FHB Update from OH, 05/15/18

Although the wheat crop is now flowering in some southern counties, the scab forecasting system (http://www.wheatscab.psu.edu/) indicates that the risk of head scab is low (the map is green), suggesting that conditions have not been favorable for the scab fungus to infect. However, if you still plan to spray for head scab, Prosaro or Caramba should be your fungicides of choice. The new fungicide, Miravis Ace, which seems to be just as effective as Prosaro and Caramba, based on a limited number of trials, is probably not yet available. STAY AWAY from the strobilurins when it comes to head scab management. These fungicides tend to increase rather than reduce vomitoxin contamination.

Continue to monitor the crop and the weather in the north. Barley will begin heading-out later this week and into next week, while wheat is still about a week away from heading in the north and about two to three weeks away from flowering. There is still ample time to apply a fungicide for head scab and vomitoxin control, if conditions become favorable during the next few weeks.

--Pierce Paul, Extension Plant Pathologist, Ohio 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