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Page 12 of 23 <br />Appendix 1 <br />Management <br />Diffitsa and spotted knapwced can be managed similarly. They are readily controlled with herbicides <br />I lowever• 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 _"_h (picloram) at I to _' pt/A, <br />Transline (clopyralid) at 0.67 to I ptr'A, Curtail (clopyralid + 2,4-D) at 4 to h pt, A. or <br />BanveliVanquishr'Clarity (dicamba) at I to 2 pt: A control diffuse knapwced. Tank mixes of <br />BanvcliVanquishr'( larity plus 2,4-D at I pt + 2 pt A or BanvcIA'anquish:Clanty plus Tordon 22K it I to 2 <br />pt + 0.5 to 1 ptf'A or Tordon plus 2,4-D at 0.75 pt • 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 knapwced generally occupy the same areas in Colorado, so the same <br />herbicide treatments can he applied. Weed scientists at Montana State University indicate that I pt/A of <br />Tordon (0.25 Ih) controls spotted knapwced for VWO to three yCarS, 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 knapwced stands, judicious herhicide <br />application that does not injure grasses may allow them to compete effectively with the weed.. Irrigation <br />(where possible) may help stimulate grass competition in these cases. I lowever, infested rangeland or <br />pastures often are degraded, allowing knapwced 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 />