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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 (piclorant). Curtail (clopyrilid t 2,4-D), Barrel VanquisK,Garity (dicamba), 2,4-D, or <br />Banve[Nanquisli Clarity plus 2,4-D are commonly used. Apply these herbicides in spring or fall to <br />Plumeless thistle rosettes. <br />Apply Tordon at 0.5 to I pint per acre (A), Curtail at 2 quarts, A, Banvela'anquish/Clarity at 0.5 to 2 <br />quarts A, 22,44) at 1.5 to 2 quarts'A, Or BanyclNanquishA'larity plus 2,4-1) at 0.5 Plus 1 quart. Cool <br />temperatures (below so degrees F), particularly in fall, may adversely affect 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 he adversely affected but less than 2,4-D. Banvel Vanquish, Clarity plus 2,44D <br />works well in spring or fill. Apply any of these herbicides before Plumeless thistle bolts or seed production <br />still will occur. <br />Ally-Fscort (mctsulfuron) or Telar (chlorsulftrron) also can he used. Use Telar in noncrop areas only and <br />Ally-Escort in pastures, rangeland or noncrop areas. Research front COlOT`adO State University and the <br />University of Nebraska shows that Telar or Ally-Escort prevents or dramatically reduces viable seed <br />t6rnuation 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 dine. <br />Apply Telar at I ounce, A or Ally-Escort at 0.5 ounce,'A. Add a good agricultural Surfactant at 0.225 percent <br />%fv2 to Ally-Escort or Telar treatments or control is inadequate. <br />Scotch thistle <br />} <br />4 'r <br />41. ` <br />r t,?_. <br />