Management of black-rot in cauliflower caused by Xanthomonas campestris pv. campestris (Pammel) Dowson

Field trials were carried out during rabi season 2010–11 and 2011–12 for the management of black rot disease in cauliflower with thirteen treatments at the Indian Institute of Horticultural Research, Hessaraghatta, Bangalore. The treatments included, seed treatment with hot water, bactericide and bioagent alone before sowing and in combination with sprays of bactericide, chemicals and bioagent in the main field. Of the different treatments tested, the combined treatment of hot water treatment of seeds at 50°C for 15 minutes followed by two applications of Streptocycline (100 ppm) + Copper oxychloride(0.3%) at fifteen days interval starting from fifteen days after transplanting recorded lowest disease incidence of 19.37 per cent and significantly highest yield of 33.3 t/ha, as compared to maximum disease incidence of 61.92 per cent and lowest yield of 15.33 t/ha in untreated control plots. Seed treatment with streptocycline (100 ppm) before sowing followed by sprays of Streptocycline (100 ppm) + Copper oxychloride (0.3%) was found to be next best by recording 20.87 per cent disease incidence and 31.00 t/ha cauliflower yield.