[Fhb-update_cgp] FHB Update from OK, 05/25/13

[FHB Update - Central GP, Hard Winter Wheat]

I and Nathalia Grachet (OSU Graduate Student) returned Friday from a trip
and field days in the panhandle of Oklahoma. Wheat at Lahoma (25 miles west
of Enid) ranged from full berry (watery) to the milk stage. Driving further
to the northwest after about Alva was depressing as the condition of the
wheat and the landscape in general deteriorated with what seemed like each
passing mile. The field days we attended were at Balko (40 miles east of
Guymon) and Hooker (20 miles northeast of Guymon). Wheat in these trials
ranged from flowering to full berry (watery). Rick Kochenower (Panhandle
Area Specialist – Agronomy) indicated that wheat in Cimarron County (far
western county in the panhandle) is all but gone primarily due to drought
whereas in Texas and Beaver County freeze and drought have both played a
role in severely impacting wheat production.

Leaf and stripe rust were found this past week around Stillwater but not at
a typical incidence or severity; leaf rust is especially lacking. Dr. Art
Klatt reported being able to easily find leaf rust in his plots near
Perkins, OK (15 miles south of Stillwater) in the range of 5-20S, which is
lighter than typical. At Lahoma, Nathalia and I found both leaf and stripe
rust but at low incidence and severity (especially leaf rust). Leaf spotting
was more common, but it was difficult to determine if this was Septoria,
Stagonospora, tan spot and/or physiological.

Signs of wheat streak mosaic and barley yellow dwarf can still be observed,
especially around Lahoma where flag leaves are still mostly green. In the
panhandle and northwestern OK it is difficult to discern virus damage from
freeze and drought.


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

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