[Fhb-update_cgp] FHB Update from OK, 04/23/16

[FHB Update - Central GP, Hard Winter Wheat]

Correction: In my last update, I indicated Prosaro (Bayer CropScience) as
the only fungicide labeled for application at a growth stage (GS) later than
full head emergence (GS 10.5). Caramba (BASF) also is labeled for
application through GS 10.5.1, which is the beginning of anther emergence
(flowering). Sorry for the omission.

Rain over the last week was extremely beneficial to wheat across Oklahoma,
with the cool, cloudy and wet weather also serving to slow down wheat
progression. Wheat around Stillwater is basically at flowering. Gary
Strickland (Extn Educator; Jackson County in SW OK) indicated wheat in his
area experienced some hail damage, and Greg Highfill (Extn Educator; Woods
County in NW OK) indicated that although not widespread, he has seen a bit
more freeze damage than expected. Overall though, my impression is that
freeze damage is minimal. Cool temperature and rain also will facilitate
foliar disease development. Especially over the last several days, there has
been extended periods of dew on wheat, which provides an optimum environment
for increasing foliar diseases. As temperature now rises, leaf rust should
become more common. Brian Olson (Senior Agriculturalist OSU) spent yesterday
rating breeder lines here at Stillwater. He reported seeing some active
stripe rust, but increasingly more powdery mildew, leaf rust, and barley
yellow dwarf. Dr. Brett Carver (OSU Wheat Breeder) reported much the same at
the Pasture Research Center near Marshall, OK (about 30 miles west of
Stillwater). However, stripe rust is still active as indicated by a report
from J. Wes Lee (Extn Educator; McClain County in central OK).

--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