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Infected leaves in the lower canopy showing browning and curling. Photo courtesy of Robert Blanchette.
Necrotic (brown) spotting of the leaves may signal a mild infection or a late season infection, since older, mature foliage is more resistant. Photo courtesy of University of Minnesota Plant Disease Clinic.
Early season or severe infections may cause necrosis (browning), spotting, and curling of the leaves.
Photo courtesy of University of Minnesota Plant Disease Clinic.
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