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Page 1 3 of 23 <br />Management <br />Appendix I <br />Dill'use and spotted knapwced can be managed similarly. They are readily controlled with herbicides. <br />However, tltc weeds will reinvade unless cultural techniques are used. <br />Chemical Control of Diffused knapi eed <br />Research conducted at Colorado State University indicates that Tordon 22K (picloram) at 1 to 2 pt, A. <br />Translinc (clopyralid) at 0.67 to 1 pt, A, Curtail (clopyralid - 2,4-D) at 4 to 6 pt/A, or <br />BanvcI. Vanquish Clarity (dicantba) at Ito -2 pt, A Control diffuse knapwced. Tank mixes of <br />Banvel;'VanquishiC'larity plus 2.4-1) at I pt t 2 ptA or BanyelA Vanquish C'lenty plus Tordon 22K at I to 2 <br />pt : 0.5 to I pt A or Tordon plus 2,4-D at 0.75 pt + 2 pt ,A all control diffusc knapwced. These tank-mixes <br />may save money and reduce grass lttlirv resulting from higher use. rates ofa single herbicide. <br />Spotted knapwced and diffuse knapwced 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 />1-ordon (0.25 IN controls spotted knapwced tier two to three years. but the weed will reinvade the area <br />hitless other management techniques are used. <br />Mechanical Control of Diffused Knapweed <br />If desirable grass competition is evident in diffuse or spotted knapwced 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 />Yellow toadflax <br />y <br />1