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試驗用萊檬(Citrus aurantifolia)及麻疯柑(C.hystrix)作指示植物,用两广黃龙病区病株接穗嫁接接种,表現脉明、叶脉木栓化、茎部凹斑、及矮化、小叶等典型退化病毒(tristeza virus)所致症状,可知我国柑桔黄龙病与国外柑桔退化病(tristeza)系同一种病毒(或病毒群)所致。无病区的四川江津、湖南溆浦和北京的健康甜橙、桔类、及北京檸檬也带有黄龙病毒,可見黄龙病毒的分布远较病区为广。各种柑桔上所带黄龙病毒株系的強弱不同;在碰柑上的为强毒系,甜橙上的为强毒系或较弱毒系,桔类及北京檸檬上的各别为較弱毒系及弱毒系。
Citrus aurantifolia and C. hystrix were used as the indicator plants for inoculation with the scion of diseased plants of both Guangdong and Huanglong ward, , Leaflets and other typical symptoms caused by tristeza virus (tristeza virus), we can see the citrus Huanglong disease and citrus detritus (tristeza) is the same virus (or virus group) caused by. The wu-jiang in Sichuan Jiangjin, Hunan Xupu and Beijing’s healthy oranges, oranges, and Beijing lemon also with yellow dragon virus, shows that the distribution of yellow dragon virus is much wider than the ward. On a variety of citrus Huanglonglongsi strains carrying the strength of different; in the touch of orange for the virulent strains, sweet orange on the virulent strains or weaker strains, oranges and Beijing lemon on the respective weaker poison Department and the Department of weak.