Pythium Damping-Off - This disease commonly affects seeds and young transplants and is caused by the soil-borne fungus. Downy Mildew - This disease is caused by the fungus Peronospora parasitica and can attack both seedlings and mature vegetable plants. Alternaria Leaf Spot - This disease is caused by the fungus, Alternaria species, and occurs during warm, moist conditions. Black Rot - Black rot is caused by a bacterium, Xanthomonas campestris pathovar campestris, and can affect all vegetables in the crucifer family. Black Leg - The fungus, Phoma lingam, causes black leg. Wirestem - The fungus, Rhizoctonia solani, causes wirestem. Fusarium Yellows - Yellows or wilt is a much less important disease today due to the development of varieties resistant to the disease. Viruses - There are several common viruses that can affect cole crops including Turnip mosaic virus and Kohlrabi mosaic virus.. |