasonal dynamics of the number of golden-eyed flies in the agrocenoses of winter rye, spring wheat and oats are given. The level of chemicalization upon condition of the rational use of insecticides, soil treatment system, predecessors did not affect the number of larvae and imago of golden-eyed flies in the spring wheat agrocenosis. In the years when the density of goldeneyed flies was low, no differences in their population between the agrocenosis of wheat (after fallow), winter rye, oats, vetch-oats, canola, barley, and barley with melilot were found. Under a relative abundance of golden-eyed flies, they occurred more frequently in the crop rotations with wheat after fallow and with oats. These plants were settled by cereal aphids to the greatest extent. In all the years investigated, the number of goldeneyed flies on alfalfa was 2-2.8 times higher than their number on wheat after fallow. Source


Bokina I.G.,Siberian Institute of Agriculture and Chemicalization
Entomological Review | Year: 2010

Twelve species of lacewings: Chrysopa altaica, Ch. commata, Ch. perplexa, Ch. phyllochroma, Ch. dasyptera, Ch. carnea, Ch. formosa, Ch. intima, Ch. perla, Ch. prasina, Ch. septempunctata, and Nineta inpunctata were found in cereal agroecosystems of the forest-steppe zone of Western Siberia. The dominant species were Ch. carnea and Ch. phyllochroma. The biological characteristics, seasonal dynamics of the abundance of lacewings in the agrocenoses of winter rye, spring wheat, and oats are given. The abundance of larval and adult lacewings in the spring wheat agrocenosis was not affected by the level of chemicalization (upon condition of the rational use of insecticides), tillage variant, and predecessor crop. In the years when the density of lacewings was low, no differences in their population were found between the agrocenoses of wheat (after fallow), winter rye, oats, vetch-oats, canola, barley, and barley with melilot. In the years characterized by relatively high abundance of lacewings, they occurred more frequently in the crop rotations with wheat after fallow and with oats. These plants were settled by cereal aphids to the greatest extent. In all the years studied, the density of lacewings on alfalfa was 2-2. 8 times as great as that on wheat after fallow. © 2010 Pleiades Publishing, Ltd. Source

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