[Fhb-update_cgp] FHB Update from OK, 05/06/11

[FHB Update - Central GP, Hard Winter Wheat]

OKLAHOMA:  A trip yesterday to central Oklahoma (El Reno area) then to Kingfisher and Marshal (west of Stillwater) confirmed that barley yellow dwarf is the most prevalent disease this year in Oklahoma.  I saw very little leaf rust at any of these locations.  Powdery mildew, although present, was definitely in the “shut-down” mode.  Some fields and trials had what appeared to be damage from freeze and/or drought.  At Lahoma (west of Enid), Dr. Brett Carver (OSU Wheat Breeder/Geneticist) reported seeing some leaf rust but still at low levels, and also found a few isolated pockets of stripe rust.  In these areas and at Stillwater, wheat is mostly at the milk to soft dough stage.
	Around Stillwater where more moisture has been received, leaf rust is starting to increase (especially on susceptible varieties).  Dr. Art Klatt (OSU Wheat Breeder/Geneticist) reported seeing active and severe powdery mildew, and increasing levels of leaf rust (20-30S range) on his trial planted in a bottom area.  Similarly, leaf rust is increasing in the variety-demonstration trial planted at Stillwater, and in a fungicide trial.
	Samples continue to come into the Diagnostic Lab that test positive for various combinations of wheat streak mosaic virus, high plains virus, Triticum mosaic virus, and BYDVs.  Nearly all of these samples are from northwestern OK or the panhandle.

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

 For more details, go to the FHB Risk Assessment Tool at http://www.wheatscab.psu.edu/riskTool_2011.html