The wet weather in Tennessee are conducive for spore production. If wet and moderately warm temperatures continue into flowering, wheat will be at increased risk for FHB infection and fungicide application would be recommended. Best fungicide timing is at initial bloom/flowering (Feekes 10.5.1), which relates to at least 50% of the heads blooming in a field. Although applications made 5 to 6 days after initial bloom can also provide a benefit in reducing FHB and mycotoxin levels.
--Heather Young-Kelly, Extension Plant Pathologist, University of Tennessee
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