我国目前生产上主栽的葡萄品种都是带有病毒的,这对其产量和质量都有不良影响。美国的葡萄栽培已实现无毒化,所以其鲜食和制干葡萄均产量高,品质优。八十年代中期我国从美国引进一批无病毒葡萄良种,经过多年在东北、华北黄河故道各地试栽,已选出一批适应在各地栽植的优质丰产的大粒 At present, the main varieties of grapes cultivated in our country are all virus-bearing, which adversely affects their yield and quality. The United States has achieved non-toxic viticulture, so its fresh and dried grapes are high yield, excellent quality. In the mid-1980s, China imported a number of virus-free grapes from the United States. After years of trial planting in the old course of the Yellow River in the northeast and north China, a batch of large grain crops with high quality and high yield planted in various places have been selected