Across Iowa many farmers and agronomists are starting to ask if or when to apply fungicide on corn and soybeans. Like the past few years, there have been very little early season foliar problems on both crops. In soybean, frogeye leaf spot, Cercospora leaf blight, and brown spot have been reported on seedlings. Brown spot is really the only foliar disease still being reported, although soybeans usually grow out of any early season infection. Likewise in corn, very few foliar diseases have been found prior to tasseling.
Iowa State University
Mueller, Daren S. and Robertson, Alison E., "New Fungicide Questions Creeping into the Conversation" (2012). Integrated Crop Management News. 215.
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