Other fungicides available for use on field crops in Iowa are in the benzimidazoles class or are contact fungicides. Benzimidazoles are widely used fungicides that first became available in the late 1960s; however, thiophanate-methyl is the only fungicide in this class labeled for use on field crops in Iowa. Benomyl also is in this fungicide class but is no longer commercially available. Benzimidazoles are effective against a broad range of fungi that cause leaf spots, root and crown rots, stem rots, and powdery mildew--but not rusts.
Iowa State University
Mueller, Daren S., "Fungicides: Others" (2006). Integrated Crop Management News. 1296.
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