Ivanova K. Substantiation of protection measures of grain sorghum form the main insect pests in the Forest-steppeof Ukraine

In the dissertation it substantiated improvement of the protection technologies of grain sorghum from a complex of pest insect with monitoring of distribution in grain sorghum’ modern hybrids cultivation that’ll increase grain production in the Forest–steppe of Ukraine. The influence of the complex of the above mentioned factors on the formation of the sorghum entomocomplex with the estimation of the mechanisms of selfregulation of insects is statistically confirmed by the growing periods of 2014–2017. Thus, at 7 days after spraying of grain sorghum with modern insecticides, their technical efficiency was 72.6–98.8 %. Among the investigated insecticides, the technical efficiency of the Engeo 247SC, 24.7 % s. c. standard, compared to Nurel D, 55 % e. k. and its analogue Chlorpirіvite-agro, 55 % e. k. was high. The application, in particular, of Trichogramma against pests of Lepidoptera order, at 73.4–86.2 %, helps to reduce the damage number of vegetative and generative parts of grain sorghum, by caterpillars of Lepidoptera order pests’.Optimal protective measures are developed, which are based on the implementation of preventive and time by application of chemical protective measures that optimize the agronomic and phytosanitary characteristics of the production of grain sorghum in the region of research.