Toxicity risk of insecticides to the insect egg parasitoid Trichogramma evanescens Westwood (Hymenoptera: Trichogrammatidae)

文献类型： 外文期刊

第一作者： Wang, Yanhua

作者： Wang, Yanhua;Wu, Changxing;Cang, Tao;Yang, Lizhi;Yu, Weihua;Zhao, Xueping;Wang, Qiang;Cai, Leiming

作者机构：

关键词： insecticide toxicity;conservation biological control;chemical control;integrated pest management

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：4.845； 五年影响因子：4.674 ）

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收录情况： SCI

摘要： BACKGROUND: Natural populations of Trichogramma evanescens contribute to the control of lepidopterous pests. The toxic effects of insecticides have been extensively reported on trichogrammatids, but are largely unknown on 7". evanescens. In this study, the toxicities of seven classes of chemicals against the parasitoid were investigated. RESULTS: Among these classes, organophosphates and carbamates exhibited the highest levels of intrinsic toxicity, with LC_(50) values ranging from 0.025 (0.023-0.028) to 2.20 (1.71-3.09) and from 0.040 (0.032-0.053) to 1.84 (1.53-2.30) mg Al L~(-1) respectively. Among the phenylpyrazoles, only ethiprole can be considered to be less toxic in the group. Avermectins, pyrethroids and neonicotinoids were less toxic, with LC_(50) values ranging from 1.29 to 2.57, from 2.26 to 14.03 and from 1.12 to 239.1 mg Al L~(-1) respectively. In contrast, insect growth regulators (IGRs) showed the lowest toxicity to the parasitoid, with LC_(50) values ranging from 3383 (2406-5499) to 5650 (4228-8579) mg Al L~(-1). CONCLUSION: The results of risk quotient analysis indicated that neonicotinoids, avermectins, pyrethroids and IGRs were less hazardous, but phenylpyrazoles (except for ethiprole), organophosphates and carbamates were slightly to moderately or dangerously toxic to T. evanescens. The present results provide informative data for implementing biological and chemical control strategies in integrated pest management of lepidopterans.

分类号： S4

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