Corn is vulnerable to the following infections by plant pathogens throughout the growing season under favorable environmental conditions: seed rots and seedling blights soon after planting, foliar diseases in mid-season, and stalk and ear rots toward the end of the growing season. Many of these diseases are caused by pathogens that survive in crop residue or in the soil. Thus, the risk of increased disease severity is higher when corn follows corn. However, do not forget the disease triangle (below). Weather conditions during the growing season will still significantly impact disease severity.
Iowa State University
Robertson, Alison E. and Munkvold, Gary P., "Potential disease problems in corn following corn" (2007). Integrated Crop Management News. 1166.
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