Sublethal Effects of Three Insecticides on Development and Reproduction of Spodoptera frugiperda (Lepidoptera: Noctuidae)

Spodoptera frugiperda is a serious invasive pest, which has attracted attention globally in recent years. Research on the sublethal effects of common insecticides on S. frugiperda is important for its comprehensive management in the field. In this paper, the sublethal effects have been studied for S. frugiperda exposed to the LC30 concentration of three insecticides, chlorantraniliprole, dinotefuran, and beta-cypermethrin. The results showed that the pupation rates of the treatment groups were significantly lower than that of control group, but there were no significant differences in the eclosion rate. Chlorantraniliprole and beta-cypermethrin significantly inhibited fecundity of the F-0 and F-1 generations, and the number of eggs laid per female decreased by 67.4% and 43.1%, respectively, and that of the F-1 generation decreased by 28.0% and 21.7%, respectively. The intrinsic growth rate (r(m)), net growth rate (R-0), and weekly growth rate (lambda) of the F-0 generation in the chlorantraniliprole and beta-cypermethrin treatment groups were significantly lower than those in the control group. Additionally, dinotefuran had a certain role in promoting oviposition in the F-0 and F-1 generations, which may stimulate the growth of offspring population and cause the resurgence of pests. The results provide a reference for the effective implementation of the IPM plan in the field to control S. frugiperda.

Automated summary

The sublethal effects of common insecticides on Spodoptera frugiperda were studied. The results showed that the insecticides led to decreased pupation rates, inhibited fecundity, and restricted the growth of offspring population. However, one insecticide had a promoting effect on oviposition, which may cause the resurgence of pests.