Effects of Imunit Insecticide on Biological Characteristics and Life Table Parameters of Spodoptera cilium (Lepidoptera: Noctuidae).

Imunit is a mixture of alpha-cypermethrin + teflubenzuron, and has been launched for controlling caterpillars. In this study, the effects of Imunit at LC 50 and LC 30 were investigated on parental and offspring generation of S. cilium , 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 30 and LC 50 concentrations of Imunit increased the immature developmental time of S. cilium in the offspring generation, while the LC 50 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 50 of Imunit. In offspring of S. cilium exposed to LC 50 and LC 30 concentrations of Imunit, the gross reproductive rate ( GRR ), net reproduction rate ( R 0 ), the intrinsic rate of population increase ( r ), and the finite rate of population increase ( λ ) significantly reduced compared to the control. This study showed that the application of Imunit at LC 50 could suppress the S. cilium population and can be used in the integrated management program of this pest.