When these protracted cool, humid conditions exist, susceptible corn hybrids and sweet corn varieties can become seriously affected. Although rust is frequently seen on corn in Ohio, very rarely has there been need for control on field corn. In field corn, highly resistant hybrids are available and most hybrids possess some degree of resistance. Pop and sweet corn can be quite susceptible. In seasons where considerable rust is present on the lower leaves prior to silking and the weather forecast is for unseasonably cool, wet weather, chemical control may be necessary.
Fungicides are available for rust control.
Consult label recommendations for rates and application timing. Early application is necessary for effective disease control. All educational programs conducted by Ohio State University Extension are available to clientele on a nondiscriminatory basis without regard to race, color, creed, religion, sexual orientation, national origin, gender, age, disability or Vietnam-era veteran status. Keith L. Smith, Associate Vice President for Ag. Adm. and Director, OSU Extension.