[Fhb-update_cgp] FHB Update from OK, 05/04/13

[FHB Update - Central GP, Hard Winter Wheat]

Over the last week, wheat was extensively examined around Stillwater, and in
central, southwestern, and north central Oklahoma. Wheat in southwestern
Oklahoma was damaged from drought and freeze, had little disease
discernible, and was in various states of head emergence with anthers just
starting to occasionally appear. In central OK, wheat was in various stages
of heading. Around Stillwater, wheat was just starting head emergence, while
at Lahoma wheat was mostly just approaching GS 10 (boot stage). There is
quite a bit of variability regarding stage of maturity depending on variety
and planting date. No leaf rust was observed at any location. Powdery mildew
and leaf spotting (septoria and tan spot) also were observed on lower to mid
leaves at many locations. Barley yellow dwarf was observed at many
locations, but it was often difficult to differentiate damage between BYD,
freeze, and drought. Wheat streak mosaic also was observed across the areas
examined. An increasing number of samples from western OK have tested
positive for BYDV, WSMV, or both, but no high plains virus or Triticum
mosaic virus has been detected. Here at Stillwater, Russian Wheat Aphid was
found and confirmed by Dr. Rick Grantham (Director of the Plant Disease and
Insect Diagnostic Lab).

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

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