Beginning in the mid-2000s the use of foliar fungicides in field crops such as corn and soybean has increased dramatically. In 2007, approximately 20% of the corn grown in the Midwest was sprayed with a foliar fungicide (Munkvold et al., 2008), and this percentage has remained steady with perhaps some slight increase. In some cases, fungicides are applied solely for hopes of a yield benefit with no regard to disease risk (Bradley and Ames, 2010). With high commodity prices, this non-IPM use of foliar fungicides may increase, which increases the risk of fungicide resistance.
Soil Science Extension
University of Wisconsin Madison