Insect predators, in general, play an important role in regulating pest populations in agricultural systems, but may be negatively affected by pesticides used in pest management. Convergent lady beetle, Hippodamia convergens Guerin-Meneville (Coleoptera: Coccinellidae) is known as an important biological control agent of soft-bodied insect pests. The development of Integrated Pest Management (IPM) program against insect pests requires an assessment of the side effect of insecticides on biological control agents. In the present work, we assessed the sublethal effects of an insect growth regulator, Pyriproxyfen (juvenile hormone mimic) on a common aphidophagous beetle, H. convergens by computing its demographic parameters through age-stage, two-sex life table theory. Present results showed that sublethal (LC₁₀ and LC₃₀) concentrations of tested insecticide prolonged the pre-adult developmental duration while adult longevity, fecundity and fertility were reduced following treatment compared with control. However, total pre-ovipositional period (TPOP) was declined with the increasing trend of insecticide concentration. In additions, population growth parameters such as intrinsic rate of increase r, finite rate of increase λ and net reproductive rate R₀ were dramatically reduced in H. convergens population when they treated with sublethal concentrations pyriproxyfen. Therefore, the results obtained through this study reflected that pyriproxyfen impairs the population growth parameters and could reduce the biological services provided by H. convergens. Thus, more attention should be paid to the use of this insecticide in IPM program.

通常，昆虫天敌在调节农业系统中的有害生物种群方面起着重要作用，但可能会受到有害生物管理中使用的农药的不利影响。会聚的瓢虫，河马收敛虫Guerin-Meneville（鞘翅目：瓢虫科）被认为是软体害虫的重要生物防治剂。制定针对病虫害的病虫害综合治理（IPM）计划需要评估杀虫剂对生物防治剂的副作用。在当前的工作中，我们评估了昆虫生长调节剂吡y羟芬（幼年激素模拟物）对常见的两栖甲虫H. convergens的亚致死作用。通过年龄阶段的两性生命表理论计算人口统计参数。目前的结果表明，与对照相比，治疗后的亚致死浓度（LC ₁₀和LC ₃₀）延长了成虫的发育持续时间，而成年后的寿命，繁殖力和繁殖力却降低了。然而，随着杀虫剂浓度的增加趋势，整个产卵前期（TPOP）有所下降。此外，H。convergens的种群增长参数，如内在增长率r，有限增长率λ和净生殖率R ₀显着降低。当他们接受亚致死浓度的吡ip昔芬治疗时。因此，通过这项研究获得的结果反映出吡吡洛芬损害了种群的生长参数，并可能减少由H. convergens提供的生物学服务。因此，应更加注意在IPM程序中使用这种杀虫剂。