[Fhb-update_ma] FHB Update from DE, 05/12/14
FHB Updates - Mid Atlantic SWW Region
fhb-update_ma at scabusa.org
Mon May 12 06:06:44 PDT 2014
The forecast is currently calling a 20-40% chance of storms in parts of
Delaware from Tuesday through Thursday. Most wheat is at Feekes 8-9, some is
close to heading. With the rain we had in parts of the region last week,
there is a chance that inoculum of FHB is starting to pick up and some
additional rain may be all that is needed to release inoculum. Those
individuals with fields that were heading late last week may enter flowering
during this period. If rain occurs in these areas an increase in FHB risk
may occur. You have a 5 day window to hit for fungicide applications after
the start of flowering without a significant dropoff in DON suppression.
The best fungicides for DON suppression are Prosaro, Caramba, and Proline.
Fungicides for FHB suppression will also handle foliar diseases, which have
been low in the canopy in most fields. 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 get you around
42-45% control of DON at unless they are applied to a moderately resistant
variety, in which case 75% control is achievable.
--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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