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Fusarium Head Blight (FHB) Risk and Resources (06/25/20)

Over the past week, there have been several reports of wheat and barley heading across the state and now is the time to start monitoring scab risk.

Over the past week, there have been several reports of wheat and barley heading across the state and now is the time to start monitoring scab risk. Most areas of the state with a heading small grain crop are under low scab risk, however there are a few pockets with higher risk. According to the National Fusarium Risk Tool, risk is moderate to high for susceptible varieties in the eastern quarter of the state and for a small pocket in northwestern ND (Figure 1). Scab risk for moderately susceptible (score of 5-6 in the selection guide) and moderately resistant (score of 4 in the selection guide) varieties is low across the state (Figure 2). As a reminder, the best time to apply a fungicide for FHB in wheat is at early flowering, and the best time in barley is at complete head emergence. Recent research conducted by NDSU has shown a fungicide application is still effective in reducing FHB and deoxynivalenol (DON/VOM) if applied up to 7 days after early-flowering has started in wheat or up to 7-days after full head emergence in barley. The most effective fungicides for FHB are Caramba, Miravis Ace and Prosaro and provide 50-60% suppression, whereas generic formulations of Folicur (tebuconazole) provide 25-30% suppression.

For more information on FHB, please review the information found in the NDSU Extension publication Fusarium Head Blight (Scab) of Small Grains (PP804) and the Crop Protection Network publication Optimizing Fungicide Use for Fusarium Head Blight (Scab) and Associated Mycotoxins. Recently, the United Wheat and Barley Scab Initiative funded videos on FHB and can be viewed on YouTube titled Fusarium Head Blight (FHB) of Wheat and Barley, Management Recommendations and Management of FUSARIUM HEAD BLIGHT IN WHEAT (North Dakota State University). These videos have great information on FHB management and other commonly asked questions.

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Andrew Friskop

Extension Plant Pathology, Cereal Crops

This site is supported in part by the Crop Protection and Pest Management Program [grant no. 2017-70006-27144/accession 1013592] from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed are those of the website author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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