Root crops reviewed include cassava, Manihot esculenta, sweetpotato Ipomoea batatas and ginger Zingiber officinale, and tuber crops are: yam Dioscorea spp., Irish potato Solanum tuberosum and cocoyams Colocasia and Xanthosoma spp. It synthesizes major information on the crops in the field of nematology in Nigeria. The nematode problems of these crops are discussed and solutions suggested. Essentially, Scutellonema bradys and Meloidogyne spp. are identified as serious pests of yams. Pratylenchus spp. is also involved in yam damage. Meloidogyne spp; are reported as also critical in cassava culture while Pratylenchus is a threat to cassava production. Meloidogyne spp. occurs in cocoyams but have not been viewed as critical. Mainly, Meloidogyne spp. has been reported on Irish potato. Nematode reports on other crops are scarce or not available. Of the control measures discussed, emphasis is laid on use of resistant or tolerant varieties. Cultural control such as crop rotation is also advocated. Information on chemical control is discussed.