This summer in Iowa, we have seen a mixed bag of soybean diseases during our scouting, probably because of climate patterns that have differed from other seasons and because of the very different weather that has occurred in various regions across the state. In eastern Iowa, Iowa State University field agronomists reported the occurrence of white mold, sudden death syndrome, frogeye leaf spot, and top dieback. In southern Iowa, downy mildew was reported. Bacterial blight and brown spot are common across most of the state.
Iowa State University
Yang, Xiao-Bing and Robertson, Alison E., "Summer scouting in soybean: Top dieback and other diseases" (2007). Integrated Crop Management News. 1005.
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