Laboratory Toxicity Determination and Control Effect of Chlorantraniliprole on Diamondback Moth 〔 Plutella xylostella(L.)〕

The laboratory toxicity determination and control effects of 4 insecticides on diamondback moth were studied.The result showed that 48 h after spraying the toxicity of 5% chlorantraniliprole SC was the highest.The LC 50 values was 0.563 0 mg.L-1.The toxicity of 10% spinosad WG was the second.The LC 50 values were 0.856 7 mg.L-1.The toxicities of 1.9% emamectin benzoate EC and 1% avermecti EC were lower.The result of field drug effect experiment indicated that the efficacy of 5% chlorantraniliprole 1 000 times liquid SC was the best,reaching 95.04%,which was significantly higher than the other 3 insecticides.The control effect of 10% spinosad WG 5 000 times liquid was the second with the control efficacy of 82.01%.The 1.9% emamectin benzoate EC 1 500 times liquid and 1% avermecti EC 750 times liquid had the lower control effects,with the control efficacy of 71.67% and 63.95%,respectively.