吡虫啉亚致死剂量对桃蚜实验种群的胁迫效应

室内测定了吡虫啉亚致死剂量对桃蚜F0代成蚜的干扰作用，同时通过组建吡虫啉亚致死剂量胁迫下桃蚜F1代的实验种群生命表，利用生命表参数、种群趋势指数（I）以及干扰作用控制指数（IIPC）系统分析了吡虫啉对桃蚜的胁迫效应。结果表明，吡虫啉亚致死剂量对桃蚜室内种群F0代成蚜的胁迫效应主要表现为降低繁殖力与缩短成蚜寿命；对F1代的胁迫效应表现为降低种群的内禀增长率、净增殖率和周限增长率，延长平均世代历期和种群加倍时间，以及压低种群趋势指数。吡虫啉亚致死剂量胁迫下对桃蚜实验种群的干扰作用控制指数均小于1。研究结果说明吡虫啉亚致死剂量对桃蚜具有持续控制作用，不存在刺激桃蚜增殖的现象。

Impact of Sublethal Doses of Imidacloprid on Experimental Population of Myzus Persicae

Laboratory experiments were conducted to assess the impact of sublethal doses of imidacloprid for adult aphid of F0 generation, and the impact of sublethal doses of imidacloprid on Myzus persicae was assessed by comparison of life table parameters, population trend index (I) and the interfering indexes of population control (IIPC) through the constructing of the life table of the experimental population for F1 generation. The results showed the impact of sublethal doses of imidacloprid on adult aphid of F0 generation mostly shortened longevity and depressed the total fecundity; The effects of sublethal doses of imidacloprid on F1 generation were depressing rm、R0 and λ, prolonging Td and td as well as reducing I. The values of IIPC were all less than 1. The results suggested that the sublethal doses of imidacloprid have the sustainable control function to M. persicae, and no stimulating of reproduction for M. persicae was existed.