Department of Plant Protection, Faculty of Agriculture, Yasouj University, Yasouj, Iran.
Department of Plant Protection, Faculty of Agriculture, University of Tabriz, Tabriz, Iran.
J Econ Entomol. 2020 Dec 9;113(6):2723-2731. doi: 10.1093/jee/toaa214.
A combination of pesticides and biological control agents is frequently necessary to achieve successful pest management requiring the assessment of their compatibility for the intended purpose. Aphidius flaviventris Kurdjumov is one of the parasitoids of the cotton aphid Aphis gossypii Glover, whose susceptibility to pesticides was not yet investigated. Accordingly, we investigated the lethal and sublethal effects of the commonly utilized insecticide mixture thiacloprid + deltamethrin on the cotton aphid and its parasitoid wasp Aphidius flaviventris. The estimated LC50 for the aphid was 14.1 mg ai/l; the effects of sublethal exposure at LC10 (2.80 mg ai/l) and LC30 (7.28 mg ai/l) on the aphid life-table parameters led to significantly increase on the development time of third- and fourth-instar nymphs and preadult. Sublethal exposure to the insecticide mixture compromised aphid longevity, fecundity, and life-table parameters (r, R0, and T). Moreover, population growth and parasitism rate of the parasitoid were significantly compromised at both concentrations of the insecticide mixture under sublethal exposure. These results not only indicate the efficacy of thiacloprid + deltamethrin against the cotton aphid, but also raise concerns regarding its negative impacts on the parasitoid Aphidius flaviventris and caution against its use in pest management programs.
一种杀虫剂和生物防治剂的组合通常是实现成功的害虫管理所必需的，这需要评估它们是否适合预期目的。黄野螟茧蜂是棉蚜的一种寄生蜂，尚未研究其对杀虫剂的敏感性。因此，我们研究了常用杀虫剂混合物噻虫啉+溴氰菊酯对棉蚜及其寄生蜂黄野螟茧蜂的致死和亚致死效应。估计棉蚜的 LC50 为 14.1mg ai/l；亚致死浓度 LC10（2.80mg ai/l）和 LC30（7.28mg ai/l）暴露对棉蚜生命表参数的影响导致第三和第四龄若虫及预成虫的发育时间显著延长。亚致死浓度的杀虫剂混合物暴露会影响棉蚜的寿命、繁殖力和生命表参数（r、R0 和 T）。此外，在亚致死浓度下，寄生蜂的种群增长和寄生率均显著受到杀虫剂混合物的影响。这些结果不仅表明噻虫啉+溴氰菊酯对棉蚜有效，而且还对其对寄生蜂黄野螟茧蜂的负面影响表示担忧，并警告不要在害虫管理计划中使用它。
