Viroids are important pathogens of many plants. In citrus trees Citrus exocortis viroid (CEVd) and Citrus viroidⅡ(CVd-Ⅱ,known as Hop stunt viroid, HSVd) can cause the dwarf of citrus trees, decrease growth vigor and fruit production. These two viroids also can infect grapevine. However, they usually do not induce any visible symptoms. In this study, the viroids in citrus and grapevine trees grown in China were detected and their molecular characteristics were analysized.
The results showed that 2 samples were infected with CEVd and this was the first report of CEVd from grapevine in China. The infection rate by HSVd was 35%.