INSECTICIDAL EFFECT OF BACILLUS THURINGIENSIS STRAINS AGAINST THE COTTON BOLLWORM (HELICOVERPA (HELIOTHIS) ARMIGERA HBN), WHICH CAUSES A SERIOUS THREAT TO COTTON CROPS

Alamuratov Rayimjon; Abdullayev Anvar; Aliyev Zafar; Safarov Husniddin

doi:10.5281/zenodo.8185641

INSECTICIDAL EFFECT OF BACILLUS THURINGIENSIS STRAINS AGAINST THE COTTON BOLLWORM (HELICOVERPA (HELIOTHIS) ARMIGERA HBN), WHICH CAUSES A SERIOUS THREAT TO COTTON CROPS

26.07.2023 International Scientific Journal "Science and Innovation". Series D. Volume 2 Issue 7

Alamuratov Rayimjon, Abdullayev Anvar, Aliyev Zafar, Safarov Husniddin

Abstract. Members of the Noctuidae family live in a variety of environments, and many species of this group are important agricultural pests, with one being Helicoverpa armigera Hbn. Bacillus thuringiensis strains 18fo, 31, 84, and 93, a safe alternative to broad-spectrum chemical insecticides for the control of major pests such as H.armigera due to environmental and regulatory concerns, were evaluated for their insecticidal activity against the second (L2) and fourth (L4) larval stages of the pest. According to the results of the research, Bt-18fo, Bt-93 and Bt-31 strains showed higher entomopathogenic activity on L2-year-old larvae than L4-year-old larvae of the pest, while Bt-84 strain was found to have low insecticidal activity.

Keywords: Bacillus thuringiensis, bacterium, insecticidal activity, Helicoverpa armigera, polyphagous, larva, spore, crystall, toxin

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