Instituto de Investigaciones Agropecuarias y Forestales, Universidad, Michoacana de San Nicolás de Hidalgo, 58880 Tarímbaro, Michoacín, Mexico.
J Econ Entomol. 2010 Jun;103(3):662-7. doi: 10.1603/ec09244.
The toxicity and sublethal effects of methoxyfenozide were evaluated in third instars of the beet armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), that fed on contaminated semisynthetic diet. The LC50 value was estimated at 0.23 mg of active ingredient (AI) /kg diet (range, 95% CI: 0.17-0.37) at 264 h after treatment. The effects on development, survival, and reproduction were observed in third instars of this pest that survived exposure to an LC25 concentration of methoxyfenozide. The larvae from the insecticide treatment exhibited lower pupal weights, an increase in both larval and pupal developmental times and a higher frequency of malformations of the wings in adults than untreated larvae. Adults from the methoxyfenozide treatment did not show reduced fecundity (mean cumulative number of eggs laid per female), but fertility as measured by the percentage of eggs hatched (fertility) was significantly reduced compared with untreated control insects. No significant effects were observed on pupal sex ratio. We concluded that the lethal and sublethal effects of methoxyfenozide are likely to have a significant impact on S. exigua populations on treated crops.
甲氧虫酰肼对甜菜夜蛾（Spodoptera exigua）三龄幼虫的毒性和亚致死效应进行了评估，这些幼虫取食受污染的半合成饲料。处理后 264 小时，LC50 值估计为 0.23 毫克有效成分（AI）/kg 饮食（范围，95%置信区间：0.17-0.37）。在接触 LC25 浓度甲氧虫酰肼的幸存幼虫中观察到对发育、存活和繁殖的影响。与未处理的幼虫相比，来自杀虫剂处理的幼虫蛹重较低，幼虫和蛹的发育时间增加，成虫翅膀畸形的频率更高。与未处理的对照昆虫相比，来自甲氧虫酰肼处理的成虫的繁殖力（产卵量的累积百分比）没有降低，但产卵孵化率（生育率）显著降低。未观察到蛹的性别比例有显著影响。我们得出结论，甲氧虫酰肼的致死和亚致死效应可能对处理作物上的甜菜夜蛾种群产生重大影响。
