Abstract
To control crop pests, parasitoid wasps of the genus Trichogramma are one alternative to the use of insecticides. Since a wide variety of agrochemicals may be applied to the same crops, it is essential to assess the selectivity of insecticides used for pest control on Trichogramma pretiosum. Information on which insecticides are less harmful to T. pretiosum can improve biological control using this insect, an important tactic in IPM programs for field crops. This study aimed to determine the effects of insecticides on the pupal stage and on the parasitism capacity of T. pretiosum. Lambda-cyhalothrin + thiamethoxam were slightly harmful and chlorpyriphos was moderately harmful to the pupal stage, while acephate, chlorfenapyr and flubendiamide, although considered innocuous, affected the succeeding generations of wasps, with low emergence of F1. Chlorfenapyr, chlorpyriphos and lambda-cyhalothrin + thiamethoxam reduced the parasitism, and acephate had a deleterious effect on the generation that contacted the insecticide residue. For an effective IPM program, it is important to apply selective insecticides. Further studies are needed to determine the selectivity of these insecticides under field conditions.
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Acknowledgements
The authors thank the CAPES Foundation (Brazilian Ministry of Education), the São Paulo State Foundation for Research Aid (FAPESP) and the National Council for Scientific and Technological Development (CNPq grant 305828/2014-2) for the financial support and scholarships granted. The authors also thank Janet W. Reid for revising the English text.
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de Paiva, A.C.R., Beloti, V.H. & Yamamoto, P.T. Sublethal effects of insecticides used in soybean on the parasitoid Trichogramma pretiosum. Ecotoxicology 27, 448–456 (2018). https://doi.org/10.1007/s10646-018-1909-5
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DOI: https://doi.org/10.1007/s10646-018-1909-5