| Summary: | Imunit is a mixture of alpha-cypermethrin + teflubenzuron, and has been launched for controlling caterpillars. In this study, the effects of Imunit at LC<sub>50</sub> and LC<sub>30</sub> were investigated on parental and offspring generation of <i>S. cilium</i>, according to age-stage, two-sex life table. The experiments were conducted by leaf dipping method at 25 °C and 60 ± 5% relative humidity, under a cycle of 16 h fluorescent light and 8 h darkness. LC<sub>30</sub> and LC<sub>50</sub> concentrations of Imunit increased the immature developmental time of <i>S. cilium</i> in the offspring generation, while the LC<sub>50</sub> of Imunit significantly reduced the developmental time of adults. The adult pre-oviposition period and total pre-oviposition period considerably increased when offspring were treated with LC<sub>50</sub> of Imunit. In offspring of <i>S. cilium</i> exposed to LC<sub>50</sub> and LC<sub>30</sub> concentrations of Imunit, the gross reproductive rate (<i>GRR</i>), net reproduction rate (<i>R</i><sub>0</sub>), the intrinsic rate of population increase (<i>r</i>), and the finite rate of population increase (<i>λ</i>) significantly reduced compared to the control. This study showed that the application of Imunit at LC<sub>50</sub> could suppress the <i>S. cilium</i> population and can be used in the integrated management program of this pest.
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