[Fhb-update_cgp] FHB Update from OK, 04/29/11

[FHB Update - Central GP, Hard Winter Wheat]

Oklahoma – 29-Apr-2011:  Barley yellow dwarf definitely is the most prevalent disease across Oklahoma.  Dr. Brett Carver (OSU wheat breeder) observed widespread BYD symptoms in breeder plots across northern Oklahoma.  The same is true here around Stillwater and to the west of Stillwater.  Around Stillwater and west to Marshall, wheat is past flowering with berries being fully formed to milky.  The nearly 2 inches of rain this past weekend likely will start some foliar diseases, but the only place I could find significant leaf rust in trials around Stillwater was in a strip of Jagalene that was planted early last fall.  This strip, which has leaf rust in the 25-65% range on the flag leaves, was also hit hard with powdery mildew and BYD.  Scattered leaf rust pustules can be found in susceptible varieties in other fields/plots.  In the diagnostic lab over the last week, samples have been diagnosed with brown wheat mite damage (southwestern, OK), with wheat streak mosaic virus,
  high plains virus, Triticum mosaic virus (panhandle), and with BYDV (northeastern OK).  Rick Kochenower (Area Res & Extn Spec – Panhandle) confirmed that only virus diseases such as BYD, WSM, etc. are appearing in 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