[Fhb-update_cgp] FHB Update from OK, 04/17/13

[FHB Update - Central GP, Hard Winter Wheat]

Oklahoma Wheat Disease Update – 17 April 2013
Bob Hunger, Extension Wheat Pathologist
Department of Entomology & Plant Pathology
Oklahoma State University

 Just a few updates from last week. First, Mark Gregory (Southwest Area
Extension Agronomist) reported the first stripe rust in Oklahoma for 2013
(see attached photo). He found this stripe rust near Paul’s Valley on an
Endurance/Duster mix, and “had to look hard to find it.”
 David Nowlin (Caddo County Extn. Educator) sent in a wheat sample (Duster)
exhibiting symptoms typical of wheat streak mosaic. If confirmed, this would
be the second sample of WSM received from south central and southwestern OK.
 Dr. Art Klatt (OSU Wheat Geneticist) has been this last week in
Castroville, TX (far southern TX) rating breeder plots/lines for leaf and
stripe rust. He has reported that, “In Castroville there is heavy leaf
rust. We also found a little stripe rust but not enough to take readings and
it was beginning to shut down due to temps. “ In Oklahoma, Dr. Klatt has
reported seeing heavy powdery mildew in plots near Perkins, OK and at
Stillwater, but has not yet seen any leaf or stripe rust.
 Monday, 15-Apr, I and Nathalia Grachet (OSU Graduate Student) did plot work
at the variety trial near Apache, OK. Wheat there was approaching Feekes 10.
Flags leaves were out, but for most tillers, heads had not yet moved into
the boot. Freeze damage was the most striking symptoms in this trial and
surrounding fields, but tan spot/septoria/stagonospora, powdery mildew, and
barley yellow dwarf symptoms also could be found – but, no leaf or stripe
rust.
 Today (17-Apr) I checked my trials and nurseries here at Stillwater. Wheat
was at “pre” GS 10 with flag leaves fully out but the heads not yet
fully moved into the boots. Even where the boot internode was fully
expanded, the head was usually just beginning to move into the boot. I found
powdery mildew low, but no rusts at Stillwater. Spots indicative of BYDV
have appeared.


--Bob Hunger, Extension Plant Pathologist, Oklahoma State University

For more details, go to the FHB Risk assessment tool at
http://www.wheatscab.psu.edu