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辽宁省苹果栽培始于1902年,目前面积已达324万亩,株数已达7146万株。80多年来,因受条件的限制,一直没有进行脱毒栽培,多数苹果树都在承受病毒的慢性为害,使之抗逆性降低,产量也不能大幅度的提高。因此无毒化是今后苹果栽培的方向。苹果病毒种类很多,目前在我国已明确的有6种,即:苹果锈果病毒、苹果花叶病毒、苹果绿皱果病毒、苹果褪绿叶斑病毒、苹果茎痘病毒和苹果茎沟槽病毒。这6种病毒,依其侵染苹果树后的反应特点,又可分为非潜隐性病毒和潜隐性病毒两大类。在上述6种病毒中,前三种为非潜隐性病毒,后3种为潜隐性病毒。
Liaoning Province, apple cultivation began in 1902, the current area has reached 3.42 million mu, the number of strains has reached 71.46 million. For more than 80 years, due to the restriction of conditions, virus-free cultivation has been carried out for a long time. Most apple trees suffer from the chronic damage of the virus, thus reducing their resistance and their yield can not be greatly increased. Therefore, non-toxic apple cultivation direction in the future. There are many types of apple viruses. At present, six species have been identified in our country, namely apple rust virus, apple mosaic virus, apple green wrinkle virus, apple chlorotic leaf spot virus, apple stem pox virus and apple stem groove virus. These 6 kinds of viruses, according to the response characteristics of their infection of apple trees, can be divided into two categories of non-latent virus and latent virus. Among the above six viruses, the first three are non-latent viruses and the last three are latent viruses.