Diseases of  Alfalfa  Corn  Soybeans  Wheat

Insect Pests of  Alfalfa  Corn  Soybeans  Wheat

Weeds  Identify  Monocots  Dicots  Grasses  Sedges  Lilies  Broadleaf

Scout Info
Kentucky IPM Pest Information Pages

Common Rust: Kentucky Corn IPM

Common Rust


The common rust fungus attacks corn leaves by producing circular to oblong golden-brown to cinnamon-brown pustules on upper and lower leaf surfaces. Rust pustules contain a thin membrane that ruptures, exposing the brightly colored spores of the fungus. About mid-season, these pustules turn brownish-black in color. Look for them on middle to upper leaves.


Common rust is caused by Puccinia sorghi. Periods of cool temperatures of 60-72 degrees F (16-23 degrees C) and high relative humidity favor development and spread of this rust species.

Common Rust

IPM Techniques

References and Additional Information

  • IPM-2 Kentucky IPM Manual for Corn

  • PPA-10a Kentucky Plant Disease Management Guide for Corn and Sorghum, P. Vincelli and D.E. Hershman, Extension Plant Pathology, University of Kentucky
  • Compendium of Corn Diseases.M.C. Shurtleff. The Amer. Phytopathol. Soc. 1980.

This site was created and is maintained by Pat Dillon, Department of Entomology, University of Kentucky, S-225 Agricultural Science Ctr North, Lexington, KY USA  40546-0091 (phone: 859/257-3571). Please send questions or suggestions to: pdillon@uky.edu