Department of Bioassay, Central Agricultural Pesticides Laboratory, Agricultural Research Center, 12618, Giza, Egypt.
Department of Standard Rearing, Central Agricultural Pesticides Laboratory, Agricultural Research Center, 12618, Giza, Egypt.
Ecotoxicology. 2022 Aug;31(6):909-918. doi: 10.1007/s10646-022-02556-0. Epub 2022 May 26.
With low-dose stimulation and high-dose inhibition, insecticide-induced hormesis, a biphasic phenomenon, can contribute to pest resurgence. The cowpea aphid, Aphis craccivora (Koch) (Homoptera: Aphididae), is a vital insect that infests legume crops. Its hormesis of flupyradifurone has not been previously established. Age-stage two-sex life analysis is used to investigate the sublethal and transgenerational effects of flupyradifurone on two successive generations of A. craccivora. A leaf-dip bioassay method revealed high toxicity of flupyradifurone against A. craccivora, with lethal concentration 50% value (LC) of 1.82 mg L after 48 h exposure. Treatment of parent generation (F) with LC and LC of flupyradifurone significantly increased the longevity and fecundity of the directly exposed adults. The results of transgenerational effects showed that the treatment of (F) with LC induced significant hormetic effects in progeny generation (F). Furthermore, flupyradifurone at LC significantly enhanced the biological traits, such as intrinsic rate of increase (r), finite rate of increase (λ), and net reproductive rate (R) compared with the control. Similarly, both LC and LC induced a significant increase in the mean generation time T (d). Conversely, both treatments caused a significant decrease in the doubling time (DT). Data in the present study demonstrate that the exposure of (F) to flupyradifurone at LC and LC enhanced longevity and fecundity in the directly exposed adults of A. craccivora, and induced transgenerational hormesis across the subsequent (F) generation. These results should be taken into consideration when using flupyradifurone for controlling cowpea aphid.
在低剂量刺激和高剂量抑制的情况下，杀虫剂诱导的激素作用是一种双相现象，可能导致害虫再次猖獗。豇豆蚜，Aphis craccivora（Koch）（同翅目：蚜科），是一种重要的昆虫，它侵害豆科作物。其对氟吡呋喃酮的激素作用尚未得到证实。利用龄期-两性生命分析方法研究了氟吡呋喃酮对连续两代 A. craccivora 的亚致死和跨代效应。叶浸生物测定方法表明，氟吡呋喃酮对 A. craccivora 具有高毒性，48 小时接触后致死浓度 50%（LC）值为 1.82mg/L。用 LC 和氟吡呋喃酮的 LC 处理亲代（F）代显著延长了直接暴露成虫的寿命和繁殖力。跨代效应的结果表明，用 LC 处理（F）代在后代（F）代中诱导了显著的激素作用。此外，与对照相比，LC 下的氟吡呋喃酮显著增强了内在增长率（r）、有限增长率（λ）和净生殖率（R）等生物学特征。同样，LC 和 LC 均使平均世代时间 T（d）显著增加。相反，两种处理均导致倍增时间（DT）显著减少。本研究的数据表明，（F）代暴露于 LC 和 LC 的氟吡呋喃酮可增强 A. craccivora 直接暴露成虫的寿命和繁殖力，并在随后的（F）代中诱导跨代激素作用。在使用氟吡呋喃酮防治豇豆蚜时，应考虑这些结果。
