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Chinese Journal of Biological Control ›› 2021, Vol. 37 ›› Issue (3): 436-442.DOI: 10.16409/j.cnki.2095-039x.2021.01.026

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Pathogenicity of Beauveria bassiana to Tetranychus urticae Koch (Acari: Tetranychidae) and Its Indirect Effects on Phytoseiulus persimilis (Acari: Phytoseiidae)

XU Huaping1,2, HE Xiaoyong3, JIANG Hongli4, ZHANG Hui5, LEI Zhongren2, XIE Haicui1, WU Shengyong2   

  1. 1. Hebei Normal University of Science and Technology, Qinhuangdao 066004, China;
    2. State Key Laboratory for Biology of Plant Diseases and Insect Pests/Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    3. Inner Mongolia Academy of Agriculture & Animal Husbandry Sciences, Hohhot 010031, China;
    4. Liuhe Distruct Agricultural Technology Extension Center, Nanjing 211500, China;
    5. Beijing ECO-SAF Technology co., Ltd, Beijing 101102, China
  • Received:2020-07-28 Online:2021-06-08 Published:2021-06-16

Abstract: The spider mite Tetranychus urticae Koch (Acari:Tetranychidae) is a worldwide pest of economic crops and vegetables. In order to determine the feasibility of combined application of Beauveria bassiana and predatory mites to control T. urticae. The pathogenicity of B. bassiana (GZGY-1-3) conidial suspension with different concentrations to T. urticae was determined; the predatory mite Phytoseiulus persimilis Athias-Henriot (Acari:Phytoseiidae) was fed with T. urticae after spraying B. bassiana for 16 h, 24 h, 36 h and 48 h, respectively, then the lethal rate, growth and fecundity of P. persimilis were measured. The results indicated that the corrected mortality of T. urticae increased with the increase of conidia concentration of B. bassiana, the corrected mortality of T. urticae was the highest at the concentration of 1×108 conidia/mL of B. bassiana, the LT50 of B. bassiana to T. urticae was 5.0 d under this conidia concentration of B. bassiana, and the LC50 of B. bassiana to T. urticae was 1.37×106 conidia/mL. After feeding on T. urticae infected by B. bassiana, with the extension of spraying time, the deutonymph, preoviposition and generation duration of P. persimilis were significantly prolonged, and the oviposition per female decreased in the F0 generation; there was no significant difference in each developmental stage duration and oviposition per female among the treatments in the F1 generation. This study proved that B. bassiana GZGY-1-3 is a highly virulent strain to T. urticae, the sublethal effect on P. persimilis was low within the safety period. The results provide a theoretical support for the control of T. urticae by combined application of B. bassiana and P. persimilis.

Key words: Tetranychus urticae, predatory mite, Beauveria bassiana, combined application, compatibility

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