建立山地果园是黄土高原合理利用水土资源治理水土流失、使生态效益与经济效益紧密结合的有力措施之一。长期以来,位于黄土高原沟壑区的甘肃省庆阳地区大力推广山地果园,经过多年努力,取得了较好的成效。但是,随着新情况的出现,生态系统内依生种结构发生变化,果实食心虫类大量发生,严重影响了果品质量,威胁着果品生产.据调查,1979年庆阳地区部分果园苹果虫果率高达80～90％,其后又蔓延到全区。为了突破这个 The establishment of mountain orchards is one of the effective measures to make rational use of soil and water resources to control soil and water loss in the Loess Plateau so that ecological and economic benefits are closely integrated. For a long time, the mountain orchard in Gansu Province, which is located in the gully region of the Loess Plateau, has vigorously promoted the mountain orchard. After years of hard work, it has achieved good results. However, with the advent of new situations, the structure of eucalyptus species in ecosystems has changed, and the occurrence of echinoderms in fruits has occurred in large numbers, seriously affecting the quality of fruit products and threatening the production of fruit products. According to the survey, in 1979, Up to 80 ~ 90%, then spread to the region. In order to break this