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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (1): 117-122.doi: 10.11924/j.issn.1000-6850.casb2022-0050

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Laboratory Toxicity of Four Chemical Insecticides Against Agriophara rhombata

GONG Xuena(), WANG Xuesong, LUO Ziwen, CHEN Hongyun, WANG Yungang, LONG Yaqin(), CHEN Linbo()   

  1. Tea Research Institute, Yunnan Academy of Agricultural Sciences/Yunnan Technology Engineering Research Center of Tea Germplasm Innovation and Supporting Cultivation/Yunnan Provincial Key Laboratory of Tea Science, Kunming 650201
  • Received:2022-01-26 Revised:2022-08-17 Online:2023-01-05 Published:2022-12-27
  • Contact: LONG Yaqin,CHEN Linbo E-mail:gongxuena0321@sina.com;longyaqin19831212@126.com;chenlinbo2002@sina.com

Abstract:

To effectively control Agriophara rhombata, an important leaf-eating pest of tea trees in Yunnan Province, suitable drugs and dosages were screened out to guide the reasonable application of insecticides. In this study, the toxicity of four insecticides at different dilution rates to the 3rd A. rhombata from 24 to 96 h was determined by leaf dipping method in laboratory. The results showed that the toxicity sequence of the four chemical insecticides to the 3rd A. rhombata was as follows: from 24 to 72 h, spinetoram 6% SC> indoxacarb 15% EC> tolfenpyrad 15% SC> chlorfenapyr 24% SC. At 96 h, spinetoram 6% SC> chlorfenapyr 24% SC> indoxacarb 15% EC> tolfenpyrad 15% SC. Therefore, spinetoram 6% SC and indoxacarb 15% EC have strong toxicity and quick efficacy, which can be recommended for emergency control of A. rhombata. Chlorfenapyr 24% SC has slow effect and obvious time-dose-mortality effect. The study results will provide a reference basis for the control of A. rhombata in Yunnan tea planting area.

Key words: Agriophara rhombata, spinetoram, indoxacarb, tolfenpyrad, chlorfenapyr, laboratory toxicity

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