[Fhb-update_ma] FHB Update from MD, 05/09/16
FHB Updates - Mid Atlantic SWW Region
fhb-update_ma at scabusa.org
Mon May 9 09:40:08 EDT 2016
Wheat in Maryland that will come into flower during the week of May 9 will
be at high risk for developing scab. Fungicides should be applied as close
as possible as equipment and weather permits to the initial flower to five
days after application window. If wheat is not fully headed and there are no
signs of anthers it is too early to spray. There are no visual cues that
your field is only a day or two from flowering rather than five to seven.
The only recommended products are still Prosaro (Bayer) and Caramba (BASF),
and they should be applied at early flower to five days after. This
application window has been shown to give the greatest reduction of
vomitoxin. However, these products even when applied at the optimum timing
(early flower) can only reduce the vomitoxin, DON, by 40-60%. Spraying very
susceptible to susceptible wheat cultivars when conditions are high risk for
an extended period starting at flowering may still have unacceptable DON
levels at harvest. This is why integration of resistance with fungicides has
been recommended to manage scab.
--Arv Grybauskas, Extension Plant Pathologist Emeritus, University of
Maryland
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 http://www.scabusa.org
More information about the Fhb-update_ma
mailing list