几种药剂对铜绿丽金龟的杀卵作用研究

Toxic Effects of Several Insecticides on the Egg of Anomala corpulenta Motschulsky

为筛选对金龟甲卵毒力高、持续控制效果好的药剂,采用毒土法测定了几种代表性药剂对铜绿丽金龟卵的毒力及对不同发育时期卵的毒力差异,并评价了药剂对卵的持续杀卵作用及综合控制效果。结果表明,虫酰肼的杀卵活性最高,LC_(50)为8.620 mg/kg,噻虫胺、吡虫啉和噻虫嗪次之,LC_(50)分别为15.776、19.249和22.669 mg/kg,毒力均高于常用药剂辛硫磷;而氯虫苯甲酰胺和氟虫腈的毒力较低。药剂对不同时期卵毒力以对1日龄卵的毒力最高,对5日龄卵次之,对9日龄卵的毒力最低。3种药剂卵期处理的综合防效及持效性以噻虫胺最好,以有效成分33.33mg/kg处理30d时,综合防效仍达95.88%;虫酰肼次之,以有效成分33.33mg/kg处理20 d时综合防效为75.00%;辛硫磷最差。因此,噻虫胺用于防治花生田铜绿丽金龟甲具有好的推广应用价值。

Toxicity of some insecticides to the egg of white grub, Anomala corpulenta Motschul- sky, was determined with the method of loam mixed insecticide, and the toxicity of insecticides to the eggs at different stages was compared. Meantime, the lasting effect and comprehensive control effect were evaluated. The result showed that tebufenozide had the highest toxicity with a LC50 of 8. 620 mg/kg. Based on the LC50 values, the order of toxicity levels of the seven insecticides tested against the egg of A. corpulenta was as follows： tebufenozide 〉clothianidin 〉 imidacloprid 〉 thiamethoxam 〉 phoxim （the control insecticide） 〉 chlorantraniliprole 〉 fipronil. And the order of toxicity levels of insecticides to the egg at different stages was as follows： 1-day-egg 〉 5-day-egg〉 9-day-egg. The lasting combined effects of clothianidin was the highest among 3 kinds of insecticides. The control of clothianidin reached 95.88% at a dose of 33.33 mg a. i./kg after treated for 30 days. And at the same dose, the tebufenozide control effect on egg and larvae reached 75.00% after treaded for 20 days. However, the control effect of phoxim was the lowest. So, the clothianidin is worth applying to the peanut field at the egg stage of A. corpulenta.