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Study on the Pesticide Safety Control against Tea Leaf Beetle Basilepta melanopus

QIU Huan1,2, TAN Rongrong2, CHEN Xun2, WANG Hongjuan2, HUANG Danjuan2, WU Peizhuo2, ZHU Fen1, JIAO Long2*, MAO Yingxin2*   

  1. 1. College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; 2. Key Laboratory of Tea Resources Comprehensive Utilization of Ministry of Agriculture and Rural Affairs, Fruit and Tea Research Institute, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
  • Online:2025-10-31 Published:2025-10-31
  • Contact: JIAO Long,1262181642@qq.com;MAO Yingxin,maoyingxin@126.com

Abstract: The indoor efficacy of eight chemical pesticides and six biological pesticides against Basilepta melanopus adult was evaluated using the leaf-dipping method. Field control efficacy trials were conducted to screen the pesticides for controlling B. melanopus adult, and the residues of these pesticides in dry tea were measured seven days after application. The results show that in the indoor efficacy test, 72 h after I-cyhalothrin (effective component 16.5 mg·L-1), bifenthrin (effective component 55.6 mg·L-1), chlorfenapyr (effective component 143 mg·L-1), thiacloprid (effective component 124 mg·L-1), tolfenpyrad (effective component 165 mg·L-1), pyriproxyfen-chlorfenapyr (effective component 165 mg·L-1) and natural pyrethrum (effective component 52.8 mg·L-1) had higher lethality to the adult of B. melanopus, with lethality rates of 100%, 100%, 100%, 100%, 100%, 95% and 80%, respectively. Next were pyriproxyfen (effective component 14 800 mg·L-1) and azadirachtin (effective component 16.5 mg·L-1), with the lethality rates of 50% and 27.5%. The lethality rates of buprofezin, Empedobacter brevis, tea saponin, cineole, Metarhizium anisopliae CQMa421 were not significantly different from the clear water control. The maximum control efficacies of I-cyhalothrin (effective component 16.88 g·hm-2), bifenthrin (effective component 56.25 g·hm-2), chlorfenapyr (effective component 201 g·hm-2), and natural pyrethrum (effective component 36 g·hm-2) against B. melanopus adult after field application for 1~7 d were up to 100%, 100%, 93.99% and 40.82%, respectively. After 7 days of pesticide application, the residues of bifenthrin and chlorfenapyr were both lower than the maximum residue limits (MRL) in national standard (GB 2763—2021) and EU standard for pesticides in tea. Whereas the residue of I-cyhalothrin was only lower than the MRL in GB 2763—2021. Although the field control efficacy of thiacloprid (effective component 126 g·hm-2) could be 98.31%, the residue in dry tea produced 7 days after application exceeded the MRLs in both GB 2763—2021 and EU standards. In conclusion, bifenthrin, chlorfenapyr, I-cyhalothrin and natural pyrethrum can be selected as needed for the control of B. melanopus adult in tea plantations.

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