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Russian Knapweed Identification and Management <br /> that can grow to become independent <br /> plants.Once rosettes emerge in the <br /> r spring,remaining root buds slough-off <br /> until they develop again in late summer. <br /> Additionally,root fragments can <br /> develop into new plants. <br /> r ' Russian knapweed is allelopathic, <br /> which means it contains a toxic <br /> 0 Steve Dewey USU <br /> substance that inhibits the growth of <br /> competing plants.This weed may also <br /> be toxic to horses resulting in serious <br /> injury or possibly death of the animal. <br /> Russian knapweed displaces native = . <br /> _ vegetation and reduces forage values <br /> on range and pasturelands. <br /> Russian knapweed(Acroptilon <br /> repens)is a non-native,deep-rooted u abitat for Russian knapweed <br /> perennial that spreads by aggressive, 1 t includes roadsides,ditch banks, <br /> creeping,horizontal roots(rhizomes) riparian zones,pastures,rangeland, Black,scaly root (Vn' <br /> and seeds.The roots are brown to saline soils,clear cuts,and cropland. ItR^" <br /> black with a scaly appearance. Russian typically invades degraded areas and <br /> knapweed can grow up to 3 feet in sites with full sun. k* Cap <br /> height.The stems and leaves are <br /> covered with short gray hairs.The The most effective method of control 0 <br /> flowers are urn-shaped,pink to purple for Russian knapweed is to prevent <br /> in color,and are solitary at the tips of its establishment through proper O <br /> the upper branches. Russian knapweed land management. Maintain healthy <br /> pastures and rangeland and continually <br /> can be distinguished from other ., <br /> knapweeds by the smooth,papery, monitor your property for new ,, .� °Fk ----. <br /> rounded bracts that surround the infestations. If Russian knapweed is <br /> already established,using an integrated <br /> flowers. Russian knapweed emerges ..� <br /> roves toroach management a p <br /> d manag pp _ <br /> in early spring after soil temperatures wee fp <br /> be effective. Russian knapweed can be <br /> remain above freezing. It produces , <br /> flowers from June to August and sets managed with herbicides or biocontrol <br /> insects,but long-term control must <br /> seed in late summer to early fall.The <br /> `r ears. include planting competitive plant Q <br /> tn� <br /> seeds are viable for two to three y species to occupy bare ground once <br /> Russian knapweed reproduces primarily infested by the weed. Details on the <br /> from its root system. Buds on the back of this sheet can help to create a <br /> horizontal roots can form adventitious management plan compatible with your <br /> shoots,August through the winter, site ecology. <br /> Key ID Points <br /> 2008 Quarter Quad Survey Russian knapweed is <br /> Russian knapweed =A> �:s °r•r> » «Z. •lntftt=dAens designated as a "List 1. Distincluished <br /> ar:bac,veawv..x< <br /> amprironiepms B" species in the Colorado from other <br /> Q <br /> Noxious Weed Act. It knapweeds by <br /> is required to be either theflower's <br /> eliminated, contained, or smooth, <br /> bracts. <br /> suppressed depending on <br /> the local infestations. For Roots <br /> more information, visit brown to black <br /> www.colorado.gov/ag/ with <br /> weeds and click on the appearance. <br /> Noxious Weed Program 3. Rosettes - • <br /> link or call the State lower <br /> Weed Coordinator at the deeply <br /> Colorado Department of 4. Upper leaves <br /> Agriculture, Conservationsmooth <br /> Services Division, margined, and <br /> 303-869-9030. notlobed. <br /> AC-9*estbrp is supywed by courtly waed supervk M Wd a 01ed by pie Waradn DWrMent Of A9rkL1V c <br />