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In the present study hot water diffusates of different plant species (100gm /100ml) were screened for testing antibacterial activity using hole plate diffusion method against most aggressive isolates of Xanthomonas oryzae Pv.oryzae (Xoo 105). Eight plant species Citrus limon,Linum usitatissimum, Mangifera indica Phyllanthus emblica, Prunus domestica,Tamarindus indica,Terminalia arjuna and Curcuma longa exhibited maximum inhibitory action against test bacterium, among them Curcuma longa member of Zingiberaceae family showed maximum antibacterial activity , forming inhibition zone of 28.45mm in diameter, showing activity index 0.98 compared with streptomycin drug. Extract of Curcuma longa isolated from rhizome were supposed to be Curcumin
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