[Fhb-update_cgp] FHB Update from OK, 04/12/16

[FHB Update - Central GP, Hard Winter Wheat]

Wheat varies around Stillwater, but mostly is at flag leaf emerged with the
heads approaching the boot. Brian Olson (my Technician) reported mostly the
same at Lahoma (15 miles west of Enid in north-central OK). Yesterday I was
in wheat fields near Talala, OK in NE OK, and wheat there ranged from flag
leaf emerging to awns starting to appear. Also, more wheat is showing or
starting to show drought stress across much of the state.

Regarding disease, stripe rust remains the most prevalent disease with
actively sporulating pustules still quite evident. I don’t believe there
has been much movement/increase in stripe rust because the weather has not
been conducive (no free moisture on leaves). Gary Strickland (Extn Educator;
Jackson County in SW OK) indicated the same thing to me earlier this past
week, i.e., that foliar disease (primarily stripe rust) seems to be in a
“holding pattern.” At Lahoma, Brian indicated seeing stripe rust but
only rarely on the flag leaves; mostly on leaves below the flag and at
varying degrees of severity. I also have seen leaf rust pustules on lower
leaves around Stillwater, but at low frequency. Powdery mildew also has
become more apparent around Stillwater but only in a few locations. Also
around Stillwater and in northeast OK yesterday, I saw colonies of greenbug
but not in great numbers. However, because of these aphids and earlier high
numbers of aphids (especially bird cherry-oat aphids), I am starting to see
more and more “hot spots” of barley yellow dwarf.


--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 http://www.scabusa.org