[Fhb-update_cgp] FHB Update from OK, 04/10/14

[FHB Update - Central GP, Hard Winter Wheat]

Bob Hunger, Extension Wheat Pathologist
Department of Entomology & Plant Pathology
Oklahoma State University

Wheat around Stillwater is mostly at GS 7 (2 nodes detectable). In a few
places the flag leaf has emerged but only in one field. I still have not
received reports of significant foliar diseases in Oklahoma, which is not
surprising given the dry conditions. Around Stillwater I have seen some
powdery mildew on low foliage in scattered spots. I and my technician Brian
Olson also found tan spot in a no-till field, but only on low foliage and
not severe. The one find of a different disease that is concerning was wheat
streak mosaic (WSM) in Dr. Jeff Edward’s variety trial in Kay County near
Kildare. Visiting the trial on April 2nd, yellowing and streaking were
present in all varieties but some were much worse than others. I was not
thinking about WSM at the time, but 5 samples I brought back to the lab all
tested positive for the virus that causes WSM, so I believe that is what is
present. For more information on WSM and other mite-tansmitted viruses, go
to 
 http://osufacts.okstate.edu and access EPP-7328

On a trip today to northern Oklahoma and over to Lahoma in north central
Oklahoma, I saw some good and some bad wheat that ranged from GS 6 to GS 7
(or close to it). However, all the wheat seemed short to me – some not
much more than 10-12 inches tall.

In northwestern Oklahoma, Rick Kochenower (Area Res & Extn Agron Spclt)
indicated, “I see a lot of dryland wheat dying but not from disease.” He
said that wheat was just starting to tiller. In
southern/central/southwestern Oklahoma, Mark Gregory (Area Extn Agron Spclt)
reported that today he was in wheat towards the eastern side of the district
and saw no diseases; also that the wheat furthest along had flag leaves
fully extended (GS 9). Gary Strickland (Extn Educator, Jackson County –
southwestern OK) indicated wheat in his area was in the flag leaf stage –
anywhere from flag leaf just emerging to fully-emerged. Drought is the
problem; no rust, powdery mildew or other diseases, but brown wheat mites
have exploded.

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

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