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Control of Potentilla recta in an Undisturbed South Puget South Prairie.

Cliff Chapman.  The Nature Conservancy of Washington, 120 E. Union Ave, Olympia WA, 98501. 360.357.6280.  cliff_chapman@tnc.org.

Large remnants of South Puget Sound prairies persist on Fort Lewis, an active military training installation located between Tacoma and Olympia, Washington.  A large artillery impact area burns frequently and sees little human disturbance; two factors which aid in it being considered the highest quality prairie in the region.  The area is free of most locally invasive species.  In spring of 2006, a large population of Potentilla recta (sulfur cinquefoil) was discovered and subsequently treated using backpack sprayers.  A 3% foliar spray solution of 2-4-D ester did not control the species.  A 2.5% foliar spray solution of triclopyr (Garlon 3A) proved to be an effective control technique.