Susceptibility of cruciferous vegetable aphids in Guizhou province to insecticides
Author of the article:LI Wen-Hong；LI Tian-Qun；YAND Li-Juan；DENG Li-Rong；WANG Hui-Min；ZHOU Yu-Hang；LI Feng-Liang
Author's Workplace：Guizhou Institute of Plant Protection, Guizhou Academy of Agricultural Sciences; Xiuwen Station of Plant Protection and Quarantine； Yangtze University; Guiyang University
Key Words：Myzus persicae; Brevicoryne brassicae; Lipaphis erysimi; insecticide; susceptibility
Abstract：
[Objectives] To determine the susceptibility to commonly used insecticides in free-living populations of cruciferous vegetables aphids in Guizhou Province, which is important information for controlling, and managing insecticide resistance in, these pests. [Methods] The leaf-dipping method was used to assess susceptibility to more than 10 commonly used insecticides in wild populations of Myzus persicae (Sulzer), Brevicoryne brassicae (Linnaeus) and Lipaphis erysimi (Kaltenbach) in Guiyang, Xifeng, Qianxi and Zunyi in 2017-2018. In addition, detection data, including species, year, population and insecticide, were compared and statistically analyzed. [Results] 1. Significant differences were found in the susceptibility of the three vegetable aphids to the insecticides tested. M. persicae was 12.7- and 15.5-fold, respectively, less susceptible than B. brassicae and L. erysimi. 2. No significant difference in susceptibility was detected among different populations of B. brassicae in Guiyang, Qianxi and Xifeng, and in populations of L. erysimi in Guiyang and Zunyi. 3. Susceptibility of M. persicae and B. brassicae decreased by 2.2- and 1.9-fold from 2017 to 2018. The susceptibility of the Guiyang population M. persicae to nitenpyram, thiacloprid, thiamethoxam, chlorpyrifos, clothianidin and cyantraniliprole also significantly decreased by 5.6- to 115.0-fold over this period, and the susceptibility of the Guiyang population of B. brassicae to lambda-cyhalothrin, sulfoxaflor, chlorpyrifos, imidacloprid and thiamethoxam decreased by 2.1- to 6.7-fold. [Conclusion] Most insecticides that are highly toxic to B. brassicae and L. erysimi can be used to control these two aphid species. Thiamethoxam and cyantraniliprole should be used in rotation. M. persicae was not sensitive to most of the tested insecticides and rapidly develops resistance to these. Sulfoxaflor, imidacloprid and pirimicarb will only be temporarily effective against M. persicae in Guizhou province. New insecticides that are effective against M. persicae are urgently required.