Wheat in the Eastern shore has finished flowering, except for a few late planted fields. Up in the north, wheat is anywhere from head emergence to beginning of flowering. The FHB risk for Maryland is high across the state. If your wheat is flowering (50% of the main tillers showing yellow anthers), it is advised to spray fungicides for scab. The best stage recommended for spraying fungicides is early flowering or within 4-5 days of that. The fungicides effective for FHB are Prosaro/ Caramba/ Miravis-Ace. These fungicides do not need to be tank mixed with another product for spraying. The fungicide products should be applied at the full rate recommended by the manufacturers. Strobilurin containing fungicides should not be sprayed at this stage. Aerial application at a rate of 5 gallons per acre or ground application at 15 gallons per acre with 300-350 um droplet size is recommended. Spray nozzles should be angled at 30°-45° down from horizontal, toward the grain heads, using forward- and backward mounted nozzles or nozzles with a two directional spray, such as Twinjet nozzles.
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