Bio-efficacy of chemical insecticides against Spodoptera litura in soybean

The investigation on bio-efficacy of chemical insecticides against S. litura infesting soybean was conducted at Main Oilseeds Research Station farm, Junagadh Agricultural University, Junagadh during Kharif, 2023. Of the seven insecticides evaluated against S. litura, the treatment of chlorantraniliprole 10 + lambda-cyhalothrin 5 ZC @ 0.006% recorded the lowest (1.06) larvae/plant, which was statistically at par with novaluron 5.25 + emamectin benzoate 0.9 SC @ 0.009% (1.25 larvae/plant) and novaluron 5.25 + indoxacarb 4.5 SC @ 0.016% (1.38 larvae/plant) after 3 days of the first spray. A similar trend was seen after 7 and 10 days of the first spray as well as 3, 7, and 10 days after the second spray. The highest (2640 kg/ha) yield of soybean was produced in the treatment of chlorantraniliprole 10 + lambda-cyhalothrin 5 ZC 0.006% followed by novaluron 5.25 + emamectin benzoate 0.9 SC 0.009% (2346 kg/ha) and novaluron 5.25 + indoxacarb 4.5 SC 0.016% (2268 kg/ha). Looking to the ICBR, the treatment of chlorantraniliprole 10 + lambda-cyhalothrin 5 ZC 0.006% noted the highest (1:8.8) ICBR followed by thiamethoxam 12.6 + lambda-cyhalothrin 9.5 ZC 0.011% (1:8.3) and chlorpyriphos 50 + cypermethrin 5 EC 0.11% (1:7.1).