Five fresh and uniform size egg-masses or 100 infective juveniles of the root-knot nematode, Meloidogyne incognita were separately exposed to aqueous leaf extracts of jojoba (Simmondsia chinensis), moringa (Moringa oleifera) and water hyacinth (Eichhornia crassipes ) at three concentrations (S, S/2 and S/4). Results showed that egg hatching and juvenile mortality were obviously influenced by plant species,concentration and exposure time. All the tested extracts significantly (P ≤0.05) inhibited egg hatching and increased juvenile mortality in vitro. Undiluted leaf extracts of jojoba and moringa gave the highest inhibition of egg hatching (89.1 and 87.9%) and juvenile mortality (89.8 and 84.1%) after 6 and 7 days of exposure, respectively. However, water hyacinth showed a relatively lower effect on egg hatching and juvenile mortality. Incorporation of leaf powder of jojoba, moringa and water hyacinth at rate of 10g/plant under greenhouse conditions, significantly (P ≤0.05) suppressed galling and reproduction of M. incognita and enhanced plant growth of Luffa aegyptiaca as indicated by length and fresh weight of shoots. Jojoba and moringa (after oxamyl) gave the best results.