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Common Rust of Sweet Corn
Puccinia sorghi

Partial resistance expressed as chlorotic or necrotic hypersensitive flecks with little or no sporulation, illustrated here on the lower leaf surface.

Photo courtesy of T.A. Zitter, Cornell University, Ithaca, NY

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Link to the Factsheet on Common Rust of Sweet Corn

Link to Photo Gallery of Common Rust of Sweet Corn