[Fhb-update_cgp] FHB Update from OK, 04/08/13

[FHB Update - Central GP, Hard Winter Wheat]

05-Apr-2013: Not much to report disease-wise in Oklahoma from this past week
with the exception of cool/cold temperature and good rainfall over a
considerable portion of the state that should favor foliar disease
development. Reports indicate wheat is reaching the flag leaf stage (Feekes
GS 8-9) in southern and southwestern Oklahoma, but behind that to the north.
I have not heard of any wheat yet heading out in Oklahoma.
 One sample via a photo came in from Dr. Jeff Edwards showing tan spot
symptoms on wheat in a no-till situation. The circumstances sound the same
as what I talked about in my last update (21-Mar-2013), i.e., wheat in heavy
residue covered with spore-producing resting bodies of the fungus that
causes tan spot. From such samples, I also typically isolate septoria. A
field such as this is a prime candidate to be sprayed early to help control
the tan spot and septoria. HOWEVER, with the strong freeze about 2 weeks
ago, be sure to assess damage from that freeze as Dr. Edwards recently
observed and reported severe freeze damage in this area of the state.
 As far as I know, leaf and stripe rust are doing fine in far southern Texas
and the southeastern U.S. but there still are no reports of rust in
Oklahoma. Mark Gregory (Southwest Area Extension Agronomist) indicated to me
today that he has seen no rust (leaf or stripe) and only mild powdery
mildew. Again, this may change during the next week or so given or weather
for this past week.

Bob Hunger – Extension Wheat Pathologist – Oklahoma State University


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

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