Susceptibility of Seven Caladium ( × ) Cultivars to , , , , and .

There is no known root-knot nematode ( spp.) resistance in caladium ( × ), an ornamental foliage crop grown from tubers, but cultivars have been reported to differ in their level of susceptibility. Research was conducted to assess the relative susceptibility of seven widely grown caladium cultivars to the species of which occur in the southeastern United States, where caladium cultivars are commonly planted in commercial and residential landscapes. Root-knot nematode species tested were , (), , , and . All of the caladium cultivars tested were susceptible to galling by all species of tested; however caused the least severe galling. produced high numbers of eggs per gram of fresh root on all cultivars tested, with cv. Freida Hemple having the highest number (14,799 eggs/g fresh root). also reproduced at a high level on most cultivars tested. Overall, the number of eggs of , , and was low on all caladium cultivars tested. was isolated from caladium roots in high numbers regardless of the cultivar. had low numbers of second stage root-knot nematode juveniles (J) isolated from soil of all cultivars. The high level of reproduction of and the high rate of isolation of from roots, as well as the low rate of isolation of from soil, are not reflected in gall ratings where ratings were low but high numbers of eggs and J were present in roots. An increased understanding of cultivar susceptibility levels and the reproductive capacity of common root-knot nematode on caladium under various environmental conditions is needed to better manage nematode-infested planting sites and improve caladium growth.