Wheat is beginning to flower in the northcentral and thumb regions of Michigan, though some of the October- seeded crop is still a week away. Growers are encouraged to watch this risk map and consider using a fungicide to protect susceptible varieties. Also consider any leaf diseases that might pose a threat to the flag leaf in the weeks to come. Because flooding is preventing ground application in some areas, aerial application may be a reasonable alternative. Although there are few studies on applying fungicides to wheat by air, it is worth looking at the Extension bulletin called "Aerial Application of Fungicide for the Suppression of Fusarium Head Blight". This piece has a few suggestions for obtaining good coverage of the wheat heads including the use of: 1) a minimum of 5 gallons/acre of water; 2) a “large fine” to “fine medium” spray droplet; 3) a minimum pressure of 30 psi and 4) an application altitude of 8 to 12 feet depending or the aircraft.
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