为筛选出适于根区施药防治棉田二斑叶螨的杀螨剂,华南农业大学天然农药与化学生物学教育部重点实验室研究人员以乐果为参照,采用喷雾法、浸叶法、水培法和土培法,测定了12种药剂对二斑叶螨的毒力。结果表明,通过喷雾法筛选出活性高于乐果的9种药剂;进一步浸叶法发现虫螨腈和嘧啶氧磷的活性高 In order to screen for the acanthopanacid that is suitable for the root zone application and control two-spotted spider mite in cotton field, the key laboratory of the Ministry of Education of Natural Pesticide and Chemical Biology of South China Agricultural University took the dimethoate as the reference and adopted the methods of spraying, Hydroponics and soil culture were used to determine the toxicity of 12 agents to Tetranychus urticae. The results showed that 9 pesticides with higher activity than dimethoate were screened by spray method. The activity of chlorfenapyr and pyrimidinephos