Monitoring insecticide resistance in field populations ofThrips hawaiiensis (Morgan) in Hainan

Author of the article:FU Bu-Li1, 2** LIU Jun-Feng1 QIU Hai-Yan1 TANG Liang-De1LIN Jun4 ZENG Dong-Qiang2 XIE Yi-Xian1

Author's Workplace：1. Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China；2. Institute of Pesticide and Environment Toxicology, Guangxi University, Nanning 530005, China;3. The Ministry of Agriculture Key Laboratory of Intergrated Pest Management of Tropical Crops, Haikou 571101, China;4. Dow AgroSciences Co. Ltd. Shanghai Branch, Shanghai 201203, China

Key Words：banana, Thrips hawaiiensis, insecticide resistance, monitoring, pest management

Abstract：

     [Objectives]  To evaluate current levels of insecticide resistance in Thrips hawaiiensis, and provide information to improve the management of this pest. [Methods]  The resistance of T. hawaiiensis collected from four populations on Hainain; Changjiang, Chengmai, Lingao and Dongfang, to ten insecticides was tested using the leaf-tube residual bioassay (TIBS) from 2013 to 2015. [Results]  Although decreased susceptibility was observed in all four populations from 2013 to 2015, all four were still relatively sensitive to the most insecticides tested. All populations were sensitive to traditional insecticides, including emamectin-benzoate, chlorpyrifos and betacy permethrin, and novel insecticides such as spinetoram, cyantraniliprole, and spirotetramat (resistance ratios＜5). However, all four populations developed moderate resistance (resistance ratios of 15.19, 11.19, 17.46, 13.58 fold, respectively) to acetamiprid compared to a susceptible laboratory strain. All four populations had low resistance to abamectin (resistance ratios of 9.06、8.95、13.35、6.57 fold, respectively). Moreover, the Dongfang population had low resistance to spinosad and imidacloprid (resistance ratios of 7.11, 7.48 fold, respectively), and the Lingao population also had low (8.28 fold) resistance to imidacloprid. [Conclusion]  Excessive use of acetamiprid and abamectin should be avoided. To delay the development of insecticide resistance in T. hawaiiensis, insecticides should be used in rotation, and in combination, to control this pest.