In my travels in the southeastern part of Illinois earlier this week, wheat fields from Pope to Clay Counties were headed out and many were also flowering. The risk of Fusarium head blight (FHB) has recently changed to a moderate risk for much of southern Illinois. Based on the rainy and cloudy conditions that have occurred in these areas, spraying an effective fungicide for FHB management is encouraged. Research at the University of Illinois and other universities has shown that Caramba and Prosaro fungicides are the most efficacious fungicides available in reducing FHB and the associated mycotoxin, deoxynivalenol (DON; a.k.a "vomitoxin"), that can contaminate grain. The best fungicide application timing for FHB management is when flowering is beginning to occur (Feekes growth stage 10.5.1), when anthers are beginning to extrude from the middle part of the wheat heads.
--Carl Bradley, Associate Professor / Extension Plant Pathologist, University of Illinois
For more details, go to the FHB Risk assessment tool at http://www.wheatscab.psu.edu