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Effects of a Bt-based insecticide on the functional response of Ceraeochrysa cincta preying on Plutella xylostella

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Abstract

Plutella xylostella, is the main pest infesting Brassica crops, and products based on Bacillus thuringiensis (Bt) are frequently used in strategies for its biocontrol. The present study aimed to evaluate whether a Bt-based bioinsecticide affects the predation behavior of Ceraeochrysa cincta when preying on P. xylostella. Three larval instars of the predator and the eggs and second-instar larvae of the moth were used, with the prey either untreated or treated with a Bt-based product (Xentari®). Results showed that, the first larval instar of C. cincta presented a type II functional response when preying upon untreated eggs, and a type III response when preying upon Bt-treated eggs, while the second and third instars presented type II and III responses, respectively, in both situations. The predator’s first and third larval instars presented a type II functional response when preying upon untreated larvae and a type III response when preying upon Bt-treated larvae. However, the predator’s second-instar larvae showed a type II response in both treatments. The results obtained allowed us to conclude that the Bt-based insecticide tested affects the predation behavior of the first-instar larvae of C. cincta on eggs and of both the first- and third-instar larvae of this predator on P. xylostella larvae.

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Acknowledgements

The authors thank Coordination for the Improvement of Higher Education Personnel—Brazil (CAPES—Finance Code 001), National Council for Scientific and Technological Development (CNPq), and the São Paulo Research Foundation (FAPESP—process 2018/10246-0) for the financial support.

Funding

This study was funded by Coordination for the Improvement of Higher Education Personnel—Brazil (CAPES—Finance Code 001), National Council for Scientific and Technological Development (CNPq), and the São Paulo Research Foundation (FAPESP—process 2018/10246-0).

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  1. São Luís Faculty of Education, Jaboticabal, SP, Brazil

    Isabela Cristina de Oliveira Pimenta

  2. Faculty of Agricultural and Veterinary Sciences, São Paulo State University, Jaboticabal, SP, Brazil

    Gilmar da Silva Nunes, Gustavo Oliveira de Magalhães, Matheus Moreira Dantas Pinto & Sergio Antonio De Bortoli

  3. Faculty of Philosophy, Sciences and Letters at Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil

    Nathália Alves dos Santos

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  1. Isabela Cristina de Oliveira Pimenta
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  2. Gilmar da Silva Nunes
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  3. Gustavo Oliveira de Magalhães
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  4. Nathália Alves dos Santos
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Correspondence to Isabela Cristina de Oliveira Pimenta.

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de Oliveira Pimenta, I.C., da Silva Nunes, G., de Magalhães, G.O. et al. Effects of a Bt-based insecticide on the functional response of Ceraeochrysa cincta preying on Plutella xylostella. Ecotoxicology 29, 856–865 (2020). https://doi.org/10.1007/s10646-020-02244-x

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