Hornovska S. Agroecological Substantiation of Control of the Number of Main Sunflower Phytophages in the Left Bank Steppe of Ukraine

Results of the dissertation aim to reflect the generalization of agroecological substantiation of control of the number of basic phytophages of sunflower in the Left Bank Steppe of Ukraine is developed. Dominant phytophages of sunflower have been established: southern sunflower tumbling beetle (Mordellistena parvuliformis Stscheg.-Bar.), meadow butterfly (Loxostege sticticalis L.), gray beet weevil (Tanymecus palliates F.), tailor-headed (Lethrus apterus Laxm.), laxus aphid (Opatrum sabulosum L.). Features of biology, distribution, harmfulness, measures of protection against them are investigated. The generalization of long-term indicators of the dynamics of the number of phytophagous insects depends on weather and climatic factors, as well as the technology of sunflower cultivation are generalized. Particular attention is paid to the role and importance of crop protection systems against major pests in the Left Bank Steppe of Ukraine. The system of control of the number of sunflower phytophages has been improved. Highly effective and ecologically safe systems of protection of sunflower plants from harmful organisms are developed. An effective system of crop protection is the use of insecticides Koragen 20, KS ‒ 0.2 l/ha; Decis f-Lux 25 EU, KE ‒ 0.5 l/ha; Engio 247 SC, KS ‒ 0.2 l/ha. The use of insecticides against harmful phytophagous helps to preserve the crop and improve its quality. Relatively high conditional net profit was obtained with the use of insecticide Koragen 20, KS (7196 UAH/ha). The level of profitability when applying the insecticide was 108.1 %. The use of Engio 247 SC, KS and Decis f-Lux 25 ES, KE, where the net profit was 6366 and 7159 UAH/ha at the level of their profitability 106.3 and 113.7 %, respectively, turned out to be economically profitable. The effectiveness of the insecticides Engio 247 SC, KS, Koragen 20, KS and Decis f-Lux 25 ES, KE ensured the preservation of the yield of 0.39‒0.72 t/ha and a net income of over 7000 UAH/ha.