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苹果树进行营养繁殖,至今已有两千多年的历史。人们不但用营养繁殖方法繁殖苹果品种,还以此途径繁殖苹果砧木,藉以保持其各种选定的优良性状。但是,由于长期营养繁殖的结果,使多种病毒病扩散,蔓延,为害日加严重。这些病毒病有的破坏枝叶的正常生长,有的破坏开花、结果,有的还造成部分枝干或全株死亡。据河北果树所对一些代表性苹果园调查,河北苹果染病毒病(主要是表现型病
Apple tree vegetative reproduction, has been more than two thousand years of history. People not only breed apple varieties by means of vegetative propagation, but also breed apple rootstocks in this way, in order to maintain their various selected good traits. However, as a result of long-term vegetative propagation, a wide range of virus diseases have been spread, spread and harmed by harm. Some of these virus diseases destroy the normal growth of branches and leaves, and some destroy and bloom. As a result, some branches or whole plants also die. According to a survey of some representative apple orchards in Hebei fruit trees, apple diseases in Hebei Province (mainly phenotypic disease