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Sublethal effects of imidacloprid on the fecundity, longevity, and enzyme activity of Sitobion avenae (Fabricius) and Rhopalosiphum padi (Linnaeus)

文献类型: 外文期刊

作者: Lu, Y. -H. 1 ; Zheng, X. -S. 1 ; Gao, X. -W. 2 ;

作者机构: 1.Zhejiang Acad Agr Sci, Inst Plant Protect & Microbiol, Hangzhou 310021, Zhejiang, Peoples R China

2.China Agr Univ, Dept Entomol, Beijing 100193, Peoples R China

关键词: imidacloprid;aphid;survival;fecundity;sublethal effects;enzyme activity

期刊名称:BULLETIN OF ENTOMOLOGICAL RESEARCH ( 影响因子:1.75; 五年影响因子:2.007 )

ISSN:

年卷期:

页码:

收录情况: SCI

摘要: The aphid species Sitobion avenae and Rhopalosiphum padi are the most important pests in wheat growing regions of many countries. In this study, we investigated the sublethal effects of imidacloprid on fecundity, longevity, and enzyme activity in both aphid species by comparing 3-h exposure for one or three generations. Our results indicated that 3-h exposure to sublethal doses of imidacloprid for one generation had no discernible effect on the survival, fecundity, longevity, or enzyme activity levels of aphids. However, when pulse exposures to imidacloprid were sustained over three generations, both fecundity and longevity were significantly decreased in both S. avenae and R. padi. Interestingly, the fecundity of R. padi had almost recovered by the F5 generation, but its longevity was still deleteriously affected. These results indicated that R. padi laid eggs in shorter time lags and has a more fast resilience. The change in reproduction behavior may be a phenomenon of R. padi to compensate its early death. If this is stable for the next generation, it means that the next generation is more competitive than unexposed populations, which could be the reason underlying population outbreaks that occur after longer-term exposure to an insecticide. This laboratory-based study highlights the sublethal effects of imidacloprid on the longevity and fecundity of descendants and provides an empirical basis from which to consider management decisions for chemical control in the field.

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