What causes early blight on tomato leaves

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Leaf spot symptoms of early blight on tomato. Early blight can be caused by two different closely related fungi, Alternaria tomatophila and Alternaria solani. Common on tomato and potato plants, early blight is caused by the fungus Alternaria solani and occurs throughout the United States. Symptoms first appear on. Early blight can affect seedlings but is generally observed on older plants and is on the lower, more mature leaves is one of the first symptoms of infection.

Early blight of tomato is caused primarily by the fungus Alternaria linariae (=A. tomatophila; The leaves, fruit, and stem may be affected by Alternaria linariae. 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. Early blight is a common tomato disease caused by the fungus Alternaria solani. It can affect almost all parts of the tomato plants, including the.

Symptoms. Symptoms of early blight occur on fruit, stem and foliage of tomatoes and stem, foliage and tubers of potatoes. Initial symptoms on leaves appear as. Although it's called “early blight,” it can actually occur any time during the growing season attacking the leaves, stems and fruit. It can also cause disease on its. SYMPTOMS AND DIAGNOSTICS. The fungus can infect most parts of a tomato plant, including leaves, stems, and fruit. Lesions on leaves first appear as small ( .