Iowa isn't a state where we see a lot of foliar pathogens. Every year we see foliar pathogens in soybeans; however, many of these diseases typically have minimal or uneconomic impacts on yield. For that reason, use of foliar fungicides hasnt been necessary in Iowa. The recent discovery of Asian soybean rust, a potential threat to soybean producers in the United States, has increased the interest of using foliar fungicides as a preventive control method for managing Asian soybean rust.
Iowa State University
Pedersen, Palle, "Use of strobilurins in Iowa" (2007). Integrated Crop Management News. 1196.
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