双甲脒是一种高效、安全的选择性杀螨剂,1982～1983年中国农科院果树研究所用此药对苹果树叶螨类进行了数效测定、残效试验和田间防治试验,对叶螨的主要天敌进行了杀毒测定。试验结果证明,双甲脒对叶螨的各种虫态均有良好的触杀和熏蒸作用。于苹果落花后,使用0.01～0.02％浓度时,有效控制期可长达40～50天,防治苹果叶螨效果好,尤 Amitriptyline is a highly effective and safe selective acaricide. In 1982-1983, the fruit tree research institute of Chinese Academy of Agricultural Sciences conducted the number-effectiveness test, residual effect test and field control test on mite of apple tree with this drug. The main natural enemies were antiviral assay. The test results show that amitraz pairs of spider mites in various states have a good contact and fumigation. After the apples fall, the effective control period can be as long as 40 to 50 days when the concentration is 0.01% to 0.02%, and the effect is good for controlling spider mites