With most corn in Iowa at the V7-V12 range, it’s important to be aware of potential corn diseases at this particular time. Given the wet growing conditions over the last month, corn in parts of Iowa will be very susceptible to Physoderma brown spot and node rot, caused by the fungus Physoderma maydis, and gray leaf spot, caused by the fungus Cercospora zeae-maydis.
Iowa State University
Stoetzer, Ethan and Robertson, Alison E., "Weather Conditions Ripe for Physoderma Brown Spot and Node Rot and Gray Leaf Spot" (2018). Integrated Crop Management News. 2488.
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