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Tomato - Septoria Leaf Spot
This article was published originally on 8/11/2000
At this time of year, symptoms of Septoria leaf spot are quite evident on tomato leaves. This disease usually appears on lower mature leaves, causing them to turn yellow then brown and wither. Diseased leaves show small circular spots (lesions) with black or brown margins. The center of these lesions eventually turns gray, with small black fungal fruiting structures (pycnidia) scattered throughout. Lesions may also occur on stems and petioles, but tend to be more elongated.
Septoria leaf spot is caused by the fungus Septoria lycopersici. High relative humidity and temperatures between 68-77 F are favorable conditions for infection and development of this disease.
Listed below are measures that can help control the disease:
Year of Publication:
IC-483(20) -- August 11, 2000