The aqueous extracts of 50 plants were screened using agar diffusion for antibacterial activity against Xanthomonas campestris pv. campestris, a causal organism of black rot of cabbage (Brassica oleracea var. capitata) and cauliflower (Brassica oleracea var. botrytis). The combined leaf extracts of Cannabis sativa and leaf extracts of Dalbergia sisoo in general exhibited strong antibacterial activity over individual extracts of leaf extracts of Cannabis sativa and Dalbergia sisoo against the bacterium's growth, respectively. Seed extract of Acacia arabicae and leaf extracts of Dedonia viscosa were next most effective against Xanthomonas campestris pv. campestris. A few plant extracts also showed moderate activity against the test bacteria. Provide a summary statement indicating the importance of the work. The research work indicates that the use of plant extracts as antimicrobial agent to control plant pathogens is feasible and is cost effective as the material used is inexpensive. The major benefit is its being eco-friendly.