Oklahoma State University
Stillwater, OK

Oklahoma Alfalfa
Oklahoma Cooperative Extension Service
Oklahoma Agricultural Experiment Station

Summer Weed Control with Pursuit® and Sinbar®

Pursuit® applied after 1st or 2nd harvest can be very effective on broadleaf weeds.  At 4 oz/A, small pigweeds and some other broadleaf weeds are usually controlled.  However, it may only suppress some of the grasses at this rate.   

In our trials, we have had excellent season-long control of pigweeds with 4 oz/A applied after first harvest.  However, grass control has been erratic.  Producers should apply Pursuit® at 4 oz/A on small emerged weeds (less than 3 inches tall) after the first or second harvest when alfalfa regrowth is about 6 inches tall.  Pursuit® has both postemergence and residual activity, so you can expect summer-long weed control of susceptible weeds. Also, be aware of rotational crop guidelines after using Pursuit®.  It is 4 months for wheat and 18 months for sorghum (see label for other crops).   

Sinbar® applied after 1st harvest gives fair to good control of pigweeds, but only fair control of summer grasses.  For best result, it needs to be applied immediately after first harvest and receive within 1 week an inch of rain to incorporate it.   
 

Jim Stritzke
Former Alfalfa Weed Control Specialist
 
Department of Plant and Soil Sciences 
Oklahoma State University 

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