The distribution, causal organism (Xanthomonas campestris pv. The disease is present throughout the world. The bacterium that causes black rot, Xanthomonas campestris, survives in crop residue. Black rot is most severe in wet, warm weather. The disease can cause significant yield losses when warm, humid conditions follow periods of rainy weather during early crop development. Black rot of crucifers is caused by Xanthomonas campestris pv. campestris), symptoms, inoculation, phytopathometry, epidemiology and management of this disease are reviewed. campestris. Black rot due to the use of seed infected by Xcc can be influenced by various factors such as environmental conditions (Ignatov et al. The causal agent is the bacterial pathogen Xanthomonas campestris pv. Black rot is a name used for various diseases of cultivated plants caused by fungi or bacteria, producing dark brown discoloration and decay in the leaves of fruit and vegetables: . Infecting the stem, leaf, inflorescence and roots. campestris, that can infect most crucifer crops at any growth stage. Black rot is one of the most destructive diseases of cruciferous plants worldwide. Black rot on cabbage and other crucifers This bacterial disease is common on Long Island and can be found most years, but occurs sporadically because sources of this pathogen are limited. The disease affects primarily aboveground parts of plants at any stage of growth and causes high yield and quality losses. 1999a;Kastelein et al. black rot of crucifers; Other Scientific Names. The disease affects primarily the aboveground parts of plants of any age. Black rot of crucifers is caused by Xanthomonas campestris pv. The emergence of this disease during a rather cold spring may mean that the disease started in a greenhouse situation. It affects all members of the crucifer family and often causes severe losses. 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