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arXiv · 2403.05479

The temperature affects the impact levels of synthetic insecticides on a parasitoid wasp used in the biological control of pentatomid pests in soybean crops

Matheus Rakes·Maíra Chagas Morais·Leandro do Prado Ribeiro·Gabriel Rodrigues Palma·Rafael de Andrade Moral·Daniel Bernardi·Anderson Dionei Grützmacher
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Abstract

The impact of climate change has led to growing global concern about the interaction of temperature and xenobiotics in agricultural toxicological studies. Thus, for the first time, we evaluated the lethal, sublethal and transgerational effects of six insecticides used in the management of stink bug complex in soybean crops on the different life stages of the parasitoid Telenomus podisi (Hymenoptera: Scelionidae) in three temperature levels (15, 25 and 30 {\deg}C). Telenomus podisi adults (F0 generation), when exposed to insecticides based on acephate, spinosad and thiamethoxam + lambda-cyhalothrin, showed accumulated mortality of 100% at all temperature levels tested. On the other hand, methoxyfenozide + spinetoram caused average mortalities of 88.75% at 15 {\deg}C and 38.75% at 25 and 30 {\deg}C. In contrast, the mortality rates caused by chlorfenapyr at 15, 25 and 30 {\deg}C were 1.25, 71.25 and 71.25%. On the other hand, surviving adults in lethal toxicity bioassay did not show differences in egg parasitism (F0 generation) and emergence of F1 generation in all temperature levels studied; however, the insecticide methoxyfenozide + spinetoram showed the lowest level of parasitism and emergence of T. podisi. In addition, our results demonstrated significant changes in the proportion of emerged males and females as the temperature increased; however, we did not find any differences when comparing the insecticides studied. Furthermore, we detected a significant interaction between insecticides and temperatures by contaminating the host's parasitized eggs (parasitoid pupal stage). Generally, the highest emergence reduction values were found at the highest temperature studied (30 {\deg}C). Our results highlighted the temperature-dependent impact of synthetic insecticides on parasitoids, which should be considered in toxicological risk assessments and under predicted climate change scenarios.

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Matheus Rakes, Maíra Chagas Morais, Leandro do Prado Ribeiro, Gabriel Rodrigues Palma, Rafael de Andrade Moral, Daniel Bernardi, Anderson Dionei Grützmacher. 2024-03-08. The temperature affects the impact levels of synthetic insecticides on a parasitoid wasp used in the biological control of pentatomid pests in soybean crops. https://arxiv.org/abs/2403.05479

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