When soybeans start to emerge, a few of us may experience stand reductions caused by seedling diseases. Several fungi can cause stand establishment problems either before or after soybean emergence. Pythium, Phytophthora, Rhizoctonia, and Fusarium are fungi that cause seedling blight in Iowa. Research shows that the first three fungi account for about 90 percent of disease-related stand reduction problems in Iowa. Fusarium is a minor problem. Determining which fungi are the cause of a problem in a particular field is a main task of scouting.
Iowa State University
Yang, X. B., "Scouting for soybean seedling diseases" (1998). Integrated Crop Management News. 2295.
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