The reaction of tomato cv. Roma vf (Solanum lycopersicum) to Meloidogyne javanica Treub infestation in an ultisol treated with aqueous leaf extracts of bitter leaf (Vernonia amygdalina L.) and mango (Mangifera indica L.) was investigated in the Federal College of Agriculture Ishiagu, Ebonyi State, SE Nigeria. Two pot experiments were performed in 2008 and 2009. The various leaf extracts were used at three concentrations of 150 g/l, 300 g/l, and 450 g/l. The soil of the site was characterised as ultisol. Soil without the extracts served as the control. The experiment was set up in a Completely randomized design with four replications. Data obtained were averaged for the two experiments and subjected to the statistical analysis of variance using Genstat Edition 3 Release 7.2. Obtained data concerned plant height (cm), number of leaves at 50% anthesis, number of fruit and fruit weight (g) at harvest, number of galled roots and gall index at harvest. Results showed that the two leaf extracts had highly significant (p < 0.01) effects on all the data. The extracts showed a high nemato-toxic effect on the nematode by reducing the number of galled roots and gall index as well as increasing the fruit weight at the application of water extracts of bitter leaf and mango leaf at the concentration of 450 g/l. This dose gave the highest fruit weight and could be recommended to farmers.
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