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Corn Eyespot

July 2016

By Damon Smith, Ph.D.
Assistant Professor
Extension Specialist
Department of Plant Pathology
University of Wisconsin-Madison

Watch Presentation (12 min 54 sec)

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Summary: Eyespot of field corn and sweet corn is caused by the fungus Aureobasidium zeae. Eyespot is problem on corn when temperatures are cool (68-70 F) and there are frequent rains or dew events. Other conditions that favor eyespot include minimal tillage, continuous corn rotation, and susceptible hybrids. Most modern corn hybrids are resistant to eyespot. Therefore, yield loss is very minimal on most hybrids. However, on susceptible hybrids yield loss averages about 9%. This presentation will highlight information about eyespot and how to manage eyespot of field corn and sweet corn.

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