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Common Rust of Sweet Corn
Puccinia sorghi

The aecial stage ("cluster-cups') appears on the underneath surface of Oxalis leaves, giving rise to aeciospores, which infect corn grown in Mexico.

Photo courtesy of H.R. Dillard, NYAES, Geneva, 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