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Common Rust of Corn
September 2011



By Dr. Snook Pataky
Professor Emeritus of Plant Pathology
University of Illinois
Phone:
217-333-6606
Email:j-pataky@illinois.edu

Part 1: Differentiating Common Rust
and Southern Rust of Corn

Watch Presentation (9 min 19 sec)

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Part 2: Common Rust of Corn
Watch Presentation (16 min 10 sec)

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Summary: Two rust diseases occur on corn grown in North America: common rust, caused by Puccinia sorghi, and southern rust, caused by Puccinia polysora. In some cases, both rusts can occur simultaneously or in the same geographic region. Because symptoms of the two diseases are similar, correct diagnosis can be difficult especially for an inexperienced observer.

This first presentation describes methods to differentiate common and southern rust in the field and in the lab. This second presentation focuses on common rust. As the name implies, common rust is the most widespread of the two rusts, particularly in the midwestern and northern regions of the North American Corn Belt. In this second presentation, the basic life cycle of Puccinia sorghi and the epidemiology of common rust are described. Factors that cause the disease to become problematic and effective methods of control also are discussed.


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