[Fhb-update_cgp] FHB Update from OK, 04/26/14

[FHB Update - Central GP, Hard Winter Wheat]

Wheat around Stillwater is mostly at GS 10.2 to 10.4 (heads ¼ to ½ emerged
from boot). Conditions are still dry, not only around Stillwater, but also
around much (if not all) of the state. Some rain fell this past week in the
one inch range in a few areas, but in southwestern OK it was most likely too
late to help the wheat. Freeze damage also is becoming much more apparent.

Dr. Jeff Edwards and I looked at wheat and attended a field day yesterday
evening near Apache, OK (about 75 miles southwest of Oklahoma City). The
variety trial and field at Apache is lost because of freeze. Wheat around
Chickasha was stressed with some freeze damage but was not nearly as bad as
the wheat around Apache. No foliar diseases were seen at any field at which
we stopped, and no reports of foliar diseases have come to me since my last
update (10-Apr). As you can tell from the reports below from Texas, there
just is not much inoculum south of us to be carried northward, and what does
blow up is likely not finding an environment conducive to infecting.

Our diagnostic lab has received few samples. Of two recent samples from
Garfield County (north-central OK), one was positive for Wheat streak mosaic
virus (WSMV) and the other was positive for WSMV and High plains virus. The
diseases caused by these viruses, which are transmitted by the wheat curl
mite, were fairly widespread in Oklahoma in 2013 and probably will be again
in 2014. However, I suspect that the drought and freeze will mask some of
these infections.


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

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