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Page 7 of 23 <br />Chemical Control of Plumeless Thistle <br />Appendix I <br />Several herbicides are registered in pasture, rangeland and noncrop areas to control Plumeless thistle <br />Tordon 22K (picloram), Curtail (clopyralid +2,4-D), Banvel/Vanquish/Garity (dicamba), 2,4-D, or <br />Banvel/Vanyuish/Clarity plus 2,4-D are commonly used. Apply these herbicides in spring or fall to <br />Plumeless thistle rosettes. <br />Apply ~'ordon at O.S to I pint per acre (A), Curtail at 2 quarts/A, BanvelNanquish/Clarity at 0.5 to 2 <br />quarts/A, 2,4-D at I .S to 2 quarts/A, or BanvelNanquish/Clarity plus 2,4-D at O.S plus I quart/A. Cool <br />temperatures (below SO degrees F), particularly in tall, may adversely atTect 2,4-D control of Plumeless <br />thistle, therefore, use 2,4-D in spring. Tordon is largely unaffected by cool temperatures. <br />Banvel/Vanquish/Clarity can be adversely affected but less than 2,4-D BanvelNanquish/Clarity plus 2,4-U <br />works well in spring or fall Apply any of these herbicides before Plumeless thistle bolts or seed production <br />still will occur. <br />Ally-Escort (metsulfuron) or Telar (chlorsulturon)alco 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 developed terminal flowers have opened up to the size of a dime. <br />Apply T'elar at 1 ouncelA or Ally-Escort at O.S ounce/A. Add a good agricultural surfactant at 0.25 percent <br />v/v2 to :'111y-Escort or Telar treatments or control is inadequate. <br />Scotch thistle <br />