氯虫苯甲酰胺与甲维盐复配对玉米田草地贪夜蛾的防效

Control Efficacy and Joint Toxicity of Chlorantraniliprole Mixed with Emamectin Benzoate Against Spodoptera frugiperda in Corn

草地贪夜蛾是一种重要的外来入侵害虫,已对我国玉米产业造成巨大的经济损失。化学农药对草地贪夜蛾的速效性好,但大量使用会导致其产生抗药性;生物农药对其速效性较差,不易产生抗药性且环境兼容性好。为此,于室内利用浸虫法测定了氯虫苯甲酰胺与甲氨基阿维菌素苯甲酸盐(简称甲维盐)复配对玉米草地贪夜蛾的联合毒力,并于2021年采用田间小区试验评价了5%氯虫苯甲酰胺悬浮剂、5%甲维盐微乳剂及其增效组合物叶面喷雾处理对玉米田草地贪夜蛾的防治效果。结果表明:氯虫苯甲酰胺与甲维盐复配剂以7∶1的质量比复配对草地贪夜蛾2龄幼虫具有最高的增效作用,其共毒系数为136%;氯虫苯甲酰胺悬浮剂与5%甲维盐微乳剂现混现用时,以40+5.5 mL/667m^(2)处理对玉米田草地贪夜蛾的防治效果最佳,药后1~14 d的防治效果高达87.43%~98.10%。这说明氯虫苯甲酰胺与甲维盐复配不仅可实现化学农药减量使用的目标,而且还能有效控制玉米草地贪夜蛾危害。

The fall armyworm(FAW),Spodoptera frugiperda,is one of the most dangerous invasive pests,and has caused huge economic losses on corn industry.Chemical pesticides show quick-action to FAW and easily result in FAW resistance due to their frequent application.Biopesticides are environment-friendly and difficult to incur tolerance,but slow-action to FAW.Therefore,joint toxicity of chlorantraniliprole plus emamectin benzoate to FAW was determined by the larvae-dipping method in the laboratory;on the other hand,a field plot experiment was conducted to evaluate the control efficacy of chlorantraniliprole 5%SC,emamectin benzoate 5%ME,and their mixtures by foliar spray in 2021.The results showed that in the laboratory test,a 7∶1 mass ratio of chlorantraniliprole and emamectin benzoate exhibited the highest synergistic toxicity to second instar larvae of FAW,with a co-toxicity coefficient of 136%.For the field foliar spray,the mixtures of chlorantraniliprole 5%SC and emamectin benzoate 5%ME achieved the optimal efficacy of 87.43%-98.10%at the dosage of 600+82.5 mL/hm^(2)across 1-14 days after treatment.Overall,the mixtures of chlorantraniliprole and emamection benzoate can not only achieve the reduced application of chemical pesticides,but also effectively control the damage of FAW on corn.