广西地区柑橘全爪螨对虫螨腈和丁醚脲的抗药性监测

Monitoring of resistance of Panonychus citri to chlorfenapyr and diafenthiuron in Guangxi

为探究广西地区柑橘全爪螨Panonychus citri对虫螨腈和丁醚脲的抗药性变化情况,采用叶碟浸渍法测定了2022年-2024年广西阳朔、荔浦、武鸣、鹿寨、永福、灵川6地柑橘全爪螨对虫螨腈和丁醚脲的抗药性。室内生测结果表明:2022年5个种群对丁醚脲均处于中等水平抗性(39.2~78.7倍);阳朔、永福、荔浦种群对虫螨腈处于中等水平抗性(45.4~93.6倍),武鸣(192.6倍)、鹿寨(125.3倍)表现为高水平抗性。2023年阳朔种群为中等水平抗性,其余种群对虫螨腈和丁醚脲均已达高水平抗性。田间药效结果表明:240 g/L虫螨腈SC 1000倍液防治效果最好,药后1 d防效为76.7%,药后15 d可达98.9%。广西荔浦、武鸣、鹿寨、永福4地柑橘全爪螨种群对虫螨腈和丁醚脲已达高水平抗性,应暂停这2种药剂的使用。

This study aimed to investigate the changes in resistance of citrus mites to chlorfenapyr and diafenthiuron in Guangxi.The leaf plate immersion method was used to determine the resistance of citrus mites from Yangshuo,Lipu,Wuming,Luzhai,Yongfu,and Lingchuan in Guangxi from 2022 to 2024 to chlorfenapyr and diafenthiuron.Indoor bioassay results showed that in 2022,all five populations were at a moderate level of resistance to diafenthiuron(39.2-78.7 times),Yangshuo,Yongfu,and Lipu showed moderate resistance to chlorfenapyr(45.4-93.6 times),while Wuming(192.6 times)and Luzhai(125.3 times)showed high level of resistance.In 2023,the population in Yangshuo showed moderate resistance,while the rest of the population reached high level of resistance to chlorfenapyr and diafenthiuron.Field trials demonstrated that chlorfenapyr 240 g/L SC 1000-fold had the best control effect with efficacy of 76.7%after one day of treatment and up to 98.9%after 15 days of treatment.The citrus mites from Lipu,Wuming,Luzhai,and Yongfu in Guangxi have reached high level of resistance to chlorfenapyr and diafenthiuron,and their use should be suspended.