Selection of control chemicals for Tetranychus urticae Koch
Author of the article:LI Qiang；MEN Xing-Yuan；XU Qing-Fang；YU Yi；ZHANG An-Sheng；SUN Ting-Lin；LI Li-Li
Author's Workplace：Key Laboratory for Plant Virology of Shandong, Institute of Plant Protection,Shandong Academy of Agricultural Sciences, Jinan 250100, China
Key Words：Tetranychus urticae; control pesticides; control strategy
Abstract：[Objectives] In order to solve the problems of high resistance, undeal effect and large dosage in the control of Tetranychus urticae in orchards, the control effects of registered pesticides and pesticides in use in orchards on Tetranychus urticae were evaluated. [Methods] The toxicity of 10 registered pesticides and 9 pesticides in use in orchards on T. urticae were bioassayed in lab. [Results] Eighty percentage of the registered pesticide got bad effect, which was less than 66.67%. Only Amitraz and Avermectin had more than 92.68% control effect in 48 hours. Spirodiclofen, tebufenozide and thiacloprid, which are used currently in orchards, all showed good control effect, which could reach 84.09%-100% within 48 hours. [Conclusion] At present, more than 80% of the registered single pesticides have lost their control effect on T. urticae, which is the main reason for the bad control effect in orchards. Spirodiclofen, tebufenozide and thiacloprid, have good control effect on T. urticae. our result suggests to add the registration of highly effective pesticides or change the pesticides, which can ensure the control effect, reduce the dosage of pesticides and increase the accuracy of medication system in orchards. Controlling T. urticae should not only rely on chemical pesticides, but also give full play to the natural control function of the orchard ecosystem, to decrease the insecticide-resistance.