Scab risk has increased significantly across much of Missouri over the past few days. In the southern half of the state, much of the wheat has already passed the flowering stage. However, later varieties in the southern part of the state and many of the varieties currently flowering in central and parts of northern Missouri are at risk for scab development. Consider applying triazole fungicide such as Prosaro, Caramba, or a generic tebuconazole if the wheat is at Feekes 10.5.1 (50% of the field is flowering) to reduce potential kernel damage and DON accumulation. In regards to varieties that may have already begun flowering within the last few days, a fungicide application up to 5 days after Feekes 10.5.1 also has been found to provide similar control. DO NOT apply a strobilurin-containing fungicide as it can result in increased DON accumulation.
For more details, go to the FHB Risk assessment tool at http://www.wheatscab.psu.edu
For the latest news and updates from the U.S. Wheat & Barley Scab Initiative, go to https://www.scabusa.org