[Fhb-update_ma] FHB Update from MD, 05/15/13
FHB Updates - Mid Atlantic SWW Region
fhb-update_ma at scabusa.org
Wed May 15 05:28:20 PDT 2013
The risk of scab has returned to low in Maryland. Wheat that began to flower
a few days before Mother's day to Mother's day is the only crop that was at
risk of significant scab so far this season. The risk of scab for wheat that
has not yet come into flower will depend on when they begin to flower and
when and if rainfall occurs. Temperatures are expected to be favorable for
the near future. Fungicides are only recommended for the crop that began to
flower near and up to Mother's day. The window for application is the day
flowering begins to about 5 days later. For wheat that has not yet flowered
no fungicide is required but continue to monitor this site for possible
changes of risk assessment as it approaches flowering. Note symptoms of
frost damage of wheat that was in flower to early dough when frost occurred
will resemble scab symptoms. No fungicide will change that or protect
against that. Frost damaged wheat does not need a fungicide treatment to
prevent other diseases any more than non-frosted wheat. Make fungicide
decisions on the basis of disease presence or risk. No
strobilurin-containing fungicide should be used this late in the season as
you risk increasing vomitoxin levels if scab does occur.
--Arv Grybauskas, Extension Plant Pathologist, University of Maryland
For more details, go to the FHB Risk assessment tool at
http://www.wheatscab.psu.edu
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