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Wheat Disease Update: Fusarium Head Blight Risk (07/02/20)

According to the National Fusarium Risk model, risk continues to remain high for susceptible varieties that are flowering in Eastern ND and for an area in northwest North Dakota (Figure 1).

According to the National Fusarium Risk model, risk continues to remain high for susceptible varieties that are flowering in Eastern ND and for an area in northwest North Dakota (Figure 1). For moderately susceptible varieties, risk is low for most of the state (Figure 2). Currently, the National model and NDSU model differ in scab risk projections and I would suggest that the NDSU model is too conservative in the assessment of FHB risk. Recent rain events and higher nighttime humidity will likely increase FHB risk on susceptible varieties for several areas in the state. Continue to monitor the growth stage in small grain fields to determine the best time to apply a fungicide (if warranted). The best time to apply a fungicide in wheat is at early flowering and up to seven days after the start of flowering (Figure 3). In barley, the best time to apply is at full-head and up to seven days after full-head (Figure 4).

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Andrew Friskop

Extension Plant Pathology, Cereal Crops

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