湖南甜瓜瓜绢螟种群动态及杀虫剂田间防治效果评价

Population dynamics of Diaphania indica(Saunders)in melon fields and efficacy test of six insecticides in Hunan

为明确湖南甜瓜瓜绢螟[Diaphania indica(Saunders)]的发生规律及筛选控制该害虫的高效药剂,连续3年调查了长沙县钢架大棚内甜瓜瓜绢螟种群数量,并采用田间小区试验评价了6种杀虫剂喷施处理对其防治效果。结果表明,湖南甜瓜瓜绢螟幼虫在5月底至6月初发生,7—10月为发生高峰期。60 g·L^(-1)乙基多杀菌素SC、150 g·L^(-1)茚虫威SC和32000 IU·mg^(-1)苏云金杆菌G033A WP均能有效控制甜瓜瓜绢螟,药后7 d的防治效果分别为100.00%、95.15%和82.49%,且3种药剂之间防治效果差异不显著;2%甲氨基阿维菌素苯甲酸盐EC和5%氯虫苯甲酰胺SC对甜瓜瓜绢螟控制作用较差,药后7 d的防治效果分别为48.07%和41.43%;25 g·L^(-1)高效氯氟氰菊酯EC对甜瓜瓜绢螟无效。综上所述,在甜瓜瓜绢螟发生初期,选用乙基多杀菌素、茚虫威或苏云金杆菌喷雾,可有效控制其危害。

To understand the occurrence regular of the melon borer,Diaphania indica(Saunders)in Hunan province and select effective insecticides for control of this pest,its population dynamics were investigated in plastic house in Changsha County for three years,and field plot experiment was conducted to evaluate the efficacy of six insecticides.D.indica first occurred at the end of May to the beginning of June,and peaked from July to October.Spinetoram 60 g·L^(-1) SC,indoxacarb 150 g·L^(-1) SC and Bacillus thuringiensi(Bt)32000 IU·mg^(-1) WP effectively controlled this pest with efficacies of 100.00%,95.15%and 82.49%,respectively,at 7 days after spray application,and no statistical difference among them.Emamectin benzoate 2%EC and chlorantraniliprole 5%SC had lower efficacies of 48.07%and 41.43%at 7 days after treatment.Lambda-cyhalothrin 25 g·L^(-1) SC didn’t work against D.indica.In summary,spinetoram,indoxacarb and Bt foliar sprays are recommended to effectively control D.indica during its initial occurrence period.