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Chinese Journal of Biological Control ›› 2021, Vol. 37 ›› Issue (4): 725-731.DOI: 10.16409/j.cnki.2095-039x.2021.09.005

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Effects of Pyridaben on Safety and Predation Ability of Neoseiulus californicus (McGregor) (Acari: Phytoseiidae)

ZHANG Yuxin, JIANG Chunxian, LI Qing   

  1. College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
  • Received:2020-08-01 Published:2021-09-18

Abstract: To determine the direct effects of acaricides on natural enemies, the functional response of Neoseiulus californicus (McGregor) treated with sublethal concentrations of pyridaben to Tetranychus cinnabarinus (Boisduval) was determined. The results showed that the LC50 of pyridaben to T. cinnabarinus and N. californicus were 17.62 μg/mL and 119.89 μg/mL, respectively. The toxicity selective ratio (TSR) of the acaricide was 6.803, indicating that the pyridaben was safe to N. californicus. The daily consumption of the predator mites to T. cinnabarinus larvae was reduced from 43.80 to 41.80 in the control when the concentration was LC30. At the same time, the handling time Th was significantly prolonged. The predation ability (a/Th) of N. californicus on the larvae of T. cinnabarinus decreased the most. The a/Th of the LC10 and LC30treatment groups decreased from 53.71 in the control to 18.37 and 14.95, respectively, and the maximum reduction ratio was 72.16% in the LC30 group. The searching effect of the predator mite on all the stages of T. cinnabarinus, except nymph, was weakened by the sub-lethal treatment of pyridaben under the same prey density, whose amplitude ranked as:larvae>egg>adult. In conclusion, pyridaben will have some negative influence on the predation ability of N. californicus.

Key words: pyridaben, Neoseiulus californicus, toxicity selective ratios, functional responses

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