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 (see also Cercospora zeina which causes another form of this disease). 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.