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This vegetable disease factsheet discusses collar rot and Alternaria stem canker of tomato, which are caused by different species of fungi belonging to the genus Alternaria. Both pathogens can cause large, irregularly shaped stem lesions with pronounced concentric rings. However, the concentric rings may not always be pronounced with collar rot.
This vegetable disease fact sheet discusses three foliar fungal diseases (Botrytis gray mold, leaf mold, and powdery mildew) of high tunnel and greenhouse tomatoes.
