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• W4385789791 abstract "Abstract Background The fall armyworm (FAW), Spodoptera frugiperda , is a devastating invasive pest and a threat to food security in Africa, with yield losses of 20–50%. Recent studies highlighted the importance of cereal crops such as maize and sorghum as the most preferred host plants for FAW oviposition. In the current work, we investigated the olfactory responses of FAW and its key larval endoparasitoid Cotesia icipe to odours from the preferred host (maize) in the presence of six potential companion crops including beans, groundnut, sweet potato, greenleaf- and silverleaf desmodium, and cassava. We hypothesized that odours released by companion crops in maize-based intercropping systems would alter host preferences of FAW for oviposition and its parasitoid responses. Results In dual choice oviposition bioassays, FAW laid significantly more eggs on maize than on the other plants. However, in the multiple-choice bioassays, significantly fewer eggs were laid on maize when companion plants were present except cassava. While wind tunnel bioassays confirmed the differential behavioural responses of FAW, we found that its larval endoparasitoid C. icipe was attracted to volatiles from the companion plants tested individually and/or when they were combined with maize. Coupled gas chromatography–mass spectrometry (GC–MS) analysis detected several potential behaviour-modifying compounds including ( Z )-3-hexenyl acetate, ( E )-β-ocimene, ( E )-4,8-dimethyl-1,3,7-nonatriene, ( E )-β-caryophyllene, camphor, methyl salicylate and ( E, E )-4,8,12-trimethyl-1,3,7,11-tridecatetraene. Conclusions Our findings provide evidence supporting diversified maize cropping system could reduce FAW damage by repelling the pest while simultaneously recruiting its natural enemies. Hence, diversifying cereal cropping system with companion crops could serve as an ecologically sustainable FAW management strategy. Graphical Abstract" @default.
• W4385789791 created "2023-08-13" @default.
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• W4385789791 date "2023-07-18" @default.
• W4385789791 modified "2023-09-23" @default.
• W4385789791 title "Companion crops alter olfactory responses of the fall armyworm (Spodoptera frugiperda) and its larval endoparasitoid (Cotesia icipe)" @default.
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• W4385789791 doi "https://doi.org/10.1186/s40538-023-00415-6" @default.
• W4385789791 hasPublicationYear "2023" @default.
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