Foliar fungicides can be an important management tool in soybeans to suppress white mold. Foliar fungicides also aid in the control of foliar leaf diseases such as septoria brown spot and frogeye leaf spot. Recently liquid in-furrow fungicide applications are being used in some US states.
Many trials have been conducted in Ontario to assess the yield and seed quality benefits of foliar fungicides. Across 7 years of Ontario trials, the average yield response has been 2.3 bushels/acre to foliar fungicides. Seed size and quality can be improved especially when there is significant disease pressure.