[Fhb-update_ma] FHB Update from VA, 05/03/16
FHB Updates - Mid Atlantic SWW Region
fhb-update_ma at scabusa.org
Tue May 3 12:25:48 EDT 2016
Due to the recent rain, scab risk is increasing in portions of Virginia,
especially on the Eastern Shore and coastal areas. Many fields are at or
near flowering. In most areas, moderately resistant (MR) varieties are in
the low to medium scab risk category, but keep in mind that many acres are
still planted to moderately susceptible (MS) or susceptible (S) varieties
such as Shirley. In the eastern portions of the state, scab risk is
projected to be high for susceptible varieties over the next week, and it
will likely be necessary to work in fungicide applications between rain
events. Fungicides targeting scab should be applied within 5-6 days of
flowering (50% of main tillers starting to flower from the center of the
head). Do NOT apply a strobilurin or fungicide pre-mix containing a
strobilurin after flag leaf emergence (Feekes 9) since this can increase DON
contamination in the grain. Prosaro, Caramba, and Proline are the most
effective products for reducing scab and DON contamination. These fungicides
will also control foliar diseases such as leaf blotch, stripe and leaf rust,
and powdery mildew. Stripe rust has been observed on susceptible wheat
cultivars in some fields for several weeks now, but levels remained low due
to dry conditions. The recent rain and humid conditions have resulted in
spread of the disease in some areas. Similar conditions are forecasted over
the next week and the disease has the potential to spread rapidly, so
growers should scout their fields immediately to determine if stripe rust is
present.
--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 http://www.scabusa.org
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