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Page 10 uf''3 <br />Rnssinn knapwecd <br />~~lunat;cmcnt <br />Appc•tulix [ <br />Like other ers~~pmg {x rennials the key to Russian knnpwerd crmtrol is to stress the weed and cause n to <br />expend nutnrnt .cures m tts root syslcm An intrgrnted mutagcmc•m plan should he dcvelo{x~ thal places <br />continuo) stress on the weed ('urrendv, the best managemem plan includes culhual control combmai with <br />mcchamcrd undirx ehcmical umtad techniyuca A single control strategy, such as mowing or a hcrhtcrdr, <br />usually is not sullicirnt <br />Rtrestan knapwraKl typically invades degraded arr:u, dorninattng the plant community and desirable plants <br />(e g. perennud grosses) Seeding wmpetihve, perennial grass species Iculturnl control I after Russmn <br />knapwecd has peen stressed M other comae) mrastues (xK-up treatments) is rsscnual Setup uratmatts <br />may include chrnucal ur mechanical mciheds <br />('cxrperauve research between ('oloradu State University and the I!nivvYSUp of 1~'yammg showed that <br />chcmrwl set-up treatments war supcnur u+ mowing Cunail (clopyralid - 3.~i•U), F.scurt (mrtsulfuronl. <br />and Rrxmdup fglyphosatr) wcrc usai u, suppress Russrm knapweecl 'll+rn perennial gtasxs were sown in <br />Iatr t;dl us a dormant sercling Pillage is necessary w overcome the residual allrlc>F+adtic eRixn of Russian <br />knapwccd Cunail (; yuanx per acre) (AI or fscun (l rwmec~:1) weer applied ni the hod-growth stage <br />Rcwndup was appGcd twice :n I qumV A, first at the hod-Krowrh stage and again abort R weeks Imrr <br />C'unad cunlnrlluJ Russian knnpwrc~i hest. hui Roundup furled to control it <br />None ol'Ihc hi'rbicrdrs injured seeded grasxs Grasses tstahbshed srmilarfy among herbicide suppression <br />treatmsmts, corn thcxrgh Russian knapwrcd conunl varied However, where Eswrt or Roundup was used to <br />suppress Rusinn krrapwccxl, addirinnal hcrhrade treatments wcnrld be necessary u+achrevr ucccptahlc <br />control <br />While two mowings. right wcxks opera (first al hod-gruw7h stage). wpprr_ssed Russian knnpwccd during <br />that vrar, the weed rranrred ciguruuslY the suhx~yurnt sraxm I'rrrnntal grasses established in the <br />mowing tmnhncnts but rnuch Irss than m herbrade traumrms Two mowurgs per year fix several vrars <br />may control Russian knapwrrd hence. lnu lurther research a nceded to test this hypsrthests Currrnlly. nu <br />bmkxtical control isacuilahlr for this weed <br />