To study the resistance of cucurbit crops against cucumber mosaic virus (CMV) by aphid transmission, a field test was performed. Numbers of plants showing symptoms were checked at successive days. Infection and concentration of CMV were checked by ELISA. The results showed that cucumber cultivars were generally resistant against CMV but that CMV concentration varied depending on cultivars. “Sachinari” revealed to contain CMV in high concentration, but out of ten plants, only two showed mosaic symptoms. “Natsusango” showed strong resistance in both symptomatology and virus concentration. Each melons showed low levels of resistance against CMV infection, however generally CMV concentration was not high.
