The widespread rain that has occurred across Iowa has been favorable for the development of early season disease in both corn and soybean. In corn, symptoms of anthracnose leaf blight (Figure 1) are common in corn-following corn fields. A very low prevalence of eyespot and common rust have also been seen in ISU fungicide trials. In soybean, brown spot (Figure 2) and bacterial blight (Figure 3) symptoms are becoming common.
Iowa State University
Robertson, Alison E., "Early Season Diseases Showing Up in Corn and Soybean Fields" (2010). Integrated Crop Management News. 417.
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