Toxicity and Field Efficacy of Six Insecticides to Main Lepidoptera Pests in Ear Period of Maize
In order to evaluate the application prospect of different types of insecticides on maize to control main Lepidoptera during the maize tassel stage,the toxicity of six insecticides to Helicoverpa armigera,Ostrinia fur-nacalis and Conogethes punctiferalis were determined by Diet incorporation method,and then their control efficiency was evaluated by field tests.The results of toxicity tests showed that chlorantraniliprole,tetrachlorantraniliprole,em-amectin benzoate and chlorfenapyr had higher toxicity to H.armigera,O.furnacalis,C.punctiferalis,with the value of LC50 were 0.29-0.51 mg/L,0.17-0.51 mg/L,0.03-0.20 mg/L and 0.61-8.32 mg/L,respectively.The toxicity of phoxim was the lowest to H.armigera,O.furnacalis and C.punctiferalis,with the value were 121.01 mg/L,80.39 mg/L,63.48 mg/L.The field efficacy test of six insecticides showed certain control effects on maize pests in ear period.Each treatment of chlorantraniliprole,tetrachlorantraniliprole,emamectin benzoate and chlorfenapyr has a high con-trol effect on those pests,with the control effect were 73.29％-83.52％,significantly higher than the treatment of me-thoxyfenozide and phoxim,and can effectively control the damage of pests.Based on the toxicity and field efficacy tests,chlorantraniliprole,tetrachlorantraniliprole,emamectin benzoate and chlorfenapyr have good application pros-pects in the control of maize ear pests.In the field control,appropriate pesticides can be reasonably selected.
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