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Susceptibility of Chrysoperla externa (Hagen, 1861) (Neuroptera: Crysopidae) to insecticides used in coffee crops

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Abstract

The coffee crop hosts pests such as mites, mealybugs, and aphids which serve as food for the predator Chrysoperla externa (Hagen) (Neuroptera: Chrysopidae). The preservation of this chrysopid in coffee agroecosystem is very important to achieve sustainability of this agricultural sector, and can be obtained by applying low toxicity insecticides. The present study aimed to evaluate the susceptibility of C. externa to azadiracthin, chlorpyrifos, ethiprole and teflubenzuron. Predator eggs, third instar larvae, pupae and adults were exposed to insecticides by Potter tower spraying. When evaluating exposure of C. externa eggs we observed that chlorpyrifos, ethiprole and teflubenzuron reduced larvae hatching, while azadiracthin prolonged first instar duration. Meanwhile, the exposure of third instar larvae to chlorpyrifos and ethiprole caused mortality of all insects after 72 h, while azadiracthin prolonged the larval development time; we also observed that no compound allowed the formation of adults. After pupae were exposed to chlorpyrifos and teflubenzuron, it was observed a reduction on the emergence of adults, while the longevity of adults from these pupae and the evaluated reproductive parameters were reduced by all insecticides. For the bioassay with adults, chlorpyrifos, ethiprole and teflubenzuron reduced the longevity of insects, while the reproductive parameters evaluated were negatively affected after exposure to azadiracthin and teflubenzuron. It was concluded that all insecticides negatively affected at least one biological characteristic of the predator in at least one of the insect’s developmental stages, requiring further research in semi-field and field conditions to prove its toxicity.

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Acknowledgements

This research was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) – Financial code 306892/2017-0, and Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) – Financial code CAG APQ – 02118-16.

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JRS and GAC conceived research. LBM, LLRL, TGS and PPMB assistance in the creation and maintenance of insects, the assembly and conduct of experiments, as well as the collection and tabulation of data. GAC, JRS, LBM and TGS formal analysis, data analysis and writing of the manuscript.

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Correspondence to Geraldo Andrade Carvalho.

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Souza, J.R., Moreira, L.B., Lima, L.L.R. et al. Susceptibility of Chrysoperla externa (Hagen, 1861) (Neuroptera: Crysopidae) to insecticides used in coffee crops. Ecotoxicology 29, 1306–1314 (2020). https://doi.org/10.1007/s10646-020-02261-w

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  • DOI: https://doi.org/10.1007/s10646-020-02261-w

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