Southern Corn RustCORN073.JPG

Southern corn rust

Area of impact: Leaves

Description: Round, light brown to orange spots scattered mainly on the upper leaf surface but may also appear on husks stalks, lower leaf surface and ear shanks.

Pathogen involved: Puccinia polysora (a fungus)

Timing/Conditions: Usually occurs just after silking during warm humid weather.

Contributing factors: Overwinters in the southern U.S. and Mexico and spores are blown north to the Corn Belt in early summer.

Management practices: Plant resistant hybrids and apply fungicide as needed.

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