FHB Update from MD, 04/21/19

Welcome to the FHB risk assessment for Maryland. This is our first commentary for this season, and they will be posted regularly throughout the small grain season from here on. Hopefully, you selected a resistant wheat variety for your planting this year after referring to the University of Maryland’s FHB evaluation of wheat varieties (https://psla.umd.edu/extension/extension-project-pages/small-grains-mary...). A good start goes a long way in managing FHB. Wheat in the Eastern shore of Maryland is either at jointing or booting stage and should be heading out in a week or so. Barley, however, is at heading or will be soon heading in this part of the state. It is important to note that the correct stage for spraying fungicides on wheat is at flowering (when the yellow anthers start to show on the heads), whereas on barley it is at heading (when the heads emerge out of the boots). Even with some intermittent showers, the FHB risk is currently predicted to be low across the state. However, with the rain forecast for this week, the risk may soon escalate. The right fungicides for FHB are Prosaro, Miravis-Ace or Caramba at the right stage of the crop. Fungicides containing strobilurin should not be applied for control of FHB, as in multiple university research trials, strobilurin fungicides have been shown to increase DON levels in grain. Up in the north in Frederick, Harford and nearby counties, wheat plants are starting to joint, and are not at a stage prone for FHB.

--Nidhi Rawat, Small grains Pathologist, University of Maryland

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