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Common Rust of Sweet Corn
Puccinia sorghi

Growth habit of Oxalis spp. (wood sorrel), a natural host for three of the five spore types of Puccinia sorghi.

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