Cluster Analysis on Resistance of Watermelon Rootstocks against Meloidogyne incognita Infection

Growth and disease-resistance of 13 watermelon rootstocks were analyzed using cluster analysis and subordinate function index. The rootstocks artificially infected by Meloidogyne incognita were planted in pots for the experimentation. The results showed the variety, Jingxinzhenwang, to be the strongest in resisting the disease with a subordinate function index score of 5.70, and Yongshi the weakest with a score of 3.50.The information would be critical for selecting and utilizing appropriate watermelon rootstocks.