EVALUATION OF THE ECOLOGICALLY SAFE INSECTICIDAL ACTIVITY OF NATURAL ENDOPHYTIC STRAINS OF BACILLUS THURINGIENSIS, ISOLATED IN THE TERRITORY OF UZBEKISTAN, AGAINST THE COLORADO POTATO BEETLE (LEPTINOTARSA DECEMLINEATA)
The Colorado potato beetle (Leptinotarsa decemlineata Say) poses a serious threat to solanaceous crops due to the rapid
development of resistance to chemical insecticides. The aim of this study was to evaluate the insecticidal efficacy of local isolates
of Bacillus thuringiensis from Uzbekistan against L. decemlineata larvae and to select promising strains for the development of a
biopesticide. A collection of native strains was isolated and screened, followed by statistical analysis using ANOVA and Tukey's
test. Four highly effective strains were identified. Strain UzBt-07 caused 86.7% mortality in first-instar larvae, statistically
confirming its leading position.
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