Biological control of black rot (Xanthomonas campestris pv. campestris) of cabbage in Tanzania with Bacillus strains

We evaluated the biocontrol efficacy of strains of Bacillus from Tanzania against the black rot pathogen, Xanthomonas campestris pv. campestris, in cabbage and the influence of the method of application under field conditions. The incidence and severity of black rot in the foliage, stems and heads of the highly susceptible cultivar, Copenhagen Market, were significantly reduced, especially when antagonists were applied through the roots as compared to application through the seeds or foliage (cotyledons). Promising antagonists included strains of B. cereus, B. lentimorbus and B. pumilus.