[Fhb-update_cgp] FHB Update from OK, 05/11/13

[FHB Update - Central GP, Hard Winter Wheat]

As you move from southern to northern/northwestern Oklahoma, wheat ranges
from past flowering to flowering to heads emerging/approaching flowering
(depending on variety and planting/emergence date). It is highly variable.
Weather continues to be cool and moist except in southern, western and
northwestern Oklahoma where it continues to be dry.
 There were no reports of leaf rust over the last week in Oklahoma, but
reports of stripe rust increased. Powdery mildew continues to be found but I
have not seen it yet on flag leaves or even F-1 leaves. Leaf spotting
diseases (tan spot, septoria, stagonospora) are more severe in Oklahoma than
typical but vary by location.
 Barley yellow dwarf is commonly observed at all locations, but is not
associated with severe stunting indicating a later infection. Numerous
reports have been received and many samples have now tested positive for
wheat streak mosaic virus from many areas of Oklahoma. None of these samples
have tested positive for either High plains virus or Triticum mosaic virus.

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

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