Population and harmful potentiality control of the bollworm Helicoverpa armigera hbn. in tobacco agrocenosis by the autosterilization method based on pheromone and juvenoid drug application

The purpose of research is to study the possibility of reducing the number and harmfulness of the bollworm Helicoverpa armigera Hbn. on tobacco plantations by autosterilization with the combined use of pheromone traps and the juvenoid insecticide Admiral, EC (100 g/l). The experiments were carried out at the ARRITTP experimental breeding plot in 2020-2022. The objects of study were the bollworm, the released varieties of tobacco Trapezond 25 and Burley 122. The experiments were carried out in 3 variants: using the methods of autosterilization of moth butterflies with the Admiral juvenoid, CE, elimination, or mass trapping of pest males by pheromone traps (reference variant), and control variant (without processing). The high efficiency of the autosterilization method was established, which reduces damage to the seed pods in the tobacco inflorescence by 79.5-83.8 %. The biological yield of seeds in the experimental variant on the Burley 122 tobacco variety was 243.6-334.7 kg/ha, on the Trapezond 25 variety - 360.2-424.9 kg/ha. Seed losses as a result of caterpillar feeding amounted to 4.8-8.6 and 7.3-11.6 kg/ha, respectively. Biological efficiency in the reference variant (mass capture method) was 84.6-86.4 %. The biological yield of tobacco seeds, taking into account the damage to the fruit elements on the Burley 122 tobacco variety, was obtained in the amount of 272.2-335.9 kg/ha, on the Trapezond 25 variety - 361.4-426.7 kg/ha. Seed yield losses were 3.8-7.4 and 6.1-9.8 kg/ha, respectively, for the varieties. In the control variant of the experiment, the seed yield for the years of the study amounted to 250.6-292.7 and 328.0-364.9 kg/ha, respectively. The loss of seed productivity on tobacco variety Burley 122 reached 25.4-50.6 kg/ha and on variety Trapezond 25 - 39.5-71.6 kg/ha.