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Vol. 22, No. 13, July 13, 2007

Scouting for Diseases: Septoria leaf spot Jan Byrne MSU Diagnostic Services


Microscopic view of pycnidia on leaf surface. Spores are released through the central opening in these volcanolike structures.

Septoria pycnidia are visible in lesions.	Lesions on Heuchera.

Purple leaf lesions caused by Septoria rudbeckiae. Rudbeckia and Ratibida are the only hosts of this particular species of Septoria. At right, a closer look at severe purpling on rudbeckia foliage.

The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the Michigan Agricultural Experiment Station, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.
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