Septoria leaf spot

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Septoria leaf spot - Septoria ampelina Annemiek Schilder, MSU Plant Pathology
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Septoria leaf spot, also called mélanose, is a minor foliage disease in the eastern and midwestern United States. The disease mainly affects American Vitis and muscadine grapes. Angular, reddish brown to black spots that are 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.
Additional information Search MSU Fruit CAT Alert newsletter for articles. MSU Diagnostic Services Special grape disease problems and controls (from Michigan Fruit Management Guide)

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Funding for this web site provided by Project GREEEN, American Farmland Trust, EPA Region 5's Strategic Agricultural Initiative program, The National Foundation for IPM Education, the Center for Agricultural Partnerships and the MSU Integrated Pest Management Program
in collaboration with MSU Extension and the Michigan Agricultural Experiment Station.
Updated 11/30/07 Contact: J.N. Landis.