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Page 13 of 23 <br />Management <br />Appendix I <br />Diffuse and spotted knapweed can be managed similarly. They are readily controlled with herbicides. <br />lowever, the weeds will reinvade unless cultural techniques are used. <br />Chemical Control of Diffused knapweed <br />Research conducted at Colorado State University indicates that Tordon 22K (picloram) at I to 2 pvA. <br />Transhne (clopyralid) at 0.67 to I pt.'A, Curtail (clopyralid i 2.4-D) at 4 to 0 pt'A, or <br />Banvcl.'Vanquish/C'larity (dic.mtba) at I to _' pt., A control diffuse knapweed. Tank mixes of <br />Banvel;' 'anguish/Clarity plus 2,4-D at 1 pt t pvA or Banvel. VanquishXlarity plus Tordon 22K at 1 to 2 <br />pt { 0.5 to I pt: 'A or Tordon plus 2,4-D at 0.75 pt 1 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 generalh occupy the same areas in Colorado, so the same <br />herbicide treatments can be applied. Weed scientists at IMonuuta State I lnrversit) indicate that 1 pt, A of <br />Tordon (0.25 Ib) controls spotted knapweed t6r two to three years. but the weed will reinvade the area <br />unless other management techniques are used. <br />Mechanical Control of Diffused 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. I lowever, infested rangeland or <br />pastures often are degraded, allowing knapweed invasion, mid herbicides alone will not restore the land to a <br />productive state. Seeding suitable perennial grasses is necessatN' to prevent weed rcinvasion. <br />Yellow toadflax <br />