FHB Update from OH, 05/22/18

For those fields of wheat flowering and fields of barley head-out today (May 22), the risk for head scab is moderate in the northern-most counties and in the eastern portion of central Ohio. Persistent rainfall and high relative humidity over the last several days are the primary reasons for the moderate-risk prediction in those regions. But thanks to relatively cool temperatures, and dryer conditions in some cases, the risk remains low in most other areas of the state. However, this picture will likely change over the next few days as it warm-up, continues to rain, and more fields reach the flowering/heading growth stage. Continue to keep your eyes on the weather and the forecasting system, and be prepared to apply a fungicide. Wheat fields flowering and fields of barley still heading later this week and into the weekend (May 24-27) in the northern half of the state will likely be at the greatest risk for scab. Be prepared to protect them. Prosaro and Caramba are the two fungicides recommended for head scab management, and you will have a 4-5-day window from the day the crop reaches the critical growth stage (heading for barley and flowering for wheat) to make an application. Do remember to stay away from the strobilurins when the risk for scab is high as this group of fungicides has been linked to higher grain contamination with vomitoxin.

--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