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Early Blight Alternaria â Treatment For Tomato Plant Leaf Spots And Yellow Leaves. If you have noticed tomato leaf spots and the lower leaves turning yellow, you may have tomato early blight alternaria. This tomato disease causes damage to the leaves, stems and even the fruit of the plant. Keep reading to learn more about what causes tomato early blight alternaria and how to treat leaf spot.
Tomato blight, in its different forms, is a disease that attacks a plantâs foliage, stems, and even fruit. Early blight (one form of tomato blight) is caused by a fungus, Alternaria solani, which over-winters in the soil and infected plants. Affected plants underproduce. Leaves may drop, leaving fruit open to sunscald. Early blightâs Latin name is sometimes confused with a form of tomato rot, alternaria, a different tomato problem altogether.