Laboratory and field evaluation of some synthetic and bio-insecticides against the fall armyworm, Spodoptera frugiperda (J. E. Smith) on maize

Résumé

Fall armyworm (FAW), Spodoptera frugiperda (Lepidoptera: Noctuidae), a maize pest from around the world, entered Africa in 2016 and caused harm. Maize is a vital crop for the global population. Insecticides are the most essential short-term strategy for managing FAW because of their high efficiency and cost-effectiveness. The goal of this study was to examine the efficiency of certain synthetic and bio-insecticides against three different FAW strains from Menufia, Sharkia, and Kalubia Governorates, which were collected from maize fields. A bioassay technique was used against 2nd instar larvae. Additionally, a field trial in Menufia Governorate was conducted. The laboratory results showed that chlorfenapyr (Challenger® 24% SC) was the most effective against the three field strains, followed by indoxacarb (Kangluda® 15% SC) and methomyl (Lannate® 90% SP). Emmamectin benzoate (EMB) (Aquaquim® 5.7% WG) was the most effective bio-insecticide against the Menufia strain, followed by spinetoram (Radiant®, 12% SC) against the Sharkia strain and Bacillus thuringiensis (Bt) (Dipel®, 6.4% DF) against Kalubia strain. The efficacy of Challenger®, Kangluda®, Lannate®, Dipel®, Aquaquim®, and Radiant® was evaluated in a field study, with mean values of 62.24, 59.13, 53.43, 46.33, 37.49, and 35.82%, respectively. Such insights could aid management decision-making in developing an effective control approach.

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