The aim of the present study was to check the antimicrobial potential of eleven different aqueous leaf extracts on <i>Xanthomonas campestris</i>, <i>Agrobacterium rhizogenes</i> and <i>Aspergillus fumigatus</i> based on formation of the zone of inhibition (ZOI). <i>Prosopis juliflora</i> showed maximum and significant inhibitory effect on the growth of all the three pathogens. In case of <i>Xanthomonas campestris</i> the effect of this plant extract was almost equal to the strength of Streptomycin 10 mcg, (the metric system uses the term mcg to represent micrograms). Aqueous extracts of some plants formed low zone of inhibition. While some plant extracts were comparatively more effective against all the three pathogens (<i>Xanthomonas campestris</i>, <i>Agrobacterium rhizogenes</i> and <i>Aspergillus fumigatus</i>)

A prelimenary study was carried out to evaluate the potential of cultivating Hyoscyamus muticus L. as a source of hyoscyamine. The alkaloid yield was found to be quite favorable for the commercial utilization of this plant.

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Aqueous extracts of 35 medicinal plants from different families were tested for their antimicrobial potential against six important phytopathogenic micro-organisms viz. Pseudomonas syringae, Xanthonomonas axonopodis, Rhizoctonia solani, Aspergillus flavus, Aspergillus fumigatus and Aspergillus nidulans, causing considerable yield loss. Among the 35 plants tested, aqueous extracts of 16 plants have recorded significant antibacterial and antifungal potential against one or the other species tested. Findings of the present study conclude that the antimicrobials of plant origin are responsible for significant reduction in bacterial and fungal pathogens, and thus, they prove to be good sources of bioactive compounds. However, further experiments are currently in progress to isolate and purify active antimicrobials.

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