Laserfiche WebLink
incrcnse, most notably the dominant western svheatgnss Iagru~n rue smkAir},which incrc;+scd Flom G.0°.'0 <br />cover in 1998 to 17.0°.ti court in 2tN) I .Cover ofnon-noxious I'orbs declined over the course of the study <br />(from 8.0°'o in 1998 to 10°o in ?001), mostly due to reduced cover of ycllowssveetclover (:tleliLnus <br />n•(jrcinulia), which txmtrihuted ri.0°a absolute court in 1998 and L0°'o absolute cover in 2001. lbtal <br />vegetntion cover appears to have stabilised at around 50°0. <br />(-t)\(Ll~lOW ~\Ultl-('f)vlxtl\hvllf)\ti <br />Refer¢nce_ Arcn Nn. I end Adjacent Reclaimetl Flat Areas in Sutev Pile Vicinirv <br />CUNCLUSIO~ti <br />• Control program objective appears to have been met. Within the sampled reference area, density of <br />noxious weeds declined by over 8t;'• behvcen 1998 and 2001. <br />• A satisfactory vcgruttion cover has developed, dominated by perennial grasses. <br />• Perennial torb cover declined significantly between 1998 and 2001, but a number of desirnblcforb <br />species arc present in the stand, at low levels. <br />• 71tc biennials plumrlrss thistle and houndstongur are the prim:vy noxious species remaining in the <br />stand, although at much lower levels than prior to initiation of control. A sparse scattering of Canada <br />thistle punts remain, ai a les'e! not detected by ~uver s:unplirg. <br />REC.'OM ~>1 F.\' I):\'1'105 <br />• Suspend formal monitoring antes condiuons change. Prr(orm informal ci.ual recnnnaiss:mce <br />monitoring Irate Mny~rarly Junc cash year. <br />• Suspend chemical convol with the exception of fall spot spraying of defined patchos of Canada thistle <br />noted during annual visual rcconnaissnnce. <br />• Consider continued mechanical control to prevent sccd production of remnant noxious plants by <br />chopping with sccd whip or other approprintc hand tools annually in lair Junercarly July, possibly as <br />parr of aft organized group activity. <br />• Document control efforts annually. <br />Itrt~renrc :1+c.. \~, ~ and Ady~cent Sutev Pilc Slope tress <br />CO\'CLI slu\~ <br />the noxious weed reduction objective of the convol program appears to have been met. 13'ithin the <br />sampled reference azra, noxious weed densih declined h}' appmxitnately 75°o between 1998 and <br />2001 Most of the decline appears to reflect reduction of the initially dominantplumeless thistle and <br />other biennial species. with minimal impact to Canada thistle. <br />Several noxious species, including the perennial Canada thistle, and the bienninlsptumeless thistle, <br />bull thistle, and houndstongue maintain a significant presence in the stand. <br />