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17 May 2017 Sublethal Effects of Thiamethoxam on the Demographic Parameters of Myzus persicae (Hemiptera: Aphididae)
Pan Wang, Li-Lin Zhou, Fan Yang, Mang Li, Xiao-Ming Liu, Yong Wang, Chao-Liang Lei, Sheng-Yun Si
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Abstract

The green peach aphid, Myzus persicae Sulzer (Hemiptera: Aphididae), is an important sap-sucking pest of many crops, including Chinese cabbage, Brassinca oleracea L. The neonicotinoid insecticide thiamethoxam has been used as an effective insecticide to control M. persicae in cabbage fields. In this study, we assessed the effects of sublethal concentrations of thiamethoxam on demographic parameters of M. persicae. In leaf-dip bio-assays, thiamethoxam showed a relatively high toxicity against M. persicae with an LC50 of 6.80 mg liter–1. The duration of the preadult stage was not significantly affected in the sublethal bioassay. Additionally, the longevity and adult preoviposition period were not significantly affected by sublethal thiamethoxam. However, sublethal thiamethoxam significantly increased fecundity (LC10) and prolonged the total preoviposition period (LC40). Consequently, the finite rate of increase (λ) and the intrinsic rate of increase (rm) of aphids exposed to the LC40 were significantly lower than those of control aphids, whereas the net reproductive rate (R0) was higher, and the generation time (T) and the population doubling time (DT) were longer in the treated group. Based on these results, hormesis was induced by sublethal thiamethoxam in M. persicae, with the population growth of M. persicae negatively affected at higher sublethal concentrations of thiamethoxam. Therefore, our study indicated that the possible effects of thiamethoxam on aphids require further study to develop optimized integrated pest management strategies.

© The Authors 2017. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For Permissions, please email: journals.permissions@oup.com
Pan Wang, Li-Lin Zhou, Fan Yang, Mang Li, Xiao-Ming Liu, Yong Wang, Chao-Liang Lei, and Sheng-Yun Si "Sublethal Effects of Thiamethoxam on the Demographic Parameters of Myzus persicae (Hemiptera: Aphididae)," Journal of Economic Entomology 110(4), 1750-1754, (17 May 2017). https://doi.org/10.1093/jee/tox112
Received: 5 December 2016; Accepted: 22 March 2017; Published: 17 May 2017
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