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MSMA Update for Turfgrass Applications:
EPA Revisions

Patrick McCullough and Clint Waltz
Extension Specialists, University of Georgia

In January 2009, the Environmental Protection Agency (EPA) passed new regulations on future use of MSMA for weed control in turfgrasses.  Several misinterpretations of the reregistration decision by the EPA have been sent throughout the turfgrass community.  This alert addresses these misinterpretations and clarifies details of new regulations passed by the EPA for MSMA use in turf.


Residential and Athletic Field Turf

Effective January 1, 2010, MSMA will no longer be labeled for use on residential turf, drainage ditch banks, railroad, pipeline, and utility rights-of-way, fence rows, storage yards, and similar non-crop areas.  Any previously purchased stocks of MSMA products may be applied until December 31, 2010.


Golf Courses, Sod Farms, and Highways

All uses of MSMA and all currently registered uses of DSMA, CAMA, and DMA may be used until December 31, 2009.  MSMA use on golf courses, sod farms, and highway rights-of-way will be cancelled as of December 31, 2012.  Use of existing MSMA stock will be allowed until December 31, 2013.  Golf course use is limited to spot treatments not to exceed 100 square feet per spot, or 25% of total golf course acreage per year.  One broadcast application is allowed for newly constructed golf courses and sod farm use is limited to no more than two broadcast applications per season.  A 25-foot buffer zone must be maintained around permanent water bodies.  Only two broadcast applications per year are allowed for use on highway rights-of-way and a 100-foot buffer zone must be maintained around permanent water bodies.

The use of MSMA in turf continues to be a fluid situation as further clarification and understanding is determined.  When additional information becomes available, it will be provided and posted on  To see the current EPA’s amendment to organic arsenical herbicides, please visit


Please share this information with others in the landscape & turf industry. For more information:


Call your local Extension Agent at (800) ASK-UGA1 or locate your local Extension Office at


Pest Management Handbook (Follow all label recommendations when using any pesticide) -

For more Landscape Alerts please visit the Georgia Center for Urban Agriculture



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