FHB Update from MO, 05/15/19

Risk for FHB development remains high for much of the state, especially for varieties that might be considered susceptible or moderately susceptible to FHB that may be flowering or approaching flowering in the next few days. In the coming days, FHB risk is predicted to wane slightly in some areas going into the weekend but will remain at moderate to high levels for a majority of the state. However, with more wet weather predicted in the coming week, that risk could very likely increase again. Fungicides are an integral part of an effective integrated pest management program for managing FHB and associated mycotoxins. Fungicides in the triazole class such as Prosaro or Caramba are most effective when applied at 50% flowering, or Feekes 10.5.1 (50% of heads are flowering) but can be applied up to 5 days after flowering and still provide similar control. Strobilurin-containing fungicides are NOT labeled for the control of FHB and may result in increased DON levels in the grain. It is important to always follow harvest restrictions and label instructions when applying fungicides.

--Kaitlyn Bissonnette, Extension Plant Pathologist, University of Missouri

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