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Bacillus thuringiensis-based bioinsecticides affect predation of Euborellia annulipes on diamondback moth larvae

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Abstract

Interactions between earwigs and entomopathogens, such as Bacillus thuringiensis (Bt), are still poorly understood. This study tested whether Bt-based bioinsecticides have any effect on the predation of Euborellia annulipes (Lucas) (Dermaptera: Anisolabididae) on Plutella xylostella (L.) (Lepidoptera: Plutellidae), one of the pests with the largest number of cases of use and resistance to Bt. Fourth instar larvae were Bt infected by feeding on collard green leaves treated with Dipel®WG and XenTari®WG at the manufacturer-recommended doses. We used one no-choice condition, in which the predator had access to uninfected or Bt-infected larvae separately, and four free-choice conditions: uninfected vs Dipel®-infected larvae, uninfected vs XenTari®-infected larvae, Dipel®-infected vs XenTari®-infected larvae, and uninfected vs Bt-infected larvae with both bioinsecticides. Uninfected larvae were less consumed than those infected by both Bt-bioinsecticides in the no-choice condition. There was a higher consumption of uninfected over Dipel®-infected larvae in the free-choice condition. Overall, uninfected larvae were preferred over both Bt-based bioinsecticides infected larvae. We also used six different prey densities. The ringlegged earwig’s predation rate enhanced as the prey population density increased, but the functional response was not affected by Bt-infection, being type II. The predator invested a low amount of handling time on Bt-fed prey and increased the maximum predation rate. Bt-based bioinsecticides cause effects on E. annulipes predation by altering their feeding preference and some aspects of its predatory behavior. The results of our study provide an important background for understanding interactions between earwigs and Bt. In addition, they can be used for decision making during approaches to integrated P. xylostella management.

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Acknowledgements

We would like to thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for supporting this research through the research scholarships.

Funding

This work was supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) through the research scholarships (financial code 001).

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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by GSN and JMS. The first draft of the manuscript was written by GSN and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Gilmar da Silva Nunes.

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da Silva Nunes, ., de Souza, J.M., Ramalho, D.G. et al. Bacillus thuringiensis-based bioinsecticides affect predation of Euborellia annulipes on diamondback moth larvae. Environ Sci Pollut Res 30, 90730–90740 (2023). https://doi.org/10.1007/s11356-023-28814-0

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  • DOI: https://doi.org/10.1007/s11356-023-28814-0

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