Weed and crop hosts of root-knot nematode, Meloidogyne javanica (Treub, 1885) Chitwood, 1949 in North West Nigeria.
The weed species Ageratum conyzoides, Eclipta alba, Ipomoea aquatica, Polygonum senegalense and Sesbania leptocarpa were hosts of Meloidogyne javanica in the fadama farmlands along the Rima river in Sokoto, Nigeria. All the vegetable crops grown in the local environment were infected by the nematode. Wheat was attacked both in the field and under screen house conditions. Rice, millet and sorghum were not attacked by the nematode under screen house conditions. Cowpea cultivars Ife Brown, Kano 1996, TVX 3236 and IAR 335 were attacked by M. javanica. All of the 4 cultivars had significant reductions in the number of nodules. Symptoms of infection included yellowing of leaves and heavy galling of the roots.