[Fhb-update_cgp] FHB Update from OK, 05/01/17

[FHB Update - Central GP, Hard Winter Wheat]

The last three days of last week were spent in southwestern (Altus), central
OK (Apache & Chickasha) as well as here around Stillwater. Wheat I saw at
those locations ranged mostly from milk to soft dough, with some even
approaching medium dough. I’m not sure about wheat in northern OK and over
into the panhandle. The Panhandle is of particular interest with the far
western parts of it receiving significant snow (up to 6-12 inches I heard on
weather reports around Boise City).

Flag leaves on wheat across southwestern and in central OK are mostly gone
as a result of rust (both stripe and leaf, but primarily leaf rust I think),
wheat streak mosaic, and barley yellow dwarf. I saw little active stripe
rust, but did see more active leaf rust. An abundance of leaves showed rust
telia, but again, mostly leaf rust (I think). I also saw scattered white
heads in wheat at Altus. Examination showed dark lower stem internodes and
splitting of stems revealed cottony fungal growth in the lowest internode
with a reddish/pinkish color indicating Fusarium root rot as the most likely
cause. A sample of white plants with mostly sterile heads was brought to a
field day at Apache, OK in central OK; examination revealed take-all as the
likely cause. Barley yellow dwarf was present at all locations, but seemed
more prominent at Chickasha.

As in my last update, Wheat streak mosaic virus (WSMV) continues to be found
and reported across a large area of western Oklahoma. The cool wet weather
will likely help manage infected plants to continue to mature, but yields
definitely will be significantly impacted. For more information on
mite-transmitted wheat viruses such as WSM, please see OSU Fact Sheet
EPP-7328 (Wheat Streak Mosaic, High Plains Disease, and Triticum Mosaic:
Three Virus Diseases of Wheat in Oklahoma) available at
http://pods.dasnr.okstate.edu/docushare/dsweb/HomePage


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

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

For the latest news and updates from the U.S. Wheat & Barley Scab
Initiative, go to https://www.scabusa.org