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<p>The antifungal activity of aqueous and ethanol extracts obtained from seed and leaf of <em>Jatropha curcas </em>were investigated using agar incorporation method <em>in vitro </em>against <em>Aspergillus niger</em>, a microbe known to be resistant to some chemical agents. Pathogenicity test revealed that <em>A. niger </em>was the pathogenic fungus that cause black mould rot of onion bulbs. The growth of <em>A. niger </em>was markedly suppressed by aqueous and ethanol extracts of leaf and seed, 65.7 and 57.0% at 160 mg/ml. The extracts at low concentration did not show considerable activity against the fungus except leaf ethanol extract 53.3% at 40 mg/ml.The <em>in vivo </em>study showed that aqueous extracts of seed and leaf reduced rot development, 59.4 and 54.4 % in onion bulbs. Highest rot inhibition 66.3 was obtained at 160 mg/ml seed extract.The result of the study suggest the potentials of <em>J</em>. <em>curcas </em>extracts as fungicidal agent that could be useful in management of black mould rot of onion bulbs caused by <em>Aspergillus niger</em>.</p> <p>International Journal of Environment, Volume-2, Issue-1, Sep-Nov 2013, Pages 83-90</p> <p>DOI: <a href="http://dx.doi.org/10.3126/ije.v2i1.9211">http://dx.doi.org/10.3126/ije.v2i1.9211</a></p>