This is Alternaria leaf spot, a fungus (Alternaria spp.) favored by cool, rainy weather. Alternaria can infect cauliflower, Brussel sprouts and broccoli crops. It is spread by splashing water and can be controlled with fungicidal sprays. Contact your local Extension office for current chemical recommendations. For more general information on this disease (Cole Crops Alternaria Leafspot) or other garden pests (Garden, Lawn, and Landscape Pests: Diseases) click on the high lighted links.
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What is causing circular black spots about the size of a penny or larger on my maturing cabbage heads?
Last Updated: September 27, 2011
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