内蒙哲盟开鲁县果树园是36年的老果园。果树总面积440亩、其中梨树占200亩。1993年发现梨树叶片上、果实上有梨木虱为害．受害率达90％以上。我们连续4年对个网的梨木虱发生情况进行了调查．同时进行了药剂防治试验，取得显著效果。一、梨木虱的发生规律梨木虱一年发生4～5代． Inner Mongolia and Inner Mongolia Kailu County Orchard is 36 years old orchard. The total area of ​​fruit trees is 440 mu, including 200 mu of pear trees. In 1993, it was found that there were pear psylla on the leaves of pear tree. Damage rate of 90% or more. We conducted a survey of the occurrence of pear psylla in four consecutive years. At the same time, the drug prevention and control test was carried out and achieved remarkable results. First, the occurrence of pear lice Pear lice occur 4 to 5 generations a year.