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Abstract
Crude extracts and active principles from medicinal plants have shown potential role in controlling plant diseases in glasshouses as well as in fields as one of the safest and eeofriendly methods. The effect of nor-seeurinine (an alkaloid) isolated from Phyllanthus amarus has been seen against spore germination of some fungi (Alternaría brassicae, A soiani, Curvularia pennisetti, Curvularia sp., Erysiphe pisi, Helminthosporium frumentacei) as well as pea powdery mildew (Erysiphe pisi) under glasshouse conditions. The sensitivity of fungi to nor-seeurinine varied considerably. Nor-seeurinine was effective against most of the fungi. H. frumentacei was more sensitive even at the lowest concentration ( 1,000 μg/ml). Likewise conidia of E, pisi were also inhibited in partially or completely appressorium formation. Pre-inoeulation treatment showed greater efficacy than post-inoculation in inhibiting powdery mildew development on pea plants in a glasshouse. Maximum inhibition occurred at 2000 μg/ml.