The purpose of this study is to evaluate the use of different fungicides, applied at the Feekes 8 growth stage, and their effects on yield and profitability.

Fungicide use on wheat is most common at flowering (Feekes 10.5) to control Fusarium Head Blight (head scab). However, with a recent increase in popularity of more intensively managed acres, many farmers are applying an earlier fungicide application at flag leaf (Feekes 8 to 9) to suppress foliar leaf diseases. The flag leaf is significant because it’s responsible for the vast majority (over 75 percent) of the photosynthate during grain fill. Therefore, keeping it healthy, especially in those high yield environments, is crucial for maximum production. Small amounts of both stripe rust and powdery mildew were observed in this study, but differences in severity were not distinguishable between treatments. Nexicor™ was the only fungicide which provided a yield increase (+2 Bu./A.), but it was not significant enough to offset the cost of the application.

2021 Iowa Organic Soybean Fungicide & Insecticide Study - In-Furrow

2021 Iowa Soybean FUNGICIDE STUDY CARRIER RATE

Fungicide Study

2018 Indiana Wheat Fungicide Study

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