The impact of root leachates of Lantana camara L., a tropical weed, against Meloidogyne javanica, the
root-knot nematode, was tested under laboratory and pot conditions. Concentrated and diluted root leachate caused
substantial mortality of M. javanica juveniles. Significant suppression of the nematode was achieved when soil was
treated with a full-strength concentration of the leachate. Whilst this high concentration retarded plant height and
shoot fresh weight, more diluted concentrations actually enhanced plant growth. To establish whether this inhibition
of plant growth from the leachate was the result of depleted nitrogen levels in the soil due to the leachate, soil treated
with such leachates was given urea as an additional nitrogen source. Urea not only enhanced nematode suppression
activity of the root leachates but also increased seedling emergence and growth of mungbean. Application of the L.
camara root leachates in combination with Pseudomonas aeruginosa, a plant growth-promoting rhizobacterium,
significantly reduced nematode population densities in roots and subsequent root-knot infection, and enhanced plant
growth. While a high concentration of root leachate slightly reduced P. aeruginosa colonization in the rhizosphere
and inner root tissues, the nematicidal efficacy of the bacterium was unaffected. The root leachate of L. camara was
found to contain phenolic compounds, including p-hydroxybenzoic acid, vanillic acid, caffeic acid, ferulic acid and a
quercetin glycoside, 7-glucoside. It also contained weak enzymic hydrogen cyanide