Demographic Changes in Multigeneration Plutella xylostella (Lepidoptera: Plutellidae) After Exposure to Sublethal Concentrations of Spinosad
Demographic Changes in Multigeneration Plutella xylostella (Lepidoptera: Plutellidae) After Exposure to Sublethal Concentrations of Spinosad
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DOI：
10.1603/029.102.0146
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发表时间：
2009-02
期刊：
影响因子：
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通讯作者：
Yin Xian-Hui;Qing-jun Wu;L. Xue-feng;Zhang You-jun;Bao-yun Xu
中科院分区：
文献类型：
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作者：
Yin Xian-Hui;Qing-jun Wu;L. Xue-feng;Zhang You-jun;Bao-yun Xu
摘要研究了多杀菌素对小菜蛾Plutella xylostella（L.）（鳞翅目：Plutellidae）通过使用人口统计方法。结果数据进行了分析的基础上的年龄阶段和两性生命表模型。生测结果表明，经LC 25多杀菌素筛选10代后，小菜蛾对多杀菌素的敏感性降低。与多杀菌素敏感品系SS相比，虽然Sub-1（经LC 25多杀菌素选择1代）的卵大小显著较小，但Sub-5（经LC 25多杀菌素选择5代）的卵大小恢复到正常水平，Sub-10（经LC 25多杀菌素选择10代）的卵大小甚至更大。不同世代的亚株生活史参数发生变化。亚致死多杀菌素对Sub-1有显著影响;然而，随着选择周期的增加，对Sub菌株的亚致死效应降低。Sub-1的内禀增长率（rm）、有限增长率（rm）和净繁殖率（R 0）均显著低于SS株。Sub-5和Sub-10与SS株相比无显著差异。最大的差异是每只雌性产卵的总数，即，繁殖力SS、Sub-1、Sub-5和Sub-10的繁殖力分别为121.92、81.26、114.42和159.21。SS、Sub-1、Sub-5和Sub-10蛋的预期寿命分别为10.58、8.71、10.21和7.45 d。
ABSTRACT The sublethal effects of the insecticide spinosad were assessed against Plutella xylostella (L.) (Lepidoptera: Plutellidae) by using a demographic approach. The resulting data were analyzed based on the age-stage and two-sex life table model. Bioassay results showed that the susceptibility of P. xylostella to spinosad decreased in Sub strains selected by LC25 spinosad for 10 generations. Although the egg size was significantly smaller in Sub-1 (selected by LC25 spinosad for one generation) compared with spinosad-susceptible strain SS, egg size recovered to normal levels in Sub-5 (selected by LC25 spinosad for five generations) and were even larger in Sub-10 (selected by LC25 spinosad for 10 generations). The life-history parameters changed in the Sub strains of different generations. Sublethal spinosad had a significant effect on Sub-1; however, the sublethal effect on the Sub strains decreased as selection cycles increased. The intrinsic rate of increase (r m), finite rate of increase () and net reproductive rate (R 0) in Sub-1 were significantly decreased compared with those in the SS strain. No significant differences were found between the Sub-5 or Sub-10 compared with the SS strain. The greatest difference was observed in the total number of eggs laid by each female, i.e., the fecundity. The fecundity in SS, Sub-1, Sub-5, and Sub-10 were 121.92, 81.26,114.42, and 159.21, respectively. The life expectancy of an SS, Sub-1, Sub-5, and Sub-10 egg was 10.58, 8.71, 10.21, and 7.45 d, respectively.