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Your Position :Home->Past Journals Catalog->2020年57 No.2

Sublethal effect of insecticides on reproduction of Megalurothrips usitatus (Bagrall) (Thysanoptera: Thripidae)
Author of the article:LUO Ya-Li;SHI Dan;QIAO Xue-Ying;DAN Jian-Guo
Author's Workplace:College of Plant Protection, Hainan University, Key Laboratory of Green Prevention and Control of Tropical Plant Diseases and Pests (Hainan University), Ministry of Education, Haikou 570228, China;College of Plant Protection, Hainan University, Key Laboratory of Green Prevention and Control of Tropical Plant Diseases and Pests (Hainan University), Ministry of Education, Haikou 570228, China;College of Plant Protection, Hainan University, Key Laboratory of Green Prevention and Control of Tropical Plant Diseases and Pests (Hainan University), Ministry of Education, Haikou 570228, China;College of Plant Protection, Hainan University, Key Laboratory of Green Prevention and Control of Tropical Plant Diseases and Pests (Hainan University), Ministry of Education, Haikou 570228, China
Key Words:Megalurothrips usitatus; cyantraniliprole; amitraz; indoxacarb; sex ratio; cowpea
Abstract:
[Objectives]  The aim of this paper is to explore the sublethal effects of three insecticides on reproduction of bean flower thrips [Megalurothrips usitatus (Bagnall)], one of the most economically important insect pests of cowpea [Vigna unguiculata (L.) Walp.] in Hainan Island, China. [Methods]  Under laboratory conditions of (26±1) ℃, 60%±5% R.H. and a photoperiod of 14L∶10D, with young leaves of cowpea (var. Chunfeng-changjiangdou) as food of the bean flower thrips, the lethal and sublethal concentrations of cyantraniliprole, amitraz, and indoxacarb for the 1-d-old mated adult females were determined using a leaf-disc dipping bioassay method. After 48 h exposure to LC20 concentration of each insecticide, the surviving mated or unmated adult females were provided with non-treated leaf discs. The number of eggs and subsequent adult offspring were counted daily until the parental females died. Sex ratios of adult offspring produced by mated females were calculated as proportion of males, and then sex ratios of eggs laid by them were estimated using survival rates of the offspring produced by both mated females and unmated females. [Results]  Exposure to three insecticides at LC20 concentration all significantly decreased the survival duration of either mated or unmated females. The number of adult offspring produced by mated females exposed to cyantraniliprole and amitraz were also significantly reduced. Sex ratios of adult offspring produced by mated females following sublethal exposure to cyantraniliprole, amitraz, and indoxacarb were 0.60, 0.47, and 0.41, respectively, which all were not significantly different from that of control. There was no significant difference in sex ratio of eggs laid by mated females among insecticide treatments and control. [Conclusion]  Sublethal exposure to cyantraniliprole, amitraz, and indoxacarb decreases to some extent the survival duration of the parental females of the bean flower thrips, and the number of adult offspring produced by them, but does not significantly change their sex allocation.
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