Toxicity and Field Control Efficacy of Several Insecticides against Plutella xylostella
[Objective] The study aimed to screen out the insecticides for controlling Plutella xylostella (L.) effectively.[Method] The toxicity of emamectin benzoate etc 6 pesticides to Plutella xylostella were determined with topical application method, and the field plot experiment with foliar spraying by insecticides added to the water was conducted for determining the field control efficacy of five better insecticides to Plutella xy lostella.[Result] The results showed that the LC50 of emamectin benzoate was 0.17 mg/L, and the LC50 of chlorantraniliprole was 0.44 mg/L.But the LC50 of 4 other insecticides were higher than emamectin benzoate and chlorantraniliprole, which were 0.84 mg/L, 1.25 mg/L, 10.43mg/L and 11.17 mg/L.Chlorantraniliprole was the best choice to control of Plaella xylostella in the field after 6 days, which was 82.33％, and the others were 60.50％ ,58.02％ ,55.64％ and 55.40％.[Conclusion] The reference for control the Plutella xylostella was provided.
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