Nematodes Associated with the Edible Aroid Genera Xanthosoma and Colocasia and Their Effects on Yield


  • R. McSorley
  • S. K. O'Hair
  • J. L. Parrado


Cocoyam, Taro, Meloidogyne incognita, Meloidogyne javanica, Rotylenchus reniformis, Hirschmanniella, Tannia, Dasheen, Eddoe


The plant-parasitic nematodes associated with various aroid species are reviewed. Species of Meloidogyne, particularly M. incognita (Kofoid & White) Chitwood and M. javanica (Treub) Chitwood, are the most widely reported nematode pests of both Colocasia and Xanthosoma but the severity of crop damage varies widely, depending on plant cultivar, growing conditions, nematode population, and geographical location. Rotylenchulus reniformis Linford & Oliveira is also widely reported on the aroids, and low initial populations built up to high levels on Xanthosoma caracu Koch et Bouche, X. atrovirens Koch et Bouche, X. violaceum Schott, and Colocasia esculenta (L.) Schott in field tests in Florida. With preplant populations of 56 R. reniformis/100cm of soil and final populations of about 400/100cm of soil, a significant (P = 0.05) reduction of 26% in marketable dry cormel weight of X. caracu occurred in nontreated plots when compared to fumigated plots, but yield of X. atrovirens was not affe