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1991～1998年，采用热处理（变温38～22℃）进行“双优”茎尖扇叶和卷叶病毒脱毒试验，定植茎尖继代（6～7代）脱毒苗建园，对其遗传稳定性和生产性能观察结果表明：1．0～2．0mm的茎尖脱毒率达68．75％，并易分生和继代培养。“双优”组培树与同品种的扦插树相比较，无论在树形、叶形、果实形态、品质（酒质）、抗寒性等均未出现明显变异。脱毒的组培树抗霜霉病，群体无性系生长一致，平均增产30．67％。脱毒的“双优”组培树具有稳定的遗传性状和生产性能。
From 1991 to 1998, the virus-free test of “double excellent” stem leaf blade and leafroll virus was carried out by heat treatment (variable temperature 38 ~ 22 ℃) The results of genetic stability and productive performance showed that: 1.0 ~ 2.0mm stem tip detoxification rate of 68.75%, and easy to meridians and subcultures. Compared with the same species of cuttage tree, “Shuangyou” tissue culture tree showed no significant variation in tree shape, leaf shape, fruit shape, quality (quality of wine), cold resistance and so on. Detoxification of tissue culture tree downy mildew, population clones consistent growth, an average increase of 30.67%. Detoxification “double superior” tissue culture tree has stable genetic traits and production performance.