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Page 13 o1'23 <br />Management <br />Nppendix I <br />Diffuse and spotted knapweed can be managed similarly. They are readily controlled with herbicides. <br />I lowever, the weeds will rein,,ade unless cultural techniques are used. <br />Chemical Control of Diffused knap-,%eed <br />Research conducted at Colorado State University indicates that Tordun 221 (pirloram) at I to 2 pUA, <br />Transline (clopyrahd) at 11.67 to I pt'A. Curtail (clopyralid i 2,4-D) at 4 to 6 pt A. or <br />Bane el, Vanquish, Clarity (dicamba) at I to _ pt ,'A control diffuse knapwced. Tank mixes of <br />Banvel, Vanquish/Clarity plus 2,4-D at I pt f 2 puA or BaneeliVanyuish.,Clarity plus Tordon 22K at I to 2 <br />pt t 0.5 to I puA or Tordon plus 2,4-D at 0.75 pt i 2 pt,A all control diffuse knapwced. These tank-mixes <br />may save money and reduce grass injury resulting from higher use rates of a single herbicide. <br />Spotted knapwced and diffuse knapweed generally occupy the same areas in Colorado, so the same <br />herbicide treatments can be applied. Weed scientists at Montana State University indicate that I pt. A of <br />Tordun (0._'' 5 Ih) controk spotted knapwced for two to three years, but the weed will rein\ ade the area <br />unless other management techniques are used. <br />Mechanical Control of Diffused Knaprreed <br />If desirable grass competition is evident in diffuse or spotted knapweed stands, judicious herbicide <br />application that does not injure grasses may allow them to compete effectively with the weeds. Irrigation <br />(where possible) may help stimulate grass competition in these cases. Ilowever, infested rangeland or <br />pastures often are degraded, allowing knapweed invasion, and herbicides alone will not restore the land to a <br />productive state. Seeding suitable perennial grasses is necessary to prevent weed rein anion. <br />Yellow toadtlax <br /> <br /> <br /> <br />11 <br /> <br />? z I