Abstract
BackgroundSpodoptera frugiperda (JE Smith), or fall armyworm, is one of major migratory agricultural pests with a wide range of hosts. The effect of different hosts (maize and kidney bean) on the growth and reproduction of S. frugiperda were investigated using the age-stage, two-sex life table method.ResultsThe results showed that S. frugiperda could complete its entire life cycle on both hosts, albeit with significantly different development and reproduction. The durations of larval and pupal development were significantly prolonged whereas adult lifespan was shortened on kidney bean compared to maize. The differences of survival rates at each instar, prepupal and pupal stages between the two hosts were not statistically significant. The total pre-oviposition period was longer on kidney bean than that on maize (42.05 vs 39.04 days), but there was no difference in the oviposition rate (64.77 on kidney bean vs 62.48 on maize). The differences of net reproductive rate, intrinsic rate of increase and finite rate of increase were nonsignificant, while the mean generation time on kidney bean (42.05 days) was significantly longer than that on maize (40.92 days).ConclusionsThe results indicate that S. frugiperda can grow and reproduce normally on both hosts, although maize is more suitable. Nonetheless, the data show that this pest is harmful when the population density is high or when the preferred host is scarce.Graphic abstract
Highlights
Spodoptera frugiperda (JE Smith), or fall armyworm, is one of major migratory agricultural pests with a wide range of hosts
This study aims to explore the suitability of S. frugiperda on kidney bean compared to maize and determine whether the new C-strain of S. frugiperda has a potential damage risk on kidney bean
The 1st, 2nd, 5th, and 6th instar larval and pupal stages were significantly longer on kidney bean compared to maize (t = − 7.782; p < 0.01; t = − 8.803; p < 0.01; t = − 11.824; p < 0.01; t = − 10.242; p < 0.01; respectively), and the total duration of the egg and larval stage was 22.56 days on kidney bean, which was significantly longer than 19.04 days on maize (t = − 13.397; P < 0.01)
Summary
Spodoptera frugiperda (JE Smith), or fall armyworm, is one of major migratory agricultural pests with a wide range of hosts. The fall armyworm Spodoptera frugiperda (JE Smith) (Lepidoptera: Noctuidae) is one of the important worldwide pests that is native to the tropical and subtropical Americas [1]. It was rated as one of the top 10 out of 1187 arthropod pests by the Centre for Agriculture and Biosciences International in the 2017 “State of the World’s. Spodoptera frugiperda was first monitored in Jiangcheng County, Yunnan Province, in January 2019 and was reported as invasive species [7].
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