食诱剂与低剂量氯虫苯甲酰胺混配对棉铃虫种群的控制作用

食诱剂可以同时引诱棉铃虫雌、雄成虫，对其田间种群的防治效果明显。在撒施应用中，氯虫苯甲酰胺常被用作棉铃虫食诱剂的伴施杀虫剂，现阶段推荐使用浓度为0.5 μL/mL。本文测定了食诱剂与低剂量氯虫苯甲酰胺混配对棉铃虫成虫繁殖力及卵孵化率的影响，同时评估了其田间防治效果。在室内，氯虫苯甲酰胺浓度为0.25、0.125、0.0625 μL/mL的食诱剂对棉铃虫雌成虫的致死率分别为75.81%、67.01%和60.24%。以氯虫苯甲酰胺浓度0.25、0.125 μL/mL的食诱剂饲喂棉铃虫雌成虫，其存活个体的繁殖系数较未取食杀虫剂的对照组分别下降95.39%和91.61%。在田间罩笼中，提供相同数量的棉铃虫成虫，无论是仅雌成虫取食氯虫苯甲酰胺浓度为0.25 μL/mL的食诱剂，还是雌、雄成虫均进行取食，田间落卵量较未取食氯虫苯甲酰胺的对照组平均下降73.56%，后代幼虫发生量平均减少75.55%。因此，食诱剂与低剂量氯虫苯甲酰胺混配对棉铃虫成虫及其后代种群有明显控制作用，为棉铃虫食诱剂撒施中伴施杀虫剂氯虫苯甲酰胺的减量使用提供了科学依据。

Control Efficacy of Food Attractant Combined with Low Dose Chlorantraniliprole on Helicoverpa armigera Population

Food attractant for Helicoverpa armigera (Hübner) can achieve a significant control efficacy on field pest population due to its attractiveness to both female and male adults. Chlorantraniliprole is used at 0.5 μL/mL in combination with food attractant for controlling H. armigera. In this paper, the effects of attractant added with low dose of chlorantraniliprole on fecundity and egg hatching rate of H. armigera were measured, and the field control efficacy was evaluated. In laboratory, attractant with chlorantraniliprole exhibited high levels of toxicity to females, with mortalities of 75.8%, 67.0% and 60.2% at concentrations of 0.25, 0.125 and 0.0625 μL/mL, respectively. The reproduction coefficient was significantly reduced by 91.4% and 85.1% in the females exposed to the attractant with chlorantraniliprole at 0.25 and 0.125μL/mL, respectively, than in the control females. In field cage trials, egg and larva density in peanut was decreased by 73.6% and 75.6%, respectively, when females alone or both sexes were exposed to the attractant with chlorantraniliprole at 0.25 μL/mL. Therefore, lower dose of chlorantraniliprole combined with food attractant could provide significant control of H. armigera adults and their offspring populations. The results also provide scientific basis for reducing chlorantraniliprole dose in the application of H. armigera food attractants.