Eastern Iowa has received more rain than western Iowa, and some foliar diseases, such as bacterial leaf spot and brown spot, are developing in eastern Iowa soybean fields. A disease relatively new to Iowa is Phyllosticta leaf spot, caused by Phyllosticta sojicola. Limited information is available on Phyllosticta leaf spot; most reports are from southern states. It is considered a minor disease throughout soybean production areas in the United States. A certified crop adviser detected this disease in Muscatine County, and his finding was confirmed by the Iowa State University Plant Disease Clinic. This disease also was found in several fields in Jefferson County.
Iowa State University
Yang, X. B., "Phyllosticta leaf spot on soybean" (2002). Integrated Crop Management News. 1812.
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