Medvid Y. Ladybirds (Coleoptera: Coccinellidae) in the Agrocoenosis of Ukrainian Right-Bank Forest Steppe and their Role in Phytophagous Control

The Coccinellidae Latr. family has an important economic value in the human business activities. Most species are predators of aphids, scale insects, thrips, spider mites, leafhoppers, whiteflies, eggs and larvae of other small arthropods. Coccinellids are marked by their high gluttony, polyphagous, fertility. Beetles and larvae of ladybirds play a significant role in the quantity control of pests of agricultural, forest and ornamental plants. As a result of the researches the coccinellids fauna of typical agrocoenosis of Ukrainian Right-Bank Forest Steppe was specified. Also there were educed 16 species of coccinellids, among them seven spot ladybird (Coccinella septempunctata L.) and variegated lady beetle (Hippodamia variegata Gz.) were marked as dominants, fourteen spot ladybird (Propylea quatuordecimpunctata L.) and Asian lady beetle (Harmonia axyridis Pall.) as subdominants. In the production experiment on corn crop after insecticides application the mean quantity of coccinellids was: on control — 3,5 exemplars/m2 , Ampligo 150 ZC (chlorantraniliprole, 100g/l+lambda-cyhalothrin, 50g/l) — 0,4 exemplars/m2, Belt 480 SC (flubendiamide, 480 g/l) — 0,7 exemplars/m2, Coragen 20 SC — 2,4 exemplars/m2. The estimation of economic efficiency showed the highest profitability of the insecticide Coragen 20 SC (440,16 %) spraying of which contributed to the preservation of the yield on 0,96 t/ha and provided the net profit on the level 3 817,5 UAH/t. The use of preparation Ampligo 150 ZC allowed to obtain a preserved yield of 0,73 t/ha with a net profit of 2 647,4 UAH/t and the level of profitability 289,33 %. After application of insecticide Belt 480 SC a preserved yield was 0,32 t/ha, a net profit —873,1 UAH/t, the level of profitability — 126,81 %.