The muskmelon tongue root inarching grafts, used watermelon 1100, wax gourd 1202 and squash 1913 as rootstock, were studied for their efficacy in controlling root rot/vine decline of muskmelon. The above-ground rootstock tissues were excised at the grafting union by razor 3 weeks after transplanting. The survival rates of the rootstock plants were more than 80%. These results provided the basis for disease management of root rot/vine decline of muskmelon by graft culture. In 2004, a field experiment was conducted at Dongshan (in Tainan County) and Wax gourd 1202 and Squash 1913 were screened for their suitability as rootstock. In 2005, in further field experiments couducted at Chigu Ⅰ and Ⅱ (Tainan), the grafts on squash 1913 rootstock gave a stable, positive performance on disease management. Although the root of rootstock plants was also infected by M. cannonballus, they displayed a relatively low root rot index of 1.1 and 1.6 in the two fields, respectively. There were 54% of the total root numbers found to derive from the rootstock plant. By gravest time, the grafts showed a phenomenon of temporary wilting in which the plants wilted during the day and would recover at night or in a later time under certain circumstances. A normal harvest of high quality fruit of muskmelon was possible."