In order to screen out effective insecticides with high insecticidal activity against Assara inouei Yamanaka,under laboratory conditions,immersion method and feeding method were used to determine the direct lethality of three insecticides,chlorantraniliprole,chlorfenapyr and acetamiprid,on the eggs,newly hatched larvae and mature larvae of Assara inouei,and their influence on the pupation and emergence of subsequent developmental stages.The results showed that 20% acetamiprid WP 8 000 times solution could significantly reduce the hatching rate of eggs,and the hatching rate of eggs decreased by 48.54% compared with the control;5% chlorantraniliprole and 10% chlorfenapyr had a poor inhibitory effect on egg hatching.The mortality rate of 5% chlorantraniliprole SC 1 000 times solution after treatment of newly hatched larvae for 72 h was 77.82%,which was significantly higher than those of the treatments with the other two insecticide;The pupation rate of the surviving larvae and emergence rate of adult were reduced by 63.54% and 42.07%,respectively,compared with the control,and were significantly lower than those of the treatments with the other two insecticide.10% chlorfenapyr SC 1 500 times solution treatment of mature larvae,the mortality rate after 24 h was 76.21%,and the mortality rate after 72 h was 81.06%,which was significantly higher than those of the concentration treatments of the other two insecticide;The
pupation rate of the surviving larvae and emergence rate of adult were significantly lower than those of the treatments with 20% acetamiprid WP,but there was no significant difference with 5% chlorantraniliprole SC 1 000 times solution treatment.These results indicate that 5% chlorantraniliprole has high insecticidal activity against newly hatched larvae,and has a good inhibitory effect on the pupation and emergence of subsequent developmental stages;10% chlorfenapyr has higher fast-acting insecticidal activity against mature larvae;The ovicidal effect of 20% acetamiprid is better than 5% chlorantraniliprole and 10% chlorfenapyr,but has low activity against larvae.