Wheat in the southern part of Illinois is currently flowering to past flowering. Wheat in the central part of the state is approaching heading in many fields. With warmer temperatures forecast I expect many fields in the central part of the state to flower next week. Rains are forecast during this time as well, which may elevate risk for FHB in wheat flowering during this period. Replicated research indicates all suggested fungicides for suppressing FHB are most efficacious in suppressing vomitoxin when applied between FGS 10.5.1 through 5 days after 10.5.1. FGS 10.5.1 is defined as the point where 50% of the main tillers have started to flower in a field. Symptoms of FHB are typically most pronounced 18-24 days after flowering.

Suggested fungicide products for suppressing FHB and vomitoxin include Prosaro, Caramba, Miravis Ace, and Proline (if following with vegetables). Ensure that all label directions are being followed to ensure proper application and to ensure optimal performance. Do not apply fungicides that contain a strobilurin (FRAC group 11) as these have been associated with enhanced DON in replicated research trials. Continue to monitor your fields and the FHB prediction center as you approach the most critical times for applying in season fungicides for FHB.

-- Nathan Kleczewski Ph.D., University of Illinois, Research Assistant Professor and Extension Specialist

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