China has limited acaricide options for tea plantations.Cyetpyrafen,a novel domestic acaricide with high efficacy,low toxicity and a negative temperature coefficient,offers an alternative for tea pest control;however,...China has limited acaricide options for tea plantations.Cyetpyrafen,a novel domestic acaricide with high efficacy,low toxicity and a negative temperature coefficient,offers an alternative for tea pest control;however,its residue fate in tea remains unclear.This study developed a method to simultaneously detect cyetpyrafen and its metabolites(M-309,M-325-1,and M-409-3)in different tea matrices to investigate their fate.Recoveries of compounds ranged from 73.4 to 106.2%with the relative standard deviations(RSDs)below 12.0%.During tea cultivation,the dissipation half-life of cyetpyrafen was 0.59 d,with M-309 as a major metabolite.The residues of cyetpyrafen and M-309 were affected by different processing stages,especially water loss and high temperatures during fixing,drying and withering.The total processing factors ranged from 1.39 to 1.71 for green tea and 1.48 to 2.28 for black tea(processed from fresh tea leaves sampled at 1,5,and 7 d),respectively.The leaching rates of cyetpyrafen from green tea and black tea into tea infusions were 7.4 and 6%,respectively.The risk associated with cyetpyrafen intake from tea consumption was low,with risk quotient values below 100%.However,theoretical calculation indicated potential harm to non-target organisms from its metabolites.This research provides a reference for the safe and efficient use of cyetpyrafen in tea gardens.展开更多
【目的】苹果全爪螨Panonychus ulmi是为害苹果树的主要害螨之一,大发生年份给苹果树的生长发育及产量造成严重影响。目前化学药剂仍然是防治苹果全爪螨的主要手段,因此为筛选出苹果全爪螨最佳防治药剂和最适助剂、减少农药使用量,本文...【目的】苹果全爪螨Panonychus ulmi是为害苹果树的主要害螨之一,大发生年份给苹果树的生长发育及产量造成严重影响。目前化学药剂仍然是防治苹果全爪螨的主要手段,因此为筛选出苹果全爪螨最佳防治药剂和最适助剂、减少农药使用量,本文以阿维菌素、哒螨灵、联苯肼酯、乙唑螨腈作为供试药剂,青皮桔油、农用有机硅助剂为增效剂进行试验。【方法】采用琼脂浸叶法对苹果全爪螨进行室内毒力测定,并用茎叶喷雾法进行田间药效试验。【结果】室内毒力测定24 h后,阿维菌素、哒螨灵、联苯肼酯、乙唑螨腈对苹果全爪螨LC_(50)值分别为2.711、16.031、4.534和1.768 mg/L。阿维菌素、哒螨灵、联苯肼酯、乙唑螨腈各减量30%后分别与青皮桔油、农用有机硅助剂混配,24 h后2种增效剂均有明显的增效作用。田间试验阿维菌素1.35-2.70 g a.i./hm^(2)剂量下药后1 d,防效为67.35%-82.31%。乙唑螨腈在2.70 g a.i./hm^(2)剂量下药后3和7 d,防效均在90%以上。30%乙唑螨腈悬浮剂1.42 g a.i./hm^(2)+青皮桔油和30%乙唑螨腈悬浮剂1.42 g a.i./hm^(2)+农用有机药后1,3和7 d防效均优于其它处理组。【结论】阿维菌素和乙唑螨腈均可有效防治苹果全爪螨,可配合增效剂交替使用减少农药施用量,为新疆苹果园叶螨绿色防控提供科学依据。展开更多
基金financially supported by the National Key Research and Development Program of China(2022YFD1600803)the National Natural Science Foundation of China(31772077)+1 种基金the Yunnan Provincial Tea Industry Technology Innovation Center,China(202505AK340010)the Chinese Academy of Agricultural Sciences for Agricultural Science and Technology Innovation Program of Tea Research Institute(CAAS-ASTIP-2021-TRI)。
文摘China has limited acaricide options for tea plantations.Cyetpyrafen,a novel domestic acaricide with high efficacy,low toxicity and a negative temperature coefficient,offers an alternative for tea pest control;however,its residue fate in tea remains unclear.This study developed a method to simultaneously detect cyetpyrafen and its metabolites(M-309,M-325-1,and M-409-3)in different tea matrices to investigate their fate.Recoveries of compounds ranged from 73.4 to 106.2%with the relative standard deviations(RSDs)below 12.0%.During tea cultivation,the dissipation half-life of cyetpyrafen was 0.59 d,with M-309 as a major metabolite.The residues of cyetpyrafen and M-309 were affected by different processing stages,especially water loss and high temperatures during fixing,drying and withering.The total processing factors ranged from 1.39 to 1.71 for green tea and 1.48 to 2.28 for black tea(processed from fresh tea leaves sampled at 1,5,and 7 d),respectively.The leaching rates of cyetpyrafen from green tea and black tea into tea infusions were 7.4 and 6%,respectively.The risk associated with cyetpyrafen intake from tea consumption was low,with risk quotient values below 100%.However,theoretical calculation indicated potential harm to non-target organisms from its metabolites.This research provides a reference for the safe and efficient use of cyetpyrafen in tea gardens.
文摘【目的】苹果全爪螨Panonychus ulmi是为害苹果树的主要害螨之一,大发生年份给苹果树的生长发育及产量造成严重影响。目前化学药剂仍然是防治苹果全爪螨的主要手段,因此为筛选出苹果全爪螨最佳防治药剂和最适助剂、减少农药使用量,本文以阿维菌素、哒螨灵、联苯肼酯、乙唑螨腈作为供试药剂,青皮桔油、农用有机硅助剂为增效剂进行试验。【方法】采用琼脂浸叶法对苹果全爪螨进行室内毒力测定,并用茎叶喷雾法进行田间药效试验。【结果】室内毒力测定24 h后,阿维菌素、哒螨灵、联苯肼酯、乙唑螨腈对苹果全爪螨LC_(50)值分别为2.711、16.031、4.534和1.768 mg/L。阿维菌素、哒螨灵、联苯肼酯、乙唑螨腈各减量30%后分别与青皮桔油、农用有机硅助剂混配,24 h后2种增效剂均有明显的增效作用。田间试验阿维菌素1.35-2.70 g a.i./hm^(2)剂量下药后1 d,防效为67.35%-82.31%。乙唑螨腈在2.70 g a.i./hm^(2)剂量下药后3和7 d,防效均在90%以上。30%乙唑螨腈悬浮剂1.42 g a.i./hm^(2)+青皮桔油和30%乙唑螨腈悬浮剂1.42 g a.i./hm^(2)+农用有机药后1,3和7 d防效均优于其它处理组。【结论】阿维菌素和乙唑螨腈均可有效防治苹果全爪螨,可配合增效剂交替使用减少农药施用量,为新疆苹果园叶螨绿色防控提供科学依据。
