[Fhb-update_ma] FHB Update from DE, 05/14/14
FHB Updates - Mid Atlantic SWW Region
fhb-update_ma at scabusa.org
Wed May 14 18:08:09 PDT 2014
Current forecasts are calling for an 70-80% chance of heavy rain on
Thursday-Friday. Fields entering flowering around this time will likely be
at risk for scab. You have a 5-6 day window from the start of flowering
(Feekes 10.5.1 yellow anthers from the center of heads) where fields are
most susceptible and fungicides are most efficacious for suppression of
vomitoxin (DON) IF conditions favorable for development of FHB occur. The
best fungicides for DON suppression are Prosaro, Caramba, and Proline. Do
not use fungicides containing a strobilurin active ingredient (e.g. Quilt,
Aproach Prima, Stratego, Headline, Quadris, etc.) as strobilurins have been
associated with increased DON levels when applied to heads. Remember that
fungicide use gets you on average 42-45% control of DON when applied within
that 5 day window of the start of flowering AND the environment is conducive
for disease. If recommended fungicides are applied to a moderately resistant
variety over 70% control may be achievable. Prosaro, Caramba, and Proline
will also control common 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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