[Fhb-update_ma] FHB Update from DE, 05/19/14
FHB Updates - Mid Atlantic SWW Region
fhb-update_ma at scabusa.org
Mon May 19 20:38:39 PDT 2014
Delaware and parts of Maryland continue to be in moderate to high risk level
for scab. Moderate risk levels may continue with a 30-40% chance of rain in
some areas on DE and MD from Tuesday-Thursday. Fields entering flowering are
at the highest risk for scab. The best fungicides for scab are Prosaro,
Caramba, and Proline. Do not apply products containing a strobilurin (e.g.
Aproach Prima, Quilt, Stratego, Headline, Quadris, etc) as strobilurins have
been associated with elevated DON levels when applied to the head and scab
occurs. There is a 5-6 day window after the majority of a field is flowering
and conducive weather occurs to make a fungicide application and maximize
efficacy. Ground rigs should have nozzles angled at least 15 degrees in the
forward direction (30 degrees is optimal) and apply at least 10 gallons per
acre, with 15-20 being optimal. Aerial applicators should apply at 5 gallons
per acre. Shoot for 300 to 350 micron droplet size. Prosaro, Caramba, and
Proline will control foliar diseases.
--Nathan Kleczewski, Extension Specialist, University of Delaware
For more details, go to the FHB Risk assessment tool at
http://www.wheatscab.psu.edu
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