[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 17:47:18 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 favorable scab conditions occur. Applications to fully
headed fields may have some efficacy, but it may not be optimal. Sparse data
exist on heading applications and until we have a more complete picture I do
not recommend them. 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% suppression of
DON when applied within that 5 day window of the start of flowering. If
fungicides are applied to a moderately resistant variety, upwards of 70%
control may be achievable. Prosaro, Caramba, and Proline will 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



More information about the Fhb-update_ma mailing list