我国需要更新的老果园占相当大的比重,这些老园,树龄大,树体残缺,品种老化,树势弱,产量低,品质差,经济效益仅为优良品种新园的50％左右。老果园更新再植会发生“再植病”,表现为幼苗成活率低,植株生长弱,根系发育不良,延迟结果,产量低等。“再植病”以桃和苹果最重,枣树较轻。防治措施 The old orchards in need of renewal in our country occupy a large proportion. These old gardens have large ages, tree defects, aging varieties, weak shrubs, low yields and poor quality, and the economic benefits are only about 50% of the fine varieties of new gardens. The regeneration of the old orchard replantation “replantation” occurs, showing the survival rate of seedlings is low, plant growth is weak, poor root development, delayed results, low yield. “Replantation” to peach and apple heaviest, jujube lighter. Prevention