Main Characters Identification and Evaluation of Some Disease-resistant Varieties in Sweet Potato

The 9 characters(such as the fresh yield of root, the fresh yield of stem and the dry matter contain of root, and so on)of the 9 disease resistance varieties(strains) were identified at the 3 different sites, and the relational analysis was used to evaluate comprehensively the 9 varieties (strains) in sweet potato. The results showed that American No.7 and Quanshu 647 had good multifactional characters, and would be good sweet potato varieties(strains) in Fujian Ralstonia solanacearum areas, and would be good resources to disease resistance breeding in sweet potato. Xushu 3773,Quanshu 721 and Quanshu 848 all had high fresh root yield, and would be good resources for disease resistance breeding.