Cercospora zeae-maydis

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Cercospora zeae-maydis symptoms on corn leaf (click on image to enlarge it)
Author(s): Daren Mueller, Iowa State University
Source: IPM Images

Cercospora zeae-maydis Tehon & E.Y. Daniels 1925

This fungus is widely distributed in maize-growing regions and causes grey leaf spot of maize. The disease can develop into serious epidemics, resulting in yield losses of more than 50%. In North America, it became common in the 1970s and widespread outbreaks developed in 1995 with an estimated 10% of the maize crop lost in Ohio.

The symptoms consist of long rectangular grey or tan spots, typically around 3-4 x ½ cm in size. Outbreaks develop under warm and humid conditions and the fungus survives mainly in host debris.