Insecticidal control of phytophagous insects during the growing season of corn in the Right-Bank Forest-Steppe of Ukraine

Abstract

The importance of the species distribution, the period of settlement and the number of maize phytophages, which affects the other half of the growing season, and the effec- tiveness of insecticides for their application to the growths against this groups of mischief-makers in the minds of the Right Bank Forest-Steppe of Ukraine. Methodi. Field research – laying out the field survey, conducting surveys and taking care. Information-analytical – analysis of liter- ary sources on the subject being pursued. Mathematical- statistical analysis of variance for processing experimental data. The pre-investigation scheme included five options. Insecticides were studied to replace the active substances lambda-cyhalothrin, 50 g/l.; Thiamethoxam, 250 g/l + lamb- da-cyhalothrin, 80 g/l + alpha-cypermethrin, 15 g/l; thia- cloprid, 100 g/l + deltamethrin, 10 g/l; chlorantraniliprole, 100 g/l, lambda-cyhalothrin 50 g/l. Field investigations were carried out in the minds of STOV “Im. Shevchenko” Khmelnitsky district, Khmelnytsky region. Results Based on the results of three studies, the main phytophages of corn in the other half of the growing season are the emerging corn beetle (Diabrotica virgifera virgifera Le Conte) and the corn stem borer (Ostrinia nubilalis Hbn.). The population of the bushes by caterpillars of the moth moth (Helicoverpa armigera Hbn.) in the middle of the last period during the flowering phase reached 3.8 %, which is significantly lower than the FSN (15 %). The number of corn blizzard cater- pillars in corn crops during the three periods of monitoring before mowing became 20.4–23.5 individuals/100 plants. After 3 days after treating the crops with insecticides, the number of caterpillars changed significantly and was in the range of 5.1–6.3 individuals/100 plants, while in the control variant it was 26.7 individuals/100 plants, and after 7 days 4.2–6.2 individuals / 100 roslins versus 29.7 individuals / 100 roslins. The effectiveness of insecticides on the third day after cultivation became 69.6–78.5 %, on the 7th day 70.5–79.4 %. Insecticides, when sprayed with them, sig- nificantly reduced the number of adult corn beetles – the effectiveness was 86.1–88.7 % on the third day, and 85.0–93.5 % on the first day. Visuals: In the Right Bank Forest-Steppe, the main phytophages of corn during the other half of the growing season are the emerging corn beetle (Diabrotica virgifera virgifera Le Conte) and the corn stem shooter (Ostrinia nubilalis Hbn.). When applying insecticides Antigusin, KS 0.3 l/ha, ATO ZHUK, KS, 0.2 l/ha, Proteus® 110 OD MD, 1.0 l/ha, Ampligo 150 ZC, FC effectiveness against corn panicle caterpillars on the seventh day it was 70.5–79.4 %, against the adult corn beetle it was 85.0–93.5 %.