In general, the foliar, stem, and root diseases of soybean are important components of yield loss in Iowa soybean fields. Except for seed production, prior to 2005 foliar diseases were not of a major concern to soybean production in Iowa and much of the north central region states of the United States. Since the report of Asian soybean rust in South America in 2001 and then in the United States in 2004, attention on fungicide applications in soybean production has increased.