Abstract
This study assessed the transgenerational effects of insecticides in developing Trichogramma galloi (Hymenoptera: Trichogrammatidae). Laboratory bioassays were performed in which five insecticides were sprayed on egg-larval, pre-pupal and pupal stages of the parasitoid. The interaction between insecticides and development stages of the parasitoid was not significant for the rate of F0 emergence. All insecticides significantly reduced the emergence of wasps, with the lowest emergence observed when they were applied to the pupal stage. For the sex ratio, only spinosad applied to the pre-pupal stage and triflumuron applied on the egg-larval and pre-pupal stages did not differ from the controls. Triflumuron applied to pre-pupae did not lead to any difference in the parasitism rate of the treated generation (F0) when compared to the control. There were no significant differences among survival curves for females of F0 when all insecticides were sprayed on the egg-larval stage. Both concentrations of lambda-cyhalothrin + thiamethoxam reduced female pre-pupal survival, and all treatments reduced female pupal survival. In addition, we observed a transgenerational effect of the insecticides on emergence and sex ratio of next generation (F1). Lambda-cyhalothrin + thiamethoxam (Min) applied to the pre-pupae and pupae, the maximum rate of the same insecticides applied to the egg-larvae and pre-pupae, and spinosad applied to pre-pupae all significantly reduced the adults emergence of T. galloi F1 generation. Only triflumuron did not alter the F1 sex ratio. These bioassays provide a basis for better understanding the effects of insecticide use on beneficial parasitoids.
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Acknowledgments
We would like to thank the National Council of Scientific and Technological Development (CNPq), the CAPES Foundation (Brazilian Ministry of Education), and the Minas Gerais State Foundation for Research Aid (FAPEMIG) for the financial support provided. We would also like to thank Dr. J. P. Michaud, Kansas State University, for his comments and corrections.
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The authors declare that they have no conflict of interest.
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All study participants provided informed consent, and the study design was approved by the appropriate ethics review boards.
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Costa, M.A., Moscardini, V.F., da Costa Gontijo, P. et al. Sublethal and transgenerational effects of insecticides in developing Trichogramma galloi (Hymenoptera: Trichogrammatidae). Ecotoxicology 23, 1399–1408 (2014). https://doi.org/10.1007/s10646-014-1282-y
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DOI: https://doi.org/10.1007/s10646-014-1282-y