CABBAGE, BROCCOLI & OTHER COLE CROP DISEASES Factsheet | HGIC 2202 | Updated: Nov 11, 2019 | Print | Download (PDF) Black rot ( Xanthomonas campestris pathovar campestris ) symptoms are yellow, V-shaped lesions that appear along the tips of the leaves with the point of the V directed toward a vein. Mary Katherine Bamberg, ©2018, Clemson Extension Cole crops, such as broccoli, Brussels sprouts, cabbage and cauliflower, are easily grown in South Carolina. Tips for growing healthy cole crops in the garden are available in HGIC 1301, Broccoli , HGIC 1326, Cauliflower and HGIC 1303, Cabbage & Chinese Cabbage . Several disease problems commonly affect these plants, especially when resistant varieties are not planted. Some of the more common problems are covered here, including root and stem rots of young plants, black rot, downy mildew and viruses. Pythium Damp...