200 g/L四唑虫酰胺悬浮剂对灰茶尺蠖的田间防治效果

Field control effects of 200 g/L tetraniliprole SC on Ectropis grisescens Warren

为探究200 g/L四唑虫酰胺悬浮剂对灰茶尺蠖(Ectropis grisescens Warren)的田间防治效果及安全性,于2021年8月、9月进行2次田间药效试验,选用常用农药30%唑虫酰胺悬浮剂、240 g/L虫螨腈悬浮剂、25 g/L联苯菊酯乳油作为对照,对四唑虫酰胺防治灰茶尺蠖的效果进行研究与评价。结果表明,喷施农药后3 d,2次试验200 g/L四唑虫酰胺悬浮剂90~150 mL/hm2防治效果分别为84.29%~89.44%、69.40%~78.69%;喷施农药后7 d,2次试验200 g/L四唑虫酰胺悬浮剂90~150 mL/hm2防治效果分别为94.81%~97.71%、86.28%~94.36%;喷施农药后14 d,2次试验200 g/L四唑虫酰胺悬浮剂90~150 mL/hm2防治效果分别为84.82%~87.89%、80.14%~85.40%;在8月、9月3龄以内幼虫占比分别为90.74%、32.55%的条件下,2次试验200 g/L四唑虫酰胺悬浮剂防治效果、速效性、持效性均优于对照药剂唑虫酰胺、虫螨腈、联苯菊酯,且8月防治效果明显高于9月。200 g/L四唑虫酰胺悬浮剂能够有效防治茶园灰茶尺蠖,浓度为90~150 mL/hm2对茶树生长安全。在灰茶尺蠖幼虫3龄内采取喷药措施防治效果更佳。

In order to explore the field control effects and safety of 200 g/L tetraniliprole suspension concentrate(SC)on Ectropis grise⁃scens Warren,two field efficacy trials were conducted in August and September 2021.The field control effects of tetraniliprole on Ect⁃ropis grisescens Warren were studied and evaluated by using 30%tolfenpyrad SC,240 g/L chlorfenapyr SC and 25 g/L bifenthrin emul⁃sifiable concentrate(EC)as control.The results showed that 3 days after spraying pesticide,the field control effects of 200 g/L tetra⁃niliprole SC 90~150 mL/hm2 were 84.29%~89.44%,69.40%~78.69%in two experiments,respectively.7 days after spraying pesti⁃cide,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 in⁃star in August and September was 90.74%and 32.55%,respectively,the control effects of 200 g/L tetraniliprole SC in two experi⁃ments were better than those of the control agents,tolfenpyrad,chlorfenapyr and bifenthrin,and the control effects in August were sig⁃nificantly 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 Ectro⁃pis grisescens Warren larvae was better.