Currently, pomelo trees in Vietnam also have been considered as one of major fruit trees, because, apart from nutritional and economic values, pomelo trees have other outstanding features such as easy preservation, less damage during transport and easy cultivation, especially, good resistance to Greening disease, that is one of the most dangerous disease for the existence and development many species of citrus fruit trees (Department of plant Protection, 2006; Pham Thi Dung, 2014; Le Luong Te, 2007).