
Citrus canker is the most serious bacterial disease caused by bacterium Xanthomonas axonopodis pv. citri. In the present investigation the effect of crude methanolic, ethanolic and aqueous extracts of ginger rhizomes, curry leaves, neem, tulsi and parthenium leaves on in vitro growth of plant pathogen Xac causing citrus canker were tested. Different concentrations (25%, 50%, 75% and 100%) of these extracts were prepared. Among them all extracts of neem were found effective in inhibition of the growth of the test pathogen and its effect gradually increased with concentration. The methanolic extract of neem at 100% conc. given highest inhibition zone i.e. 14.0 mm followed by that of parthenium (10.6 mm) and tulsi (9.6 mm) extracts.