[Fhb-update_ma] FHB Update from VA, 04/30/18
FHB Updates - Mid Atlantic SWW Region
fhb-update_ma at scabusa.org
Mon Apr 30 12:21:39 EDT 2018
As wheat starts flowering in the region, it is time to consider whether or
not to make a fungicide application for Fusarium head blight (FHB).
Currently, risk is low in most parts of Virginia. There are a few
exceptions, including portions of the Eastern Shore, where risk is moderate
to high. The most effective fungicides for control of FHB and DON are
Caramba (metconazole), Prosaro (prothioconazole + tebuconazole), and Proline
(prothioconazole). Less expensive triazoles such as Tilt (propiconazole) and
Folicur (tebuconazole) will provide some control, but if FHB risk is high
these fungicides are unlikely to prevent unacceptable levels of DON
contamination. Keep in mind that fungicides containing a strobilurin should
not be applied after the flag leaf stage since they can increase DON
contamination. To maximize their effectiveness, fungicides for FHB and DON
control should be applied at early flowering or up to one week later.
Fungicides that control FHB and DON will also control foliar diseases
including powdery mildew, leaf rust, stripe rust, and leaf blotch. Stripe
rust has been found in NC and was recently reported from a single field in
Warsaw, VA so be sure to scout susceptible varieties for this disease. For
specific wheat disease management recommendations or assistance with disease
identification, contact Dr. Hillary L. Mehl (hlmehl at vt.edu).
--Hillary Mehl, Extension Plant Pathologist, Virginia Tech
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
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