Environmental & other issues
Lesions; tan; red, reddish-brown, or yellow-orange borders
Description
Early in the season, anthracnose may appear on the lower leaves of the plant. Lesions can be variable in shape but are usually tan in color with red, reddish-brown, or yellow-orange borders. Lesions can coalesce and blight the entire leaf.
Photo credits
KSU Corn Production Problems