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Common Rust
Common rust is caused by the fungus Puccinia sorghi. Late occurring infections have limited impact on yield.
Disease development is favored by cool, moist weather.
Symptoms of common rust often appear after silking.
Small, round to elongate brown pustules form on both leaf surfaces and other above ground parts of the plant.
As the pustules mature they become brown to black.
If disease is severe, the leaves may yellow and die early.