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journal1 ›› 2016, Vol. 32 ›› Issue (1): 19-24.DOI: 10.16409/j.cnki.2095-039x.2016.01.003

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Safety Assessment of Pesticides Targeted at non-Lepidopteran Rice Pests to Trichogramma japonicum (Hymenoptera: Trichogrammatidae)

WANG Zichen1,2, TIAN Junce2, WANG Guorong3, ZHENG Xusong2, ZANG Liansheng4, ZHANG Dayu1, LÜ Zhongxian1,2   

  1. 1. College of Agriculture and Food Science, Zhejiang Agriculture and Forestry University, Lin'an 311300, China;
    2. Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China;
    3. Xiaoshan Agriculture Bureau, Hangzhou 211203, China;
    4. Institute of Biological Control, Jilin Agricultural University, Changchun 130118, China
  • Received:2015-04-30 Online:2016-02-08 Published:2016-02-22

Abstract: Trichogramma japonicum, an egg parasitoid is commonly used to control Lepidopteran insect pests of rice. For evaluating the impacts of five pesticides (validamycin, triadimefon, pymetrozine, azadirachtin and chlorpyrifos) targeting non-Lepidopteran rice pests or rice diseases, such as the rice planthoppers, rice blast and sheath blight on T. japonicum, pesticide film and dipping methods were conducted for determining the safety of the tested pesticides to different developmental stages of T. japonicum. Results of pesticide film method indicated that LC50 of chlorpyrifos to T. japonicum adults was 0.382 mg/L, showing extremely high risk and LC50 of triadimefon was 49.539 mg/L with high risk, while LC50 of the three other tested pesticides was more than 2000 mg/L meaning limited risk to T. japonicum adults. Results of the pesticide dipping method demonstrated that all treatments of chlorpyrifos at four preimaginal developmental stages significantly reduced the emergence rate and increased deformity of T. japonicum, and all treatments of validamycin, triadimefon and pymetrozine at four preimaginal developmental stages significantly reduced the emergence rate of T. japonicum, while the adult deformity was significantly increased by validamycin treated at larval and pupal stages, as well as triadimefon and pymetrozine treated at egg, larval and pupal stages. No significant difference was found on emergence rate and deformity of T. japonicum between azadirachtin treatment and the control. In conclusion, triadimefon and chlorpyrifos are high risk to all developmental stages of T. japonicum. Azadirachtin is safe to T. japonicum.

Key words: rice, pesticide, Trichogramma japonicum Ashmead, safety assessment

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