A cultivated watermelon variety as scion was grafted on 5 wild cucurbitaceous species as rootstock.The effects of graft on resistance to withered wilt of watermelon were studied.The results demonstrated that there was high affinity between every rootstock of 5 wild species and scion,all the survival rate of grafted plants was above 90%.It also indicated that the grafted plants were better not only in their resistant levels to withered wilt,but also in root system,diameter of stem and leaf.The resistances o...