Ryan Sproul

Well I hope everyone is enjoying this nice weather we have been getting and with the occasional shower and the warmer temperature, we should be getting some grass growing.  For this week’s column, I wanted to update everyone on the wheat disease situation.  This information comes from Dr. Bob Hunger, OSU Extension Wheat Pathologist.  He has been scouting his research plots around Stillwater and here are his observations from last week.  “March 10 was spent in many fields around Stillwater.  Symptoms of wheat soil borne mosaic are being strongly expressed in many fields.  I also saw symptoms of wheat spindle streak mosaic in ‘Sierra’ but not nearly as strong as the soil borne mosaic symptoms in susceptible varieties such as ‘Vona’.  Symptoms of barley yellow dwarf virus were apparent in early planted (mid-September) trials, most notably a seed treatment trial (not an insecticide trial) and the early planted variety-demo, which also was planted in mid-September.  Aphids were plentiful in these areas last fall.  Interestingly, the late planted (late October) variety-demo shows very limited barley yellow dwarf virus symptoms.  In all of the wheat I looked at and rated yesterday and today, I saw active leaf rust pustules only in a strip of Jagalene that had been planted in mid-September and has not been grazed or mowed.  I looked at about 15 spots in this strip and found a few scattered pustules in only one place.  Slightly higher levels of powdery mildew were observed in this wheat strip and in a few other locations.  The only other disease report I’ve received so far in Oklahoma is from Mark Gregory (OSU Extension Area Agronomist – SW Oklahoma), who indicated that his area is dry – so dry that he has not seen dew formed for some time now.”  Please feel free to contact us here at the OSU Extension Office if we can be of any further help.  Our phone number is 918-253-4332, or stop by and see us in the office at the Delaware County Fairgrounds.  Have a good week!!

Oklahoma State University, U.S. Department of Agriculture, State and Local Governments

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