Sublethal effects of fenvalerate on biological performance and life table parameters of the grass-lawn armyworm, Spodoptera cilium (Lepidoptera: Noctuidae)

• Published in: International journal of tropical insect science 2022-04, Vol.42 (2), p.1341-1347
• Main Authors: Hatami, Marzieh, Ziaee, Masumeh, Seraj, Ali Asghar, Mehrabi-Koushki, Mehdi
• Format: Article
• Language: English
• Subjects: Biomedical and Life Sciences; Developmental stages; Entomology; Fecundity; Fenvalerate; Grasses; Larvae; Lepidoptera; Life Sciences; Noctuidae; Offspring; Original Research Article; Parameters; Population control; Spodoptera; Spodoptera mauritia; Sublethal effects; Tables (data)
• ISSN: 1742-7592; 1742-7584; 1742-7592
• DOI: 10.1007/s42690-021-00652-y

The grass-lawn armyworm, Spodoptera cilium (Guenee, 1852) (Lepidoptera: Noctuidae), causes considerable losses in graminaceous plants. The effects of fenvalerate at LC 50 (211.4 mg a.i. L −1 ) and LC 30 (151.6 mg a.i. L −1 ) concentrations were investigated on biological parameters of S. cilium in two successive generations . Fenvalerate significantly prolonged the developmental period of larvae and pupae of both generations, as well as reducing the adult longevity and fecundity compared to the control group. Furthermore, the life table parameters, including gross reproduction rate ( GRR ), net reproductive rate ( R 0 ), intrinsic rate of increase ( r ), and finite rate of increase ( λ ) of offspring generation, in the LC 30 and LC 50 -treated groups were significantly lower than the control group. While the mean generation time ( T ) of fenvalerate-treated groups was extended. According to our results, the sublethal concentration of fenvalerate could be effective in controlling the population of later generations and can be used as a tool in the integrated management program of S. cilium .