Author(s): Sushila Nadagoud, Basavaraj S Kalmath, Shivaleela Gouda, AG Srinivas, Hadimani DK and Sanganna Sajjanar

Abstract: Bollworms and defoliators are the important insect pests of cotton, causing severe damage in the vegetative and boll formation stage of the crop. These insect pests developed resistance to most of the insecticides. In the present study, novel Chlorantraniliprole 600 g/l SC formulations was evaluated against American Bollworm (Helicoverpa armigera) and tobacco caterpillar (Spodoptera litura)in cotton crop. Chlorantraniliprole 600 g/l SC @ 40 g a.i./ha continued to be the most effective molecule after three, seven and ten days of second spray by recording lowest larval population of 0.09, 0.16 and 0.20 larvae per plant respectively. Larval population of S. litura noticed at ten days after spraying was significantly less in highest dosage treatment of in Chlorantraniliprole 600 g/l SC @ 40 g a.i./ha (0.27 larvae/plant). Significantly highest seed cotton yield was recorded by the treatment Chlorantraniliprole 600 g/l SC @ 40 g a.i./ha (17.73 q/ha). The predatory populations were statistically on par with all the dosages of Chlorantraniliprole 600 g/l SCas well as with the standard check treatments, indicating that, the test chemical does not affect the natural enemies population significantly. The phytotoxicity study revealed that, there was no phytotoxicity symptoms on cotton plants treated with both the dosages of Chlorantraniliprole 600 g/l SCi.e., 30 and 60 g a.i./ha. Hence, Chlorantraniliprole 600 g/l SC @ 30 g a.i./ha can be recommended to control H. armiger and S. litura in cotton crop.

DOI: 10.33545/26174693.2024.v8.i6Sj.1415