【目的】 为明确亚致死剂量的吡虫啉对麦二叉蚜 Schizaphis graminum (Rondani) 连续3个世代种群的生存和繁殖的影响。【方法】 采用浸叶法测定吡虫啉对麦二叉蚜的LC₅₀，经吡虫啉亚致死剂量LC₄₀处理麦二叉蚜后，测定并分析其连续3个世代实验种群生存和繁殖的变化。【结果】 同一世代中，吡虫啉LC₄₀剂量处理麦二叉蚜后，可导致F₀世代麦二叉蚜种群的平均寿命、产蚜总数和繁殖期均显著低于对照组种群（P<0.05），但F₁和F₂世代LC₄₀组试虫的存活率和繁殖相关参数与对照组相比无显著差异（P> 0.05）。方差分析结果表明，在不同世代间LC₄₀组试虫的产蚜总数随世代数的增加而显著增多（F=6.38，P=0.002），存活率、平均寿命、繁殖期随世代数的增加而逐渐增加。【结论】 吡虫啉的LC₄₀剂量可显著抑制F₀世代麦二叉蚜个体的存活率和繁殖力，但随着世代数增加，吡虫啉LC₄₀组麦二叉蚜的生存和繁殖力逐渐恢复，F₁和F₂世代与对照组种群的生存和繁殖参数无显著差异。

[Objectives]  The effects of sublethal concentrations of imidacloprid on the survival and reproduction of three successive generations of Schizaphis graminum (Rondani) were determined. [Methods]  The LC₅₀ of imidacloprid to S. graminum was tested using the leaf-dip method. The parental (F₀) generation was exposed to either the LC₄₀ dose of imidacloprid (LC₄₀ group), or distilled water (control group), and the survival and reproduction of this and two successive generations were measured and compared. [Results]  All three LC₄₀ groups had significantly lower longevity, fewer offspring per female, and a shorter reproductive period, than the F₀ control group. The survival and reproductive parameters of the F₁ and F₂ LC₄₀ groups, were, however, no different to those of the control group. In addition, the number of offspring per female, and other reproductive parameters of LC₄₀ groups significantly increased in successive generations. [Conclusion]  Exposure to a sublethal dose of imidacloprid significantly reduces the survival and reproduction of the F₀ generation of S. graminum but the magnitude of these effects decreases in successive generations. The survival and reproductive parameters of the F₁ and F₂ LC₄₀ groups were not significantly different to those of the control group.