[Fhb-update_cgp] FHB Update from OK, 05/18/11

[FHB Update - Central GP, Hard Winter Wheat]

Wheat Disease Update –18-May-2011
Bob Hunger, Extension Wheat Pathologist
Department of Entomology & Plant Pathology
Oklahoma State University

Oklahoma:  Over the last week, I have been at field days in north central OK as well as in fields/trials around Stillwater.  Leaf rust has reached levels of 65-80% around Stillwater where there has been more rainfall, but levels on susceptible varieties are not consistent from field to field.  A few pustules of stem rust also were noted on stems of McNair 701 in a trap plot at Stillwater and have been sent to the CDL.  Yesterday I attended a field day north of Ponca City (@ Kildare – about 50 miles north of Stillwater) and then drove straight west  to Hwy 132 and south to Lahoma (about 15 miles west of Enid, OK).  Leaf rust was at low incidence at all the stops I made.  I did find a few plants with whiteheads that showed evidence of dryland (Fusarium) root rot, and an occasional symptom of septoria/tan spot.  Most of the wheat was at soft to medium dough.  Some fields looked decent while others were thin and obviously drought/heat stressed.  Barley yellow dwarf was still th
 e most prevalent disease, but I believe the discoloration associated with BYD must have been enhanced by the drought and/or heat and/or freeze and/or high winds we have experienced this spring.

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

 For more details, go to the FHB Risk Assessment Tool at http://www.wheatscab.psu.edu/riskTool_2011.html