news, features, articles and disease information for the crop industry


© Iowa State University

Pathogen(s) causing disease:

Aureobasidium zeae


Northern Midwest US states, Ontario, Quebec, Europe and South America


Affected leaves are covered with numerous small round spots. Spots are ~ 1/8 inch in diameter, oval to circular and appear water-soaked. The center of the spot dies, leaving a tan colored center surrounded by a brown/purple border. This border is often circled by a yellow halo. This resembles an eye, hence the name 'eye spot'.


 Infection favored by prolonged periods of cool, wet weather. Some yield loss if severe infections occur within three to four weeks of silking


Plant resistant/partial resistant hybrids. Conventional tillage/moldboard plow (if possible) to bury corn residues. Crop rotation away from continuous corn. Foliar fungicides offer effective control.


Bloomberg, Jim. Bayer CropScience Corn Disease Identification Guide PowerPoint. 2009.
Iowa State University

Crop Disease Guide

To aid your search, we've included a photo and description along with scouting and management options. And we've also added beneficial insects by crop to help in your identification process.

Choose a Disease

By Crop:




Our Sponsors