New domestic "Stylet" insecticide testing when protecting from cotton bollworm caterpillars on tomato

Caterpillars of the cotton bollworm (Helicoverpa armigera Hb.) are the main pest of tomato fruits in the Astrakhan Region. It was revealed that in the region the cotton bollworm develops in 3 generations during the growing season of tomato plants. The first generation of the cotton bollworm develops mainly on alfalfa (Medicago sativa) and weed plants. Caterpillars of the second and third generation of the cotton bollworm cause significant harm to tomato fruits in the fruiting phase. The purpose of research is to assess the bio-logical effectiveness of a single application of the new insecticide "Stylet" against the caterpillars of the cotton bollworm (Helicoverpa armigera Hb.) during the growing season of tomato plants of the Novichok rozovyi cultivated in the open field on drip irrigation. Two rates of consumption of the preparation "Stylet", MD – 0.3 and 0.4 l/ha are studied, the preparation "Avant" was taken as a standard, EC – 0.3 l/ha. The effectiveness of insecticides was assessed by damaged fruits before treatment and on days 3, 7, and 14 after treatment. It was found that within two weeks after the treatment, the biological effect from the use of the standard "Avant", CE with a consumption rate of 0.3 l/ha was obtained within 33.5–66.1 %, from spraying tomato plantings with "Stylet", MD in norms 0.3 l/ha – 37.9–72.0 % and 0.4 l/ha – 55.7–82.7 %. A single use of the insecticide "Stylet", MD at rates of 0.3 and 0.4 l/ha contributed to an increase in the yield of the cultivated crop by 8.7–9.8 t/ha, respectively, compared with the control option (without treatment). The insecticide used during the growing season did not have a negative effect on the quality indicators of tomato fruits.