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Sublethal effects of Bt toxin and chlorpyrifos on various Spodoptera exigua populations

文献类型： 外文期刊

作者： Su, Hong-Hua 1 ; Jiang, Li-Li 1 ; Wang, Hai-Tao 1 ; Yang, Ting-Zhang 2 ; Harvey-Samuel, Tim 3 ; Zhou, Qiu-Xia 1 ; Lu, 1 ;

作者机构： 1.Yangzhou Univ, Sch Hort & Plant Protect, Yangzhou 225009, Jiangsu, Peoples R China

2.Urban Construct Tech Coll, Fundamentals Dept, Dalian 110122, Liaoning, Peoples R China

3.Univ Oxford, Dept Zool, Oxford OX1 3PS, England

4.Zhejiang Acad Agr Sci, Inst Plant Protect & Microbiol, Hangzhou 310021, Zhejiang, Peoples R China

关键词： Bt10 strain;susceptible strain;Lepidoptera;Noctuidae;beet armyworm;Bacillus thuringiensis;Cry1Ac;secondary pest

期刊名称：ENTOMOLOGIA EXPERIMENTALIS ET APPLICATA （ 影响因子：2.25； 五年影响因子：2.184 ）

ISSN：

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收录情况： SCI

摘要： Bt cotton (Cry1Ac) has been commercially grown in China since 1997, saving China's cotton production from attack by Bt-target pests and also tremendously reducing pesticide usage. In recent years, however, Bt cotton, with 4.2 million ha of cultivation, has suffered from a secondary target pest, Spodoptera exigua (Hubner) (Lepidoptera: Noctuidae). In China, growers have even had to re-adopt conventional pesticides to control the pest, and this practice has already caused serious pesticide residue. In order to clarify the sublethal effects of chemical pesticide, the responses of a Bt-susceptible and a Bt-tolerant (Bt10) S. exigua strain to three treatment combinations were examined, including Bt toxin, sublethal chlorpyrifos, and Bt + sublethal chlorpyrifos. The susceptible and the Bt10 strain responded differently to dual pressure. Bt toxin + sublethal chlorpyrifos treatment lowered larval mortality and stimulated population increase of the susceptible S. exigua, whereas it delayed growth and development of the Bt10 strain. Under dual pressure, although larvae of the Bt10 strain developed faster than larvae of the susceptible strain, the Bt10 population experienced higher larval mortality, prolonged pupal duration, decreased pupal weight, decreased emergence rate, and shortened adult longevity. Compared with the susceptible strain, the Bt10 strain was deleteriously affected by sublethal chlorpyrifos. The Bt-tolerant/resistant S. exigua population was more vulnerable to chemical pesticides like chlorpyrifos regardless of whether it was exposed to Bt toxin or not. Our study provides a reference for increasing the efficacy of control of S. exigua in Bt-cotton planting areas.

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