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P:eg~ I I3 of <br />Appnndit l <br />Like other crerepmg perenni:ds, the kcv to Russran knupwecd control !s to stress the treed and cause n to <br />expend nuureni NPICS IO Its IIN,I Syblem •~II rml'gItlIC{I 1118iat(Clllenl Irlall shlrtdd bC drvrloptd shat ph+ot-s <br />connnuul stress on Ihr trcKd (uncntly, the hest management plmt mcludrs cuhurnl control wmhmed wrth <br />mcchamcrd xndRn chcmiad cunuol techniques 4 smglc control suute~ry, such as mnwme or a hrrhrcrdr, <br />usually is not sufliciem <br />Russran knapwrrd typrc:dly imadrs degraded areas. dominating the plant cnmmunin and dksirnble plants <br />to g perennial grasses! Seeding competitive. perennial grass species (cultural contn+l l nRrr Russran <br />knapwes:d has hero suresscd by ruhrr control measures (set-up vcatmentsl rs essential Set-up treatments <br />ntav mtludr c:hcmical ur mt~chanical mcth<ds. <br />Cuoprrauve research between Colorado Smtc Unn~crsrty and thr Cmvcrstlv of Wyonung showed thm <br />chenucal set-up treatment. were superior to mooing Cattail (ch+peralid + Z;1-D1. Es.:ntt ImMSUllirmnl, <br />and Roundup IgIYPhosatc) wire u!ced !o suppn~ss Russian knaptcrrd 73trn prrcromnl grasses were sown m <br />late fall m a donnmtl actiding Tillage a neeeswry to uvrrome the residual ellclopathit efli'tts of Russi,m <br />knapweed Curtml 1.3 quarts per acre) I •~ 1 ur Lston I I rwncr,.A) were apphrJ at dre bud-growth stage <br />Roundup was applied twits at I quart:'A, lust at the bud-growth stage and again about R weeks later <br />t'unnil tnntrallyd Russian kntyrwrexl hest, but Roundup failed to control it <br />None of the herbicides urjund sttdcd grosses Grusxs csuddishcd snnilarly among hrrhr.idr suppression <br />uraunenls, corn though Russian knapwend control varied I louever, whac L•ir;utt or Roundup was used to <br />wpprrss Russran knapwerd nddititmnl herhicide treatments wtwld he ncc~'ssary u, achieve arceptehle <br />umtrol <br />N' hilt two muwings, right weeks apart f hest at hod-gnnwh stage), suppressed Russran knapwerd dunng <br />that year, the weed recrsrred tiguuxtsh the suhxtprent season Pcrennitd grasses rstabhshcJ m dtc <br />motvinu trcaunent<but much less than m herhicide treatments l~ar, mowings per year t2rr several years <br />may wnvol Russian knapwecd hence, but fLrthcr research is needed w test dos hypothesis Curtrndy, nu <br />biolugrral wntn,l is ava!labir tier this weed <br />Russia~;t knapwerd <br />