Abstract

In this research, we evaluated sublethal effects of five commercial insecticides of fenvalerate, propargite, buprofezin, dayabon and palizin which are used in chemical control of target pests of Habrobracon hebetor Say (an idiobiont and gregarious ectoparasitoid), on the functional response of this important biocontrol agent. First, 80 mated females of H. hebetor were treated by LC₃₀ of selected insecticides for 24 h. Then, among them six wasps were selected and introduced to different densities of Ephestia kuehniella Zeller larvae (flour moth, an economical stored pest of cereals) for 24 h. The regression analyses based on Holling model indicated the functional response type II in the control, palizin and buprofezin and type III in fenvalerate, propargite and dayabon. Moreover, the highest and lowest attack rates were obtained in palizin and fenvalerate treatments, respectively. In addition, the treated wasps by dayabon and fenvalerate showed the shortest and longest handling times, respectively. Accordingly, palizin and dayabon due to the lowest negative effects on H. hebetor are compatible insecticides for combination with this biocontrol agent in integrated pest management.

摘要

在这项研究中，我们评估了 fenvalerate、propargite、buprofezin、dayabon 和 palizin 等五种商业杀虫剂的亚致死效应，这些杀虫剂用于化学防治Habrobracon hebetor Say（一种成群的群居外寄生蜂）的目标害虫，对这一重要的功能反应的影响。生物防治剂。首先，用选定杀虫剂的 LC ₃₀处理80 只已交配的H. hebetor雌性24 小时。然后，从中挑选出六只黄蜂，并将其引入不同密度的Ephestia kuehniellaZeller 幼虫（面粉蛾，一种经济的谷物储藏害虫）24 小时。基于Holling模型的回归分析表明，对照组、palizin和buprofezin的功能反应类型为II，而fenvalerate、propargite和dayabon的功能反应类型为III。此外，palizin 和fenvalerate 治疗分别获得最高和最低的发病率。此外，dayabon 和fenvalerate 处理的黄蜂分别表现出最短和最长的处理时间。因此，由于对H. hebetor 的负面影响最小，palizin 和 dayabon是可与这种生物防治剂组合用于害虫综合治理的相容杀虫剂。