不同地区甜菜夜蛾的抗药性及田间防效

Resistance Monitoring and Field Efficacy of Different Insecticides to Spodoptera exigua(Hübner)

在建立甜菜夜蛾对11种杀虫剂敏感毒力基线的基础上,采用浸叶法监测了4个甜菜夜蛾田间种群对11种杀虫剂的抗性水平,并评价了8种杀虫剂的田间防效。结果表明,甜菜夜蛾4个田间种群对多杀霉素和灭多威敏感,对甲氧虫酰肼、虫螨腈和茚虫威处于低至中等抗性水平,对毒死蜱处于中等水平抗性,对氟啶脲、氯虫苯甲酰胺和唑虫酰胺处于中等至高水平抗性,对甲氨基阿维菌素苯甲酸盐和高效氯氰菊酯处于高水平抗性。田间药效试验结果表明,10%虫螨腈悬浮剂对甜菜夜蛾的防治效果较好,防效在73.62%~92.97%之间,药后3 d达到最高防效;其次是50 g·L^(-1)氟啶脲乳油、24%甲氧虫酰肼悬浮剂和150 g·L^(-1)茚虫威悬浮剂,最高防效均超过80%;15%唑虫酰胺悬浮剂和5%氯虫苯甲酰胺悬浮剂的防效一般,最高防效分别为71.70%和70.55%;4.5%高效氯氰菊酯乳油和5.7%甲氨基阿维菌素苯甲酸盐微乳剂的防效较差,最高防效均未超过50%。

On the basis of establishing the baseline of susceptibility of Spodoptera exigua(Hübner)to 11 insecticides,the resistance levels of 4 field populations to 11 insecticides were detected by leaf-dipping method,and the control efficacy of 8 insecticides against S.exigua were evaluated in field trails.The results showed that the 4 tested S.exigua populations remained susceptible to spinosad and methomyl,while developed varying degrees of resistance to other tested insecticides as follows:low to moderate resistance to methoxyfenozide,chlorfenapyr and indoxacarb,moderate resistance to chlorpyrifos,moderate to high resistance to chlorfluazuron,chlorantraniliprole and tolfenpyrad,and high resistance to emamectin benzoate and beta-cypermethrin.The results of the field efficacy showed that the control efficacy of chlorfenapyr 10%SC against S.exigua ranging from 73.62%to 92.97%,and the highest control efficacy appeared on the third day after treatment.The following were chlorfluazuron 50 g·L^(-1) EC,methoxyfenozide 24%SC and indoxacarb 150 g·L^(-1) SC,all with the highest control efficacy exceeding 80%.The highest control efficacy of tolfenpyrad 15%SC and chlorantraniliprole 5%SC were 71.70%and 70.55%respectively.The control efficacy of betacypermethrin 4.5%EC and emamectin benzoate 5.7%ME had the lowest control effect,with the maximum control efficacy less than 50%.