FHB Update from TN, 04/26/18

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.

Only fungicide products that are solo triazoles (FRAC or fungicide group 3 on the label) should be applied for prevention/management of Head Scab. Products that contain a strobilurin can increase the mycotoxin levels in FHB infected wheat. The best products currently available for reducing Scab symptoms and DON levels are Caramba and Prosaro. A more comprehension fungicide table can be found at UTcrops.com (Wheat fungicide Table).

--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