Septoria leaf spot

Disease

Septoria leaf spot

Septoria ampelina

Distribution: Septoria leaf spot is a minor foliage disease in the eastern and midwestern United States.

Photos

Leaf lesions.

Septoria leaf spot, also called méelanose, mainly affects American Vitis and muscadine grapes. Angular, reddish brown to black spots 1 to 2 mm in diameter appear after midseason. Nearing veraison, lesions become larger with diffuse margins. Fruiting bodies may be seen with a hand lens. The area surrounding the spots may be yellow. The fungus overwinters in infected leaf debris.

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