[Fhb-update_cgp] FHB Update from OK, 05/31/18

[FHB Update - Central GP, Hard Winter Wheat]

Wednesday through Friday (May 23-25) of last week, I was in western Oklahoma
(Clinton area) and at field days in the panhandle at Goodwell and Hooker
(Texas County), Keyes (Cimarron County) and Balko (Beaver County). The only
disease observed of significance was indicated by white heads in fields.
Often this was the result of Fusarium (dryland) root rot as reported in the
last update (May 17, 2018). In fields showing this root rot, the white heads
and white tillers were scattered across the field with an incidence ranging
from low to moderate. Other fields in the panhandle exhibited large areas of
not just white heads and tillers, but also white secondary tillers that had
not headed. In these fields, some root rot was found but Dr. David Marburger
(OkSU Small Grains Extension Specialist) and I believe that many of the
white tillers/secondary tillers were the result of drought, freeze, or a
combination of both. Often such tillers showed clean lower stems with no
indication of root rot. We believe these secondary tillers were completely
white without heading because they were sloughed off as a result of the
stress from drought, freeze, or a combination of both. We suspect that more
of these whiteheads will show in the coming week in northwestern OK and the
panhandle, but the wheat crop is quickly turning and the whiteheads may not
be as evident.

This likely is the last update I will be sending out this season as harvest
in the southern half of Oklahoma has started with the crop quickly maturing
in the northern half.


--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