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Auxin type herbicides such as 2,4 -d, dicarnha, MC'PA, and clopyralid have been effective with repeated applications <br />when plants are in the seedling or early bud stages (ityphosatc may also be applied as effective spot treatment, <br />Russian knapweed <br />'1anat!e•nae111 <br />t IFt 'tit t t rr,t In 1 :21C;;nl.tl,, tl;c kc■ it) ku )n,lhtitct t+'ntrtl! N 11+ stft the ttectI ,lr.tl .au,c sl lit c\ pend ttutncnt <br />in Its tout '.t•.lcth \Ii 111 tei.ratcd tftall.;Pt tllt'llt pt,;rt should ht tiu clopett that t'l.a es et N ltlll;i,i1 sues'• on the tt Cell <br />I lP rt flit\ Ott hest 1 1 1 artarerllerll p1,t11 II1clnJet t U tontrol tt all use IIaLlt_al and t +i ,hl l l lit , ;j t +lltf t1l <br />tet'utit,t•s 1 sulLlt comp)! lI sir mew.. sut ll <ss mutt lot' or af < herhi,ld,: us: ;flit !, not stiiiit}t'll1 <br />u'.41tin t,ri,110Act invades degraded area), ttnlutn.11+rft: tht plant tonuuunIL ■ anti deNlittt +le plants le <br />pal e111iiAI grassed Needing rornptilUve, perennial rritss pot ies (cultural tontrut) alter k;isslan knttptA et has been <br />slrtsud ht other control measures (set -up treatments) is essential Set -up treatments neat intlude chemical or <br />rile) hanlcal rllethrfds <br />('ooperativc research between Colorado State (' nversit∎ and the (tniversity of Wyoming stowed that chcmrcal set - up <br />treatments were superior to mowing. Curtail tclop}ralid + 2,4 - 1)i. I scort (metsulfuron), and Roundup (glyphosatc) were <br />used to suppress Russian knapweed. "Then perennial grasses were sown in late fall as a dormant seeding. 1 iltage i s <br />necessary to overcome the residual allelopathic efleets eft Russian knapweed Curtail (3 quarts per acre) (A) or (:scut ( t <br />ounce A) were applied at the bud - growth stage. Roundup was applied tw ice at I quart. A, first at the bud- growth stage <br />and again about 8 weeks later. Curtail controlled Russian knapweed test, but Roundup failed to control it <br />Norse of the herbicides injured seeded grasses. tirasses established similarly among herbicide suppression treatments, <br />even though Russian knapweed control varied. However, where 1'scort or Roundup was used to suppress Russian <br />knapweed, additional herbicide treatments would he neces,san to achieve acceptable control <br />