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Page 1 2 of 2 <br />Management <br />Appendix I <br />Diffuse and spotted knapweed can be managed similarly. They are readily controlled with herbicides. <br />I lowcyer. the NNeeds will reinyade unless cultural techniques are used. <br />Chemical Control of Spotted Knapwred <br />Research conducted at Colorado State University indicates that Tordon 22K (picloram) at I to 2 pt A. <br />Transline (clopyralid) at 0.67 to I pt A, Curtail (clopyralid '+ 2.4-I)) at 4 to 6 pt., A. or <br />BanveI,Vanyuish,CIarity (dicamba) at Ito 2 ptA control diffuse knapwecd. Tank Waxes of <br />BanveT'VanquisliClarity plus 2,4-D at I pt { '_ pt,A or BanveINanquish/'Clarity plus'Tordon 22K at I to 2 <br />pt + O.5 to I pt 'A or Tordon plus 2,4-D at 0.75 pt * 2 pt. A all control diffuse knapwecd. These tank-mixes <br />may save money and reduce grass injure' resulting from higher use rates of a single herbicide. <br />Spotted knapwecd and diffuse knapweed generally occupy the same areas in Colorado, so the saute <br />herbicide treatments can be applied. Weed scientists at Montana State University indicate that I pt'A of <br />1 ordon (0.=) lb) controls spotted knapwecd tar two to three years, but the weed will remade the area <br />unless other managctncnt techniques are used. <br />Mechanical Control of Spotted Knapwced <br />If dcsirtble grass competition is evident in diffuse or spotted knapweed stands, judicious herbicide <br />application that does not injure ;rasses may allow them to compete effectively with the weeds lrri,ation <br />(where possible) may help stimulate grass competition in these cases. However. inl*csted rangeland or <br />pastures often are degraded, allowing knapweed invasion, and herbicides alone will not restore the land to a <br />productiyc state. Seeding suitable perennial grasses is necessary to prevent Need remvasion. <br />Diffuse knapweed <br /> <br />