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A predatory social wasp does not avoid nestmates contaminated with a fungal biopesticide

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Abstract

Fungus-based biopesticides have been used worldwide for crop pest control as a safer alternative to chemical pesticides such as neonicotinoids. Both agrochemicals can be lethal and may also trigger side effects on the behavioral traits of non-target social insects, which play a crucial role in providing essential biological pest control services in agroecosystems. Here, we evaluated whether a commercial formulation of the entomopathogenic fungus Beauveria bassiana or the neonicotinoid imidacloprid causes mortality in foragers of Mischocyttarus metathoracicus. These social wasps are natural enemies of caterpillars and other herbivorous insects and inhabit both urban and agricultural environments in Brazil. We also tested whether wasps discriminate between biopesticide-exposed and unexposed conspecifics. Through a combination of laboratory (survival assay) and field experiments (lure presentation), along with chemical analyses (cuticular hydrocarbon profiles), we showed that topic exposure to the label rate of each pesticide causes a lethal effect, with the biopesticide exhibiting a slower effect. Moreover, wasps do not discriminate biopesticide-exposed from unexposed conspecifics, likely because of the similarity of their cuticular chemical profiles 24 h after exposure. Overall, the delayed lethal time at the individual level, combined with the indistinctive chemical cues of exposure and the lack of discrimination by conspecifics suggests that the fungal biopesticide may ultimately pose a threat to the colony survival of this predatory wasp.

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Funding

This study was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) (grants 2020/14464–2 to A.R.S., 2022/07997–0 to A.P., 2019/08029–4 to W.F., 2021/00984–7 to L.D.L., 2020/06632–2 to E.F.S., and 2018/10996–0 to F.S.N.), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior — Brasil (CAPES) — Finance Code 001 (to S.S.), CAPES Print program (grant 88887.571161/2020–00 to M.A.P.L.), and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (grants 142285/2018–8 to A.P., and 164743/2020–0 to D.A.A.).

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Conceptualization: André Rodrigues de Souza; writing the original draft: all authors; data curation: André Rodrigues de Souza; Amanda Prato; funding acquisition: André Rodrigues de Souza; investigation: Amanda Prato, Wilson Franca, Sircio Santos, Luan Dias Lima; statistical analyses: Rodrigo Cupertino Bernardes and Eduardo Fernando Santos.

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Correspondence to André Rodrigues de Souza.

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de Souza, A.R., Prato, A., Franca, W. et al. A predatory social wasp does not avoid nestmates contaminated with a fungal biopesticide. Environ Sci Pollut Res 30, 103851–103861 (2023). https://doi.org/10.1007/s11356-023-29770-5

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  • DOI: https://doi.org/10.1007/s11356-023-29770-5

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