Although the use of chemical insecticides to control Frankliniella occidentalis is widespread, it may also affect its dominant predators such as Orius similis. To understand the consequences of imidacloprid on the growth, development, and reproduction of O. similis, we investigated its toxicity and selected the concentrations of LC₁₀ and LC₂₀ for both contact and stomach toxicity tests. Using the age-stage two-sex life table theory, we evaluated the impact of imidacloprid on the life table of the O. similis population. The results showed that the LC₁₀ and LC₂₀ values for each developmental stage of O. similis were lower under contact treatment than those under stomach toxicity treatment. After treatment with imidacloprid, the average oviposition by O. similis decreased compared to the control, and the net reproductive rate, gross reproduction rate, intrinsic rate of increase, and finite rate of increase were also lower than the control. The results also indicated that the peak value of age-stage-specific fecundity of O. similis was delayed by 1–2 days after imidacloprid treatment. Predictions for population growth of O. similis under unrestricted conditions showed that at 60 days, the population size of the control treatment was 2.06 times and 3.20 times that of LC₁₀ contact and stomach toxicity treatment, respectively. For LC₂₀ concentration, the control treatment's population size was 2.75 times and 3.87 times, respectively. Exposure to imidacloprid at different concentrations and treatment with contact and stomach toxicity had adverse effects on the growth and population growth of O. similis. Under imidacloprid stomach toxicity treatment, O. similis showed longer growth time and a slower population growth rate, indicating strong adaptability to the contact environment.

尽管使用化学杀虫剂来控制西花蝽的情况很普遍，但它也可能影响其主要捕食者，例如花蝽。为了了解吡虫啉对O. similis生长、发育和繁殖的影响，我们研究了其毒性并选择了LC ₁₀和LC ₂₀的浓度进行接触和胃毒性试验。利用年龄阶段两性生命表理论，我们评估了吡虫啉对O. similis种群生命表的影响。结果表明，接触处理下的青花螟各发育阶段的LC ₁₀和LC ₂₀值均低于胃毒处理下的LC 10 和LC 20 值。吡虫啉处理后，小圆线虫平均产卵量较对照下降，净繁殖率、毛繁殖率、内在增长率和有限增长率也低于对照。结果还表明，吡虫啉处理后，小圆线虫的年龄阶段特定繁殖力峰值延迟了1~2天。对无限制条件下的小圆线虫种群增长的预测表明，60天时，对照处理的种群规模分别是LC ₁₀接触和胃毒处理的2.06倍和3.20倍。对于LC ₂₀浓度，对照处理的群体大小分别是2.75倍和3.87倍。不同浓度吡虫啉的暴露以及触杀和胃毒处理对小圆线虫的生长和种群增长产生不利影响。在吡虫啉胃毒处理下，小圆线虫的生长时间较长，种群增长速度较慢，表明其对接触环境的适应性较强。