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Page 7 of 23 <br />Chemical Control of Plumeless Thistle <br />Appendix 1 <br />Several herbicides are registered in pasture, rangeland and noncrop areas to control Plumeless thistle. <br />Tordon 22K (picloram). Curtail (clopyralid i 2,4-17)), BanyeliVanquishiClarity (dicamba), _'.4-D, or <br />BanvelA'anquish.'Clarity plus 2,4-D are commonly used. Apply these herbicides in spring or fail to <br />Plumeless thistle rosettes. <br />Apply Tordon at 0,5 to I pint per acre (A), Curtail at 2 quartsrA, Banvel,'VanquisivC'larity at 0.5 to 2 <br />quarts,'A. 2,4-1) at 1.' i to 2 quarts,,A, or Bung-elr1'nnquish,C'larity plus 2,4-D at 0.5 plus I quartiA. Cool <br />temperatures (below 50 degrees F), particularly in fall, may adversely affect 2,4-D control of Plumeless <br />thistle; therefore, use 2,44D in spring. Tordon is largely unaffected by cool temperatures. <br />Banvel'Vanquish,,Clarity can be adversely affected but less than 2.4-D. Banvel'Vanquish`Clarity plus 2,4-1) <br />works well in spring or fall. Apply any of these herbicides befiue Plumeless thistle bolts or seed production <br />still will occur. <br />Ally-Escort (mctsulfuron) or Telar (ehlorsulfuron) also can be used. Use Telar in noncrop areas only and <br />Ally-Escort in pastures, rangeland or noncrop areas. Research from Colorado State University and the <br />University of Nebraska shows that Telar or Ally-Escort prevents or dramatically reduces viable seed <br />formation when applied in spring, up to early flower growth stages. The latest time to apply these <br />herbicides is when devclopcd terminal flowers have opened up to the size of a dime. <br />Apply Telar at 1 ounce'A or Ally-Escort at 0.5 ounceiA. Add a good agricultural surfactant at 0.2s percent <br />v/v2 to Ally-Fscort or Telar treatments or control is inadequate. <br />Scotch thistle