Research on Jointed Goatgrass In Oklahoma

Dr. Tom Peeper, Weed Scientist at Oklahoma State University in Stillwater, is researching two key jointed goatgrass control measures.  Peeper recently concluded research using sensor technology to determine which wheat cultivars compete well with jointed goatgrass.  Until Peeper conducted this research, winter wheat cultivars adapted to the southern Great Plains had not been screened for competitiveness with jointed goatgrass.  Research goals included using sensor technology to compare emergence, growth patterns, and stand morphology of wheat cultivars, and to identify traits associated with competitive ability that can be rapidly quantified using sensor technology.  Using data collected in 2000, varieties were ranked according to the effect of wheat cultivar on jointed goatgrass yield at three locations (Perkins, Orlando, and Lahoma).  Preliminary results indicate that the cultivars Betty, Triumph 64, Jagger, and Dominator may compete well with jointed goatgrass.  Final results from this study should be available by 2003.

     Peeper is also researching herbicide resistant wheat for jointed goatgrass management in Oklahoma production systems.  The Clearfield®  Production System for wheat from BASF will be on the market soon.  The system partners herbicide resistant wheat with an herbicide called Beyond® (imazamox).  Beyond selectively controls jointed goatgrass, cereal rye, downy brome, and other annual grass weeds in wheat.  Locally adapted cultivars of Clearfield wheat with the herbicide resistance gene are currently being developed.  Peeper and his research team will be investigating imazamox efficacy on jointed goatgrass and crop response.  One of their goals is to teach wheat producers how to successfully use imazamox-resistant wheat technology.  This four-year project began in July 2001.

To find out more about the research conducted by Dr. Tom Peeper please contact him at tfp@soilwater.agr.okstate.edu or contact Doug Schmale, JGG Extension Coordinator.