[Fhb-update_ma] FHB Update from DE, 05/15/14

FHB Updates - Mid Atlantic SWW Region fhb-update_ma at scabusa.org
Thu May 15 05:59:51 PDT 2014


Delaware and parts of Maryland are now in a moderate to high risk level for
scab. I expect this risk to continue through the weekend with heavy rains
expected tonight and Friday. 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 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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