ABSTRACT The insect growth regulators (IGRs) chlorfluazuron, flufenoxuron and pyriproxyfen were evaluated, using the leaf-dip technique, on the various developmental and reproductive aspects of Spodoptera littoralis in the parental generation (P), first filial generation (F1) and second filial generation (F2). Additionally, the effect of these IGRs on nutritional indices was also evaluated. The effect on development and reproduction was IGR and generation dependent, with a profound negative impact in the case of the P generation treated with chlorfluazuron. In all treatments, fecundity and fertility increased progressively from the P generation to the F2 generation, and thereby both approached those of the controls. The change in nutritional indices was found to be a function in the candidate IGR and age of the same instar larvae, with a drastic change in late last larval instar (3-day-old 6th larval instar), particularly in the case of treatment with chlorfluazuron. Furthermore, toxicity and morphological deformities induced by the IGRs were reported. The overall results suggest that the IGRs under investigation, particularly chlorfluazuron, interfere with the development process and have the potential for S. littoralis control.

中文翻译：

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昆虫生长调节剂对埃及棉叶虫 Spodoptera littoralis（鳞翅目：夜蛾科）发育、繁殖和营养指标的抑制作用

摘要 昆虫生长调节剂（IGRs）氟虫脲、氟虫脲和吡丙醚使用浸叶技术，对斜纹夜蛾在亲代（P）、第一代（F1）和第二代的各种发育和繁殖方面进行了评估。代（F2）。此外，还评估了这些 IGR 对营养指数的影响。对发育和繁殖的影响取决于 IGR 和代，对用氟虫脲处理的 P 代产生深远的负面影响。在所有处理中，从 P 代到 F2 代，繁殖力和生育力逐渐增加，从而都接近对照。发现营养指数的变化与候选 IGR 和同一龄期幼虫的年龄有关，在末龄幼虫（3 日龄第 6 龄幼虫）发生剧烈变化，特别是在用氟虫脲治疗的情况下。此外，报告了由 IGR 引起的毒性和形态畸形。总体结果表明，正在调查的 IGR，尤其是氟虫脲，会干扰发育过程并具有控制滨海沙门氏菌的潜力。