Department of Entomology, College of Agriculture, Indira Gandhi Krishi Vishwavidyalaya, Raipur, India.
Crop Protection Division, ICAR - National Rice Research Institute, Cuttack, India.
Pest Manag Sci. 2023 Oct;79(10):3656-3665. doi: 10.1002/ps.7540. Epub 2023 May 24.
The effectiveness of a biological control agent depends on how well it can control pests and how compatible it is with pesticides. Therefore, we reported the multigenerational effect of a commonly used insecticide, imidacloprid, on the functional response of a widely acclaimed egg parasitoid, Trichogramma chilonis Ishii, to different densities of the host Corcyra cephalonica Stainton eggs. The study investigated the outcomes of the median lethal concentration (LC ) and sublethal concentrations (LC , LC ), along with control treatments for five continuous generations (F to F ).
The results showed that the F generation of LC , both of the F and F generations of LC , and the control all had a Type II functional response. A Type I functional response was exhibited for the F generation of LC and both generations of LC . The attack rate on host eggs treated with LC and LC did not change (decrease) with the shift in the type of functional response as compared to the control. A significant increase in the searching efficiency (a) was observed in the later generation (F ) under the exposure of LC and LC imidacloprid concentrations. A lower handling time (T ) in both generations of the LC followed by LC treated individuals was observed when compared with the control and LC treatments. The per capita parasitization efficiency (1/T ) and the rate of parasitization per handling time (a/T ) were also considerably higher in both the generations of LC and LC than in the control and LC , thereby implying positive effects of imidacloprid on the parasitization potential of T. chilonis.
Altogether, these multigenerational outcomes on the functional response of T. chilonis could be leveraged to control the intractable lepidopteran pests under the mild exposure of imidacloprid in integrated pest management (IPM) programs as well as in the mass rearing of the parasitoid, T. chilonis. © 2023 Society of Chemical Industry.
生物防治剂的效果取决于其控制害虫的能力以及与杀虫剂的兼容性。因此，我们报告了一种常用杀虫剂吡虫啉对广受赞誉的卵寄生蜂赤眼蜂（Trichogramma chilonis Ishii）对不同密度的寄主油桃螟（Corcyra cephalonica Stainton）卵的功能反应的多代效应。该研究调查了五个连续世代（F 到 F ）的中致死浓度（LC ）和亚致死浓度（LC 、LC ）以及对照处理的结果。
结果表明，F 代 LC 、F 和 F 代 LC 和对照均表现出 II 型功能反应。F 代 LC 和 LC 表现出 I 型功能反应。与对照相比，用 LC 和 LC 处理的寄主卵的攻击率没有随着功能反应类型的变化而改变（减少）。在 LC 和 LC 暴露下，后期世代（F ）的搜索效率（a）显著增加。与对照和 LC 处理相比，LC 和 LC 处理个体的处理时间（T）在两代均降低。LC 和 LC 处理个体的每头寄生效率（1/T）和每处理时间寄生率（a/T）也显著高于对照和 LC ，这表明吡虫啉对赤眼蜂的寄生潜力有积极影响。
总之，这些关于赤眼蜂功能反应的多代结果可用于在综合虫害管理（IPM）计划中以及在大量繁殖赤眼蜂时，在温和暴露于吡虫啉的情况下控制难以控制的鳞翅目害虫。 © 2023 化学工业协会。
