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Fusarium Head Blight (FHB) Risk (06/22/17)

Fields in southwestern ND are heading or near flowering, but due to the dry conditions, scab risk is very low for this area of the state.

Fusarium Head Blight (FHB) Risk

Fields in southwestern ND are heading or near flowering, but due to the dry conditions, scab risk is very low for this area of the state. The greatest amount of FHB risk for susceptible varieties that are heading/flowering is in northeastern ND. This includes the counties of Rolette, Towner, Cavalier, Bottineau, Ramsey, Benson and McHenry (Figure 1). Although the IPM survey indicates most of the fields in northeast ND are tillering to jointing, stay vigilant on small grain growth stages, use the model to help determine risk, record in-field weather factors and use a fungicide if deemed necessary. The best time to apply a fungicide in barley is at full-head and for wheat at early-flowering (Figure 2). Also, it is better to be too-late than too-early with the fungicide application. Only triazole fungicides (FRAC 3) are effective on FHB and DON/VOM and will provide the most suppression when used on a moderately resistant variety. Based on US Wheat and Barley Scab Initiative Fungicide Trials conducted in North Dakota, Prosaro and Caramba will provide 45-60% suppression, and Folicur generics (tebuconazole) provide 20-30% suppression.

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Andrew Friskop

Extension Plant Pathology, Cereal Crops

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