Journal of Nematology (2017) 49, 457-461

Nancy Kokalis-Burelle, Janete A. Brito and Robert D. Hartman (2017)
Susceptibility of seven Caladium (Caladium × hortulanum) cultivars to Meloidogyne arenaria, M. enterolobii, M. floridensis, M. incognita, and M. javanica
Journal of Nematology 49 (4), 457-461
Abstract: There is no known root-knot nematode (Meloidogyne spp.) resistance in caladium (Caladium x hortulanum), 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 Meloidogyne which occur in the southeastern United States, where caladium cultivars are commonly planted in commercial and residential landscapes. Root-knot nematode species tested were Meloidogyne arenaria, Meloidogyne enterolobii ( = M. mayaguensis), Meloidogyne floridensis, Meloidogyne incognita, and Meloidogyne javanica. All of the caladium cultivars tested were susceptible to galling by all species of Meloidogyne tested; however M. javanica caused the least severe galling. Meloidogyne enterolobii 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). Meloidogyne javanica also reproduced at a high level on most cultivars tested. Overall, the number of eggs of M. arenaria, M. floridensis, and M. incognita was low on all caladium cultivars tested. Meloidogyne javanica was isolated from caladium roots in high numbers regardless of the cultivar. Meloidogyne incognita had low numbers of second stage root-knot nematode juveniles (J₂) isolated from soil of all cultivars. The high level of reproduction of M. enterolobii and the high rate of isolation of M. javanica from roots, as well as the low rate of isolation of M. incognita from soil, are not reflected in gall ratings where M. javanica ratings were low but high numbers of eggs and J₂ 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.
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Database assignments for author(s): Nancy Kokalis-Burelle, Janete A. Brito

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Meloidogyne javanica	Caladium (crop)	U.S.A. (SE)
	Meloidogyne incognita	Caladium (crop)	U.S.A. (SE)
	Meloidogyne arenaria	Caladium (crop)	U.S.A. (SE)
	Meloidogyne enterolobii	Caladium (crop)	U.S.A. (SE)
	Meloidogyne floridensis	Caladium (crop)	U.S.A. (SE)