BIOLOGICAL INSECTICIDE AGAINST INSECT PESTS ON SPRING RAPESEED (BRASSICA NAPUS L.)

Abstract

As part of the transformation of plant protection against pests, it is necessary to study new biopesticides that will not have a negative impact on the environment. The
aim of the research was to study the effect of a bioinsecticide on the number of insect pests on
spring rapeseed (Brassica napus L.). The studies were carried out in the field conditions in
All-Russian Research Institute of Oil Crops on rapeseed of Tavrion variety in 2019-2021. The
scheme of the experiment included insecticides: a chemical solution with active ingredients
chlorpyrifos 400 g/l + bifenthrin 20 g/l, EC with application rate of 0.5 l/ha (as a reference); a
biological product, which contain bacteria of the genus Bacillus Cohn (concentration not less
than 2x109 CFU/ml3) with application rate of 5.0 l/ha; a mixture of a biological preparation +
liquid high-molecular fertilizer for plant treatment (fertilizer No. 1) with application rate of
5.0 l/ha; mixture of a biological preparation + liquid mineral fertilizer with silicon dioxide for
plant treatment (fertilizer No. 2) with application rate of 1.0 l/ha. It was noted that over the
past few years, the main damage to spring rapeseed plants was caused by cabbage aphid
(Brevicoryne brassicae L.), cabbage moth (Plutella xylostella L.), turnip sawfly (Athalia
rosae L.), rape blossom beetle (Meligethes aeneus F.) with a population that annually exceeds
the economic injury level. The decrease in the number of turnip sawfly was caused by one
treatment of spring rapeseed plants. The biological effectiveness of the chemical standard and
biological product in combination with fertilizers on the 3rd day of counting was 100% and
never decreased. In order to reduce the number of cabbage aphid, cabbage moth and rape
blossom beetle, it was necessary to carry out two treatments both with a biological product
(separately and as part of mixtures) and with a chemical standard. The biological effectiveness of all preparations on the 21st day after the second treatment of plants against cabbage
aphid and cabbage moth was 100%, against rape blossom beetle – 92-96%.