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首次在陕西榆林发现针叶小爪螨危害樟子松。经用7种化学药剂野外防治试验，其中三氯杀螨醇、克螨特、双甲脒施药3天后虫口减退率均达85％以上。
For the first time found in Yulin, Shaanxi conch mites harm Pinus sylvestris. After seven kinds of chemical field prevention and control tests were carried out, the rate of population decline was over 85% after 3 days of dicofol, propargite and amitraz.