苏家屯区共有老苹果梨园800hm2，保存株数13万株。这些苹果梨树大多是60—70年代栽植的，因管理粗放，树势衰弱，有的树冠残缺不全。1989年全区苹果梨总产量仅1078t，株产仅．3kg，病虫果和畸形果率高达30％以上，～等果率仅占10％左右，全区年收益仅为328万元，平均每666．7m? There are 800 hmong old apple orchards in Sujiatun District with 130,000 preserved plants. Most of these apple pear trees were planted in the 60s-70s. Due to the extensive management, the trees are weak and some have incomplete crown. In 1989 the whole area apple pear total output is only 1078t, strain only. 3kg, pests and diseases and malformation fruit rate as high as 30%, ~ 10% fruit rate only about the region’s annual revenue is only 3280000 yuan, an average of 666.7m?