Field efficacy evaluation of five insecticides against pieris rapae on cabbage

WANG Yina; YANG Simin; XIAO Xueqing; LIU Yating

Abstract：Objective This study aims to clarify the efficacy of different insecticides on the control of pieris rapae,and to assess the effect of the insecticides on the growth of cabbage.Methods Field efficacy trials were conducted with five insecticides,namely Bacillus thuringiensis,Lambda-cyhalothrin,Chlorantraniliprole,Emamectin and Matrine.Results The efficacy of 0.5％Matrine AS and 5％Emamectin WG were 99.03％and 92.38％,respectively,1 day after application,both of which showed good rapid efficacy.5％Emamectin WG and 8 000 IU/ul Bacillus thuringiensis SC had the highest efficacy on the 7th day after application,at 100％and 93.07％,respectively,and the efficacy of both remained above 70％at 14th day after application.None of the five treatments caused any damage to the cabbage,and the growth of cabbage was promoted by Lambda-cyhalothrin,Bacillus thuringiensis and Emamectin to some extent.Conclusions The overall performance of 5％Emamectin WG is the best.0.5％Matrine AS is the best in terms of speed,and 8 000 IU/ul Bacillus thuringiensis SC is better in terms of persistence.It is suggested that the above three kinds of insecticides should be used in rotation for scientific control of pieris rapae.