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Southern Corn Rust

©Purdue University, Plant and Pest Diagnostic Laboratory

Pathogen(s) causing disease:

Puccinia polysora


Common to many countries of the world, including Africa, Southwest Asia, South and Central America and the south/central US.


Similar to common rust except pustules occur almost exclusively on the upper leaf surface, rarely on lower. Pustules are more cinnamon to orange than brick-red and slower to break through epidermis of leaf than common rust pustules. Southern rust pustules appear to be smaller in size than common rust pustules.


Favored by warmer temperatures (80-90 degrees F) and high humidity (95 per cent). 


Resistant hybrids. Foliar fungicides may be useful in seed production fields.


Purdue University
University of Illinois
Bloomberg, Jim. Bayer CropScience Corn Disease Identification Guide PowerPoint. 2009.

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