Sublethal effects of imidacloprid on Bemisia tabaci (Hemiptera: Aleyrodidae) under laboratory conditions

文献类型： 外文期刊

第一作者： He, Yuxian

作者： He, Yuxian;Wu, Kongming;He, Yuxian;Zhao, Jianwei;Wu, Dongdong;Wyckhuys, Kris A. G.

作者机构：

关键词： Bemisia tabaci;imidacloprid;sublethal effect;toxicity

期刊名称：JOURNAL OF ECONOMIC ENTOMOLOGY （ 影响因子：2.381； 五年影响因子：2.568 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： The sweetpotato whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), is one of the most important pests in tropical and subtropical agriculture and is a key pest in greenhouse production worldwide. Current management of B. tabaci relies upon frequent applications of insecticides. Insecticide use not only directly affects pest populations through acute toxicity but also has indirect (sublethal) effects on pest physiology or behavior. In this study, we described sublethal effects of imidacloprid on adult feeding, immature development, adult fecundity, and F_1 development of B. tabaci. Honeydew excretion of adults feeding on leaves treated with LC_(20) and LC_(40) concentration was significantly lower than that on untreated leaf discs. Egg production of B. tabaci adults subject to LC_(20) and LC_(40) concentrations also was less than untreated individuals. Upon transfer to untreated leaves, honeydew excretion and egg production recovered well within 24 and 48 h, respectively. Exposure to LC 20 and LC_(40) concentrations significantly affected developmental time of B. tabaci eggs and nymphs, whereas it did not affect adult molting rate. We did not find sublethal effects on longevity and fecundity of B. tabaci adults when exposed to LC_(20) and LC_(40) concentrations for 24 h, and on egg hatching rate, nymphal mortality, and molting rate of the subsequent F_1 generation. Exposure to imidacloprid at LC_(40) concentration significantly decreased the number of females in the F_1 generation. Imidacloprid negatively affects development and reproduction of exposed individuals, and sex ratio of subsequent (F_1) generation of B. tabaci, which probably disrupts B. tabaci population dynamics, slows population increase, and reduces infestation levels. Therefore, it is necessary to consider potential impact from imidacloprid for integrated management of the pest.

分类号： Q969.9

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