双丙环虫酯对小贯小绿叶蝉的防治效果及残留评价

双丙环虫酯是一种由天然产物衍生而成的新型生物源杀虫剂,为明确其在茶园小贯小绿叶蝉防治中的应用效果,通过多地的药效试验和示范试验,综合分析了双丙环虫酯可分散液剂对小贯小绿叶蝉的防治效果和在茶叶中的残留情况。两个地区的药效试验结果表明,在有效成分用量为15.00 g·hm^-2和22.50 g·hm^-2剂量下,50 g·L^-1双丙环虫酯可分散液剂药后1 d的防治效果为88.6%~93.4%,药后14 d为75.5%~85.5%,防治效果优于小贯小绿叶蝉的主要防治药剂虫螨腈,具有较好的速效性和持效性。在有效成分用量为18.75 g·hm^-2剂量下,7个地区的示范试验结果显示,药后3 d的防治效果为88.9%~100.0%,药后14 d为60.2%~100.0%,防治效果优于当地常用防治药剂;药后7 d绿茶中双丙环虫酯的残留量在0.17~0.64 mg·kg^-1,泡茶过程中双丙环虫酯从干茶到茶汤的浸出率为17.1%~19.1%;茶叶中双丙环虫酯残留的风险熵值远小于1,通过饮茶摄入双丙环虫酯引起的健康风险极低。因此,双丙环虫酯具有有效成分用量低、防治效果好、健康风险低等优点,适用于茶园小贯小绿叶蝉的抗性管理和综合治理。

The Control Efficiency of Afidopyropen to Tea Green Leafhoppers and Evaluation of Residue in Tea

Afidopyropen is a novel biogenic insecticide derived from the natural fermentation product. This study aimed to evaluate the feasibility of afidopyropen for tea green leafhoppers (Empoasca onukii Matsuda) control and tea safety after the application of afidopyropen in tea garden. The dosage field trials and demonstration trials were conducted to evaluate the control efficiency of afidopyropen to tea green leafhoppers and the terminal residues in tea. The results of the dosage field trials in 2 locations show that 50 g·L^-1 afidopyropen dispersible concentrate was more effective against the green leafhoppers than chlorfenapyr which was commonly used pesticide for the green leafhoppers control. At the dosages of 15.00 g·hm^-2 and 22.50 g·hm^-2, control efficiencies were 88.6%-93.4% on the 1st day after treatment and 75.5%-85.5% on the 14th day, demonstrating a quick control effect and good persistence. At the dosage of 18.75 g·hm^-2 in 7 locations, the control efficiencies were 88.9%-100.0% on the 3rd day after treatment, and 60.2%-100.0% on the 14th day, which were better than the local commonly used pesticides. The terminal residues of afidopyropen in green tea ranged from 0.17-0.64 mg·kg^-1 on the 7th day after the application, the leaching rate of afidopyropen from dry tea to tea brew ranged from 17.1%-19.1% during the brewing process, and the risk quotient values were far less than 1, indicating a very low health risk caused by the afidopyropen intake through drinking tea. In conclusion, afidopyropen is suitable for resistance management and comprehensive management of tea green leafhoppers with the advantages of low dosage, high-efficiency and low-healthy risk for tea consumer.