Lethal and sublethal effects of thiamethoxam on the whitefly predator <em>Serangium japonicum</em> (Coleoptera: Coccinellidae) through different exposure routes
2015
Yao, Feng-Luan | Zheng, Yu | Zhao, Jian-Wei | Desneux, Nicolas | He, Yu-Xian | Weng, Qi-Yong | Institute of Plant Protection ; Chinese Academy of Plant Protection | Institut Sophia Agrobiotech (ISA) ; Institut National de la Recherche Agronomique (INRA)-Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Centre National de la Recherche Scientifique (CNRS) | Fujian Science and Technology Agency of China [2013S0028, 2014R1024-8] ; Young Scientists Fund of Fujian Academy of Agricultural Sciences [2012DBS-3, YC2015-2]
International audience
Afficher plus [+] Moins [-]anglais. Given expectations for a booming usage of thiamethoxam and increasing availability of the promising biological agent Serangium japonicum for the control of Bemisia tabaci in China, an evaluation of their compatibility is crucial for integrated pest management (IPM). This study examined the lethal and sublethal effects of thiamethoxam on S. japonicum through three exposure routes. An acute toxicity bioassay showed that LC50 values of thiamethoxam for S. japonicum through residue contact, egg-dip, and systemic treatment were 6.65, 4.37, and 2.43 mg Al L-1, respectively. The prey consumption of S. japonicum given different densities of B. tabaci eggs under control, discontinuous, egg-dip and systemic exposure scenarios showed a good fit to a Type II functional response. Predation of S. japonicum was most affected under systemic exposure, followed by egg-dip, and discontinuous, which was only slightly affected. In all cases tested, however, predators recovered their predation capacity rapidly, either after 24 h of exposure or 24 h after the end of exposure. Thiamethoxam was highly toxic to S. japonicum regardless of exposure routes. Sublethal effects of thiamethoxam applied systemically or foliar both impaired the biological control of S. japonicum on B. tabaci. Therefore, thiamethoxam should be used with caution in IPM of B. tabaci.
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