College of Plant Protection, Key Laboratory of Pesticide Toxicology & Application Technique, Shandong Agricultural University, Tai'an, 271018, Shandong, PR China.
Research Center of Pesticide Environmental Toxicology, Shandong Agricultural University, Tai'an, 271018, Shandong, PR China.
Ecotoxicol Environ Saf. 2019 Nov 15;183:109587. doi: 10.1016/j.ecoenv.2019.109587. Epub 2019 Aug 28.
Compatibility of neonicotinoid insecticides with the natural enemies has been concerned for decades. This study aims to evaluate and compare the acute and sublethal toxicity effects of neonicotinoid insecticides on three species of Trichogramma parasitoid wasps (i.e. Trichogramma dendrolimi, T. ostriniae and T. confusum) with broad distribution and great relevance to integrated pest management (IPM) strategies. A residual contact bioassay demonstrated that nitenpyram had the greatest intrinsic toxicity to T. dendrolimi and T. ostriniae with LC values of 0.060 (0.056-0.065) and 0.066 (0.050-0.087) mg a.i. L, respectively. But for T. confusum, the most toxic neonicotinoid insecticide is dinotefuran with a LC value of 0.065 (0.055-0.078) mg a.i. L. Furthermore, based on the risk quotient estimation, acetamiprid was considered to be the only safe neonicotinoid insecticide (Class 1, RQ＜50). A dipped egg contact bioassay showed that neonicotinoid insecticides induced significant toxic effects on the parasitism of three Trichogramma spp. at low-lethal concentrations. Additionally, emergence probability of the unexposed offspring was also significantly reduced by neonicotinoids. According to the estimated EC values, acetamiprid possessed the least toxicity to the parasitism and emergence of T. dendrolimi and T. ostriniae, and for T. confusum, the least toxic neonicotinoid insecticide was thiacloprid. Overall, among the test neonicotinoid insecticides, acetamiprid and thiacloprid may exhibit the less ecotoxicity to the test Trichogramma species.
新烟碱类杀虫剂与天敌的相容性已引起关注数十年。本研究旨在评估和比较新烟碱类杀虫剂对三种广泛分布且与综合虫害管理（IPM）策略密切相关的 Trichogramma 寄生蜂（即 Trichogramma dendrolimi、T. ostriniae 和 T. confusum）的急性和亚致死毒性效应。残留接触生物测定表明，吡虫啉对 T. dendrolimi 和 T. ostriniae 的内在毒性最大，LC 值分别为 0.060（0.056-0.065）和 0.066（0.050-0.087）mg a.i. L。但对于 T. confusum，最毒的新烟碱类杀虫剂是噻虫嗪，LC 值为 0.065（0.055-0.078）mg a.i. L。此外，根据风险商估计，噻虫胺被认为是唯一安全的新烟碱类杀虫剂（1 类，RQ＜50）。浸渍卵接触生物测定表明，新烟碱类杀虫剂在低致死浓度下对三种 Trichogramma spp. 的寄生作用产生了显著的毒性效应。此外，新烟碱类杀虫剂还显著降低了未暴露后代的出蜂率。根据估计的 EC 值，噻虫胺对 T. dendrolimi 和 T. ostriniae 的寄生和出蜂毒性最小，而对于 T. confusum，毒性最小的新烟碱类杀虫剂是噻虫啉。总体而言，在所测试的新烟碱类杀虫剂中，噻虫胺和噻虫啉可能对测试的 Trichogramma 物种表现出较小的生态毒性。
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