There have been several recent reports of leaf spots showing up on corn in addition to the eyespot and Goss’s wilt reported earlier this growing season. Some of these are expected – Northern corn leaf blight and gray leaf spot, but some such as southern rust are a little less common, and others are just weird.
Iowa State University
Robertson, Alison E.; Jesse, Laura C.H.; and Iriarte, Fanny, "Common, Weird and Unusual Spots Showing up on Corn" (2010). Integrated Crop Management News. 388.
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