祁县峪口乡有1.1万亩旧苹果园,大部分是60年代定植的。最近几年,全乡各个果园均有苹果树腐烂病发生。我们在1984年10月15日抽样调查了6670株,病株率达到27.6％,平均每株病树有病斑2.1个。腐烂病的严重发生,威胁着全乡的苹果生产,引起了乡政府的极大重视。我们邀请了果树科技人员进 Qiyu Meiyukou Township 1.1 million mu of old apple orchards, most of the 60’s colonization. In recent years, all orchards in the township have apple tree rot disease. We sampled 6670 samples on October 15, 1984, and the diseased plants rate reached 27.6%. The average diseased tree has 2.1 spots per plant. The serious occurrence of rot disease threatens the production of apple in the whole country, which arouses the great attention of the township government. We invited the fruit trees science and technology personnel into