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用柑桔黄龙病同一病树的不同组织进行嫁接传播。单芽枝段为传病率高,其次是无芽枝段,叶碎片可以传病,而枝皮的传病率很低,甚至不传病。用同一病树的芽条于不同时期在田间嫁接繁殖,比较苗木的发病率。5～7月嫁接的苗木发病率显著低于一年中其它时期嫁接的。因而认为5～7月在田间进行有关嫁接传播试验以期反映病害的传染性是困难的。
Graft with different tissues of the same diseased tree of citrus Huanglongbing. Single bud branch of the disease rate is high, followed by no bud branch, leaf fragments can be transmitted, and the bark skin transmission rate is very low, do not even get sick. Buds of the same disease tree in different stages of grafting in the field to compare the incidence of seedlings. The incidence of grafted seedlings in May-July was significantly lower than that of grafts in other periods of the year. Therefore, it is difficult to conduct grafting spread test in the field from May to July in order to reflect the contagiousness of the disease.