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期 刊 ：植物保护学报 2011年

关键词：甲维盐；棉铃虫；亚致死剂量；生物学特性；生命表参数；

Keywords:emamectin benzoate, Helicoverpa armigera, sublethal dose, biological performance, life table parameters,

摘 要 ：以甲维盐亚致死剂量LC₂₅连续筛选棉铃虫10代获得一个亚致死种群(Sub₁₀),用Sub₁₀和同源对照种群(CP)研究甲维盐对棉铃虫的亚致死效应.亚致死剂量(LC₂₅)处理CP和Sub₁₀ 3龄初幼虫,CP幼虫的生长抑制率为61.24%,显著大于Sub₁₀的36.23%.亚致死剂量处理种群与空白对照相比,以及Sub₁₀与CP相比,前者均表现为生长发育延缓,蛹期延长,但蛹重、产卵量和卵孵化率无显著差异.亚致死剂量处理后,CP的净生殖率(R₀)、内禀增长率(r_m)、周限增长率(λ)分别由385.60、0.21、1.23降低至91.86、0.15、1.16,平均世代时间(T)和种群倍增时间(D_t)分别由28.24天和3.29天延长至29.93天和4.64天;而Sub₁₀仅r_m显著降低、T显著延长.说明甲维盐亚致死剂量对棉铃虫生长、繁殖有不利影响.

Abstract:A population (Sub₁₀) of cotton bollworm (CBW), Helicoverpa armigera (Hübner), which obtained by treating successively the 3rd instar larvae of a CBW colony for 10 generations using sublethal dose (LC₂₅ dose) of emamectin benzoate, and the homologous control population (CP) were used to evaluate sublethal effects of the insecticide on the pest insect. The results indicated that the sublethal dose significantly inhibited growth of third instar larvae of CP with 61.24% of inhibition rate, but only 36.23% of inhibition rate of Sub₁₀. The sublethal dose delayed the CBW growth and development, prolonged the pupa period, but had no effect on pupa weight, fecundity and egg hatching rate in both populations compared with their untreated populations. There were same sublethal effects in Sub₁₀ compared with CP when reared without insecticide treatment. When treated with the sublethal dose in CP, values of net reproductive rate (R₀), intrinsic rate of increase (r_m) and finite rate of increase (λ) significantly decreased from 385.60, 0.21, and 1.21 to 91.86, 0.15, and 1.16, respectively, and mean generation time (T) and population doubling time (D_t) significantly increased from 28.24 days, and 3.29 days to 29.93 days, and 4.64 days, respectively, but in Sub₁₀, only r_m and T showed significant change. The results suggest that sublethal dose of emamectin benzoate brings negative effects on growth and develop- ment of H.armigera.

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