The cool weather is still limiting the speed of corn growth, but it won't be long before the plants begin putting leaves out quickly. That's when problems that cause leaf symptoms will first be noticed, including those caused by diseases. There are three leaf diseases that tend to appear early in the season: holcus spot, anthracnose leaf blight, and eyespot.
Iowa State University
Munkvold, Gary P. and Flynn, Paula, "Early-season leaf diseases on corn" (2002). Integrated Crop Management News. 1715.
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