Relative toxicity of newer insecticides against Spodoptera litura and Pieris brassicae infesting Cole crops in Punjab

Abstract

Present studies were conducted to estimate the relative toxicity of six new generation insecticides viz., emamectin benzoate, indoxacarb, flubendiamide, novaluron, chloratraniliprole and spinosad to Spodoptera litura and Pieris brassicae on Cole crops. The relative toxicity estimates revealed that chlorantraniliprole, spinosad, flubendiamide, novaluron, emamectin benzoate were 52.0, 52.0, 17.33, 2.74 and 2.60 times toxic to third instar larvae of S. litura, while P. brassicae was observed to be relatively more sensitive to these insecticides with relative toxicity to emamectin benzoate, indoxacarb, flubendiamide, novaluron, chloratraniliprole being 85.71, 42.86, 6.0, 3.0 and 3.0, respectively. The LT50 values of these insecticides varied from 62.36 (indoxacarb) to 78.12 hours (flubendiamide) against S. litura and 67.11 (spinosad) to 82.57 hours (flubendiamide) against P. brassicae.