Over the past week I have received emails, phone calls and samples of two leaf spots that occur in Iowa from time to time, Holcus leaf spot and Physoderma brown spot. Holcus leaf spot is caused by the bacterium Pseudomonas syringae. Symptoms are light tan (sometimes almost white), round to oval spots, which may appear water soaked at the margins or have a light brown border occur on the lower leaves (Figure 1 and 2).
Iowa State University
Robertson, Alison E., "Unusual Foliar Diseases Showing up in Iowa Corn" (2008). Integrated Crop Management News. 794.
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