Some winter malting barley in New York is beginning to emerge from the boot and this is a critical time to consider a fungicide application. The Fusarium Risk Assessment Map (http://www.wheatscab.psu.edu/riskTool.html) indicates a moderate to high risk of Fusarium head blight (FHB) for several areas of New York. Maximal suppression of FHB and grain contamination by deoxynivalenol (DON) mycotoxin results when fully emerged heads of winter malting barley are sprayed with full label rates of Caramba or Prosaro fungicides. A heads emerged spray with these triazole fungicides also helps protect upper leaves against fungal leaf blotches, powdery mildew, and rust. Foliar sprays of Caramba or Prosaro up to seven days after head emergence may still result in significant FHB and DON suppression. Unfortunately, Miravis Ace, a new fungicide product with activity against FHB, will not receive NYSDEC label approval in time for use on small grain crops this season. Fungicide products containing strobilurins should not be applied to headed wheat or barley as they may result in increased levels of DON in grain.
--Gary Bergstrom, Extension Plant Pathologist, Cornell University
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