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Chinese Journal Of Biological Control ›› 2020, Vol. 36 ›› Issue (4): 551-557.DOI: 10.16409/j.cnki.2095-039x.2020.04.006

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Acaricide Toxicity to Tetranychus cinnabarinus Boisduval and Safety to Neoseiulus californicus (McGregor)

JIANG Chunxian, TIAN Yajing, LI Qing, WANG Haijian, YANG Qunfang   

  1. College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
  • Received:2019-11-07 Online:2020-08-08 Published:2020-08-07

Abstract: Toxicity of 6 acaricides B-azolemiteacrylic, cyflumetofen, extoxazole, pyridaben, spirodiclofen and bifenazate to Tetranychus cinnabarinus Boisduval was measured by slide dipping, leaf residual and leaf dipping methods. Their safety to Neoseiulus californicus (McGregor) was assessed in terms of female adult survival rate and egg hatching rate of N. californicus. The results showed that toxicities of the 6 acaricides measured by leaf residual were higher than those by slide dipping method. The female adults of T. cinnabarinus were not susceptible to spirodiclofen and extoxazole while the other acaricides showed high toxicity to T. cinnabarinus. The field dose of pyridaben significantly reduced the survival rate of adult N. californicus. The mortality rate of N. californicus treated with 10 times field dose pyridaben was 100%. The hatching rates of N. californicus treated with field dose extoxazole and pyridaben were only 1% and 0.33%, respectively. When using N. californicus to control harmful mites, application of extoxazole and pyridaben should be avoided in the field.

Key words: Neoseiulus californicus, Tetranychus cinnabarinus, acaricides, toxicity bioassay, safety assessment

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