[Fhb-update_cgp] FHB Update from OK, 04/12/19

[FHB Update - Central GP, Hard Winter Wheat]

During this past week, the first observation of stripe rust was made in
Oklahoma in southern/southwestern Oklahoma in Jackson County where Gary
Strickland (Extn Educator; Jackson County in SW OK) and Mike Schulz (Altus
Station Superintendent) found a low incidence of this rust on wheat in a
variety demo and in a producer’s field. Leaf rust also was observed at a
low incidence as was leaf spotting due to Septoria/Stagonospora. David
Nowlin (Extn. Educator; Caddo County in central Oklahoma) also continued to
observe leaf spotting. In scouting variety demos in Washita and Kiowa
Counties, Heath Sanders (SW Area Extn Agron Speclst) did not find any
powdery mildew, leaf rust or stripe rust. Around Stillwater, not much has
changed. Wheat is mostly between growth stages 8-9 (flag leaves emerging to
flag leaves fully emerged). I can still find hot spots of aphids (primarily
bird cherry-oat aphids) along with scattered powdery mildew and a low
incidence of leaf rust. Leaf spot diseases also are scattered and only on
lower leaves. Finding stripe rust this late and at this low of an incidence
typically indicates that stripe rust will not be much of a problem this year
in Oklahoma especially when coupled with limited reports of this rust in
Texas. However, leaf rust still has plenty of time to develop, especially if
temperature and free moisture on leaves continues to be favorable.

--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