Abstract:A leaf disc bioassay was employed to investigate the demographic responses of hawthorn spider mite, Tetranychus viennensis Zacher, to the selected insecticides, clofentezine, abamectin, fenpropathrin, and azocyclotin, at three levels of sublethal concentrations. Life tables were constructed in each trial. The parameters, including the intrinsic rate of increase (rm), finite rate of increase (λ), the net reproduction rate (R0), mean generation time (T), doubling time (Dt), and age distribution were calculated. Exposures of adults to abamectin, fenpropathrin, and azocyclotin exhibited shortened longevity and reduced fecundity in a concentration-dependent manner. Consequently, the values of rm in offspring of treated females deceased significantly from 0.173 in control to 0.133-0.167 in exposures of abamectin and azocyclotin, however, the value of rm in offspring of fenpropathrin-treated females at LC10 was equal to that of the control. Exposures of protonymphs to abamectin at the dose of LC10 and LC25 produced significantly deceased rm, which dropped from 0.237 in control to 0.197-0.199, whereas the exposure of protonymphs to fenpropathrin at the dose of LC10 yielded a significantly increased rm as compared to the control, but no significant difference was detected between LC25 exposure and the control. Exposures of eggs to clofentezine resulted in significantly deceased rm at doses of LC25 and LC50 as compared to the control but no significant difference was found between LC10 exposure and the control.