Abstract: In order to explore the field control effects and safety of 200 g/L tetraniliprole suspension concentrate（SC） on Ectropis grisescens Warren, two field efficacy trials were conducted in August and September 2021. The field control effects of tetraniliprole on Ectropis grisescens Warren were studied and evaluated by using 30% tolfenpyrad SC, 240 g/L chlorfenapyr SC and 25 g/L bifenthrin emulsifiable concentrate（EC） as control. The results showed that 3 days after spraying pesticide, the field control effects of 200 g/L tetraniliprole SC 90~150 mL/hm² were 84.29%~89.44%, 69.40%~78.69% in two experiments, respectively. 7 days after spraying pesticide, the control effects of 200 g/L tetraniliprole SC 90~150 mL/hm² were 94.81%~97.71% and 86.28%~94.36% in two experiments, respectively. 14 days after spraying pesticide, the field control effects of 200 g/L tetraniliprole SC 90~150 mL/hm² were 84.82%~87.89% and 80.14%~85.40% in two experiments, respectively. Under the conditions that the proportion of larvae within the third instar in August and September was 90.74% and 32.55%, respectively, the control effects of 200 g/L tetraniliprole SC in two experiments were better than those of the control agents, tolfenpyrad, chlorfenapyr and bifenthrin, and the control effects in August were significantly higher than those in September. 200 g/L tetraniliprole SC could control Ectropis grisescens Warren in tea gardens effectively, and the concentration of 90~150 mL/hm² was safe on the growth of tea trees. The effect of spraying pesticide at the third instar of Ectropis grisescens Warren larvae was better.

Key words: tetraniliprole, Ectropis grisescens Warren, field control effects