关键词:  白背飞虱, 阿维菌素, 亚致死效应, 年龄阶段两性生命表, 繁殖力, 生长发育

Abstract: 【Aim】 To investigate the sublethal effects of abamectin on Sogatella furcifera. 【Methods】The 3rd instar nymphs of S. furcifera were treated with abamectin at LC₁0 (0.016 mg/L) and LC₂₅ (0.031 mg/L) concentrations using rice seedling dipping method. The longevity of female and male adults and the number of eggs laid per female of F₀ generation were recorded, and the developmental duration, fecundity, survival rate, female and male adult longevity, intrinsic rate of increase (r), finite rate of increase (λ), net reproductive rate (R₀), and mean generation time (T) of F₁ generation were recorded, and the age-stage, two-sex life table was established. 【Results】 After the 3rd instar nymphs of S. furcifera were exposed to LC₁₀ and LC₂₅ concentrations of abamectin, the number of eggs laid per female of the F₀ generation was significantly reduced, but the hatching rate was not affected as compared to the control (distilled water). Abamectin at the LC₂₅ concentration significantly prolonged the male adult longevity, whereas the female adult longevity was significantly shortened by the LC₁₀ of abamectin compared with the control. In addition, LC₁₀ and LC₂₅ concentrations of abamectin significantly reduced the number of eggs laid per female of the F₁ generation (LC₁₀: 170.64 grains; LC₂₅: 155.79 grains)  compared with the control (193.38 grains). In the LC₁₀ and LC₂₅ concentration treatment groups, the intrinsic rate of increase (r), finite rate of increase (λ) and mean generation time (T) of the F₁ generation were slightly lower than those in the control group, while the reproductive rate (R₀) showed a decreasing trend but not significantly different from that in the control. 【Conclusion】 Abamectin stress at the sublethal concentrations could somewhat inhibit the offspring population growth of S. furcifera.

Key words:  Sogatella furcifera, abamectin, sublethal effect, age-stage, two-sex life table, fecundity, growth and development