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Southern rust (Puccinia polysora) is found in late summer in some years during periods of moderate-to-warm temperatures and high humidity/rainfall. Numerous pustules can be found on upper leaf surfaces, while sporulation on lower surfaces is fairly sparse. Pustules range in color from yellow-orange to cinnamon brown. Leaves tend to turn yellow and later necrotic as the disease progresses; other plant parts may also be affected.

Southern rust.

(Photo: Kenneth Cropper, University of Kentucky)

Management: 

• Resistant varieties and fungicides (on later plantings if disease is seen on early plantings or if disease is observed at the whorl stage).

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