Wheat is beginning to flower in some fields in Kentucky. Although the Fusarium head blight risk prediction is currently low, additional rain in the forecast for later in the week may raise the risk. From multi-state university research trials, the products that have shown to be the most efficacious in managing Fusarium head blight and the associated mycotoxin deoxynivalenol (DON; also known as vomitoxin) are Caramba, Prosaro, and Proline. The best application timing for management of Fusarium head blight and DON is when 50% of the plants in a field are beginning to flower (Feekes growth stage 10.5.1). University research has shown that fungicide applications within a few days after Feekes 10.5.1 (up to about 5 days), may provide similar control levels; however, it is important that preharvest intervals are observed and followed according to fungicide labels. Avoid applying fungicides that contain strobilurin active ingredients at late growth stages, as DON levels in grain may actually increase.
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