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Russian Knapweed Identification and Management <br /> that can grow to become independent <br /> plants.Once rosettes emerge in the <br /> 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 /> ussian knapweed is allelopathic, <br /> 1 \which means it contains a toxic <br /> e' - MQse� exs« <br /> substance that inhibits the growth of <br /> ,, r N competing plants.This weed may also <br /> r „ _ 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 ,y <br /> repens)is a non-native,deep-rooted u abitat for Russian knapweed <br /> perennial that spreads by aggressive, 1 1 includes roadsides,ditch banks, <br /> creeping,horizontal roots(rhizomes) riparian zones,pastures,rangeland, <br /> and seeds.The roots are brown to saline soils,clear cuts,and cropland. It <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. 'r o' f <br /> height.The stems and leaves are he most effective of Control <br /> covered with short gray hairs.The ve me con <br /> flowers are urn-shaped,pink to purple <br /> Tor Russian knapweed is to prevent <br /> in color,and are solitary at the tips of its establishment through proper ' <br /> the upper branches. Russian knapweed land management. Maintain healthy ,+ <br /> can be distinguished from other pastures and rangeland and continually ry, <br /> knapweeds by the smooth,papery, monitor your property for new <br /> rounded bracts that surround the infestations. If Russian knapweed is O <br /> flowers. Russian knapweed emerges already established,using an integrated <br /> in early spring after soil temperatures weed management approach proves to <br /> remain above freezing. It produces be effective. Russian knapweed can be ga <br /> managed with herbicides or biocontrol <br /> flowers from June to August and sets <br /> C@ <br /> seed in late summer to early fall.The insects,but long-term control must <br /> include planting competitive plant <br /> V�i <br /> seeds are viable for two to three years. p g p p w ; <br /> 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 <br /> shoots,August through the winter, management plan compatible with your �1 <br /> site ecology. <br /> PointsKey ID <br /> 2008 Quarter Quad Survey [^� ussian knapweed is n <br /> Russian knapweed n wre ti ,sx,,es.mie:iedA— 1 `designated as a `List � _ -. <br /> Acropt+bn rppens Dni „ <br /> B species in the Colorado from otherQ <br /> Noxious Weed Act. It knapweeds by <br /> is required to be either the flower's <br /> eliminated, contained, or smooth,papery <br /> suppressed depending on <br /> the local infestations. For 2. Roots <br /> more information, visit brown to black <br /> www.colorado.gov/ag/ with scaly <br /> weeds and click on the <br /> Noxious Weed Program 3. Rosettes and <br /> link or call the State lower <br /> Weed Coordinator at the deeply lobed. <br /> Colorado Department of 4. Upper <br /> Agriculture, Conservation smaller, smooth <br /> Services Division, margined, - • <br /> 303-869-9030. notlobed. <br /> Dlsv�buUop l•q•na: a .v�soe i-5 e.x-5�-.�-xi-iaop�..e...•:^t. <br /> A—V esrinaes-ppW by ce 4,rKee"p—i and ebn pW by me C•bnEp Cep enn of Ag,w,u <br />