[Fhb-update_cgp] FHB Update from OK, 04/10/13

[FHB Update - Central GP, Hard Winter Wheat]

A couple of “firsts” occurred this week. Mark Gregory (Southwest Area
Extension Agronomist) reported the first leaf rust in Oklahoma for 2013. It
was on Overley near Devol, OK, which is near the Red River north of Wichita
Falls, TX. The wheat was at GS 10-10.1 (boot to heads just emerging), and
was in a field with quite a bit of damage from the freeze. From Mark’s
description, the prevalence was fairly low as he indicated he had to look
around quite a bit to find rust pustules. Along these lines, Dr. Jeff
Edwards and I recently updated “Foliar Fungicides and Wheat Production in
Oklahoma – April, 2013” (OSU Current Report CR-7668). This publication
provides answers to many of the common questions typically asked about wheat
foliar fungicides and provides a table listing the most common fungicides
available to control wheat foliar diseases.
 We also had our first confirmed sample of wheat streak mosaic in Fuller
wheat from southwestern OK (near Sentinel) in Washita County. This was in a
field that had been sprayed for volunteer wheat last fall. Perhaps
sufficient time was not allowed to elapse between the spraying of the
volunteer and the planting of the wheat in the fall – remember, two weeks
should be allowed between the complete death (not the spraying) of volunteer
wheat and the emergence of seedling wheat in order to kill the wheat curl
mites that transmit Wheat streak mosaic virus.
 Next week I’ll be looking around more of the state for diseases –
thankfully it is too rainy today!!!!


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

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