FHB Update from NY, 06/04/19

The Fusarium Risk Assessment Map (http://www.wheatscab.psu.edu/riskTool.html) continues to indicate a moderate to high risk of Fusarium head blight (FHB) for several areas of New York. Much of the state’s winter wheat will initiate flowering this week. The triazole products Caramba and Prosaro are the most effective fungicides for suppression of FHB and deoxynivalenol (DON) mycotoxin contamination when applied at flowering (emergence of yellow anthers on heads). A flowering application of triazole fungicide should be based on Fusarium head blight (FHB) risk as well as the risks of powdery mildew, rusts, and fungal leaf blotches in the upper canopy based on scouting of individual fields. There is an application window of approximately 7 days from the beginning of flowering in which reasonable FHB and DON suppression can be expected.

All but the latest planted winter barley is beyond the timing for a fungicide application. In barley, maximal suppression of FHB and grain contamination by DON results when fully emerged heads are sprayed with full label rates of Caramba or Prosaro fungicides. Application up to 7 days after full head emergence may still result in significant suppression of FHB and DON.

Attend Cornell’s Small Grain Management Field Day (http://events.cornell.edu/event/2019_small_grains_management_field_day ) on June 6 to learn more about integrated management of FHB and DON and to view the leading varieties of winter wheat, barley, and rye.

--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