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Southern Corn Rust


©Purdue University, Plant and Pest Diagnostic Laboratory

Pathogen(s) causing disease:

Puccinia polysora

Location:

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

Symptoms:

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.

Conditions:

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

Management:

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

Sources:

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

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