Evaluation of different toxicants against Xanthomonas campestrispv. citri (Hasse) dows

Toxicants (Streptomycin sulphate Dithane M-45, Agrimycin – 100, Vitavax, Benlate and Cobox) were tested at 1% concentration against multiplication of Xanthomonas campestris pv. citri in vitro. Agrimycin –100, Streptomycin sulphate, Vitavax, and Dithane M – 45 proved more effective as compared to other toxicants. Agrimycin –100, Streptomycin sulphate DithaneM-45 and Vitavax were further studied in vitro against the growth of Xanthomonas campestris pv. citri at 0.01 , 0.1 and 1% concentration. All the toxicants inhibited the multiplication of the bacterium at all concentrations, however Streptomycin sulphate was found to be the most effective among the toxicants used while Agrimycin –100, Vitavax and Dithane M –45, in the order, were effective against the multiplication of bacterium at 0.01, 0.1 and 1% concentration. The inhibition zone recorded in the toxicants was increased. Streptomycin sulphate, Agrimycin – 100, Vitavax, Dithane M –45 and Benlate at 0.2% concentration were sprayed on the field grown citrus plants and then inoculated with Xanthomonas campestris pv. citri for control of citrus canker disease. Streptomycin sulphate, Vitavax, Dithane M –45 and Agrimycin –100 in the order proved effective also in reducing the disease intensity as compared to inoculated control.