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Page 12 of Z3 Appendix I <br />Management <br />Diffuse and spotted knapweed can be managed similarly. They are readily controlled with herbicides. <br />I lowcver, the weeds will reinvade unless cultural techniques are used. <br />Chemical Control of Spotted Knapweed <br />Research conducted at Colorado State university indicates that Tordon 22K (picloram) at I to 2 pt, A, <br />Translme (clopyralid) at 0.07 to I pt A, Curtail (clopyralid - 2,4-D) at 4 to G pt'A. or <br />Havel, Vanquislv'Clarity (dicamba) at 1 to 2 pVA control diffuse knapweed. Tank mixes of <br />Bam-el!'Vanquishi'Clarity plus 2,4-D at I pt F _ pt. A or BanvclA anquishi'Clanty plus Tordon 22K at 1 to 2 <br />pt + 0.5 to 1 IWA or Tordon plus 2,4-D at 0.7i pt , 2 pvA all control diffuse knapweed. These tank-mixes <br />may save money and reduce grass injury resulting from higher use rates of a single herbicide. <br />Spotted knapweed 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 1 pvA of <br />Tordon ((1.25 lb) controls spotted knapweed for two to three years. but the weed will reinvade the area <br />unless other management techniques are used. <br />Mechanical Control of Spotted Knapweed <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. however, 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 reinvasion. <br />Diffuse knapweed <br /> <br />? r <br /> <br />I if"