| Septoria leaf spot on tomato leaves. Usually appears on older leaves after first fruit set. Lesions can also appear on stems, petioles or the calyx of fruit. The lesions are circular with dark brown margins and tan to gray centers dotted with black pycndia. A narrow yellow halo is often asociated with leaf lesions.
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 | Leaves on Left or Right with Septoria lesions compared to leaf in center with Early Blight lesions. Note that the Early Blight lesions have a brown color with concentric circles. The Septoria lesions have a light tan color with black halos around the lesions. In the center of the tan areas, black spot or bumps can be found which are the pycindia or fruiting body containg the spores.
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| Microscopic cross section of tomato leaf showing pycnidia fruiting body with condia. | 
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