FHB Update from PA, 04/22/19

Wheat and barley crops now range from tillering to Feekes 7 in most fields of Pennsylvania. Currently, PA is at a “low” risk of scab development because it has been too cool, and now we are entering a period of relative dryness. While the wheat in PA is too young to worry about scab right now, those of you wishing to apply a fungicide along with your growth regulator spray or any topdressing should scout for powdery mildew before doing so. We generally recommend only spraying for this disease if 5-10% of the fully expanded upper leaves are infected, and because it has been rather dry, your wheat may not meet this threshold. Scout your most densely planted areas first—these are the most likely to show signs of powdery mildew. As the crop approaches heading, visit wheatscab.psu.edu to use the Fusarium Head Blight Prediction Center. This forecasting tool tends to function best on the free Mozilla Firefox browser. If you are experiencing trouble with the forecast, visit in late morning when the tool fully updates. You can also sign up to have this commentary delivered to you via text or e-mail at scabusa.org/fhb_alerts .

--Alyssa Collins, Extension Field Crops Pathologist, Penn State 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