Laserfiche WebLink
ImiLRangeland,pasture,and riparian site recommendations <br /> Colorado Department of Yellow starthistle <br /> Agriculture Identification and Management <br /> 305 Interlocken Pkwy y <br /> Broomfield,CO80021 �I� A yellow starthistle is fatally poisonous <br /> (303)869-9030 ` + 1 to horses (causing chewing disease) <br /> weeds@state.co.us �' and is considered poor forage for all <br /> V.4, livestock and wildlife. It also destroys <br /> P !„ native plant communities. The seed <br /> bank of yellow starthistle is not <br /> �� , •'+ � completely understood. The site must <br /> •�.� x be monitored for at least 15 years after <br /> the last flowering adult plants have been <br /> V "` ��•. eliminated and treatments repeated <br /> Identification and When necessary. <br /> Impacts he key to effective control of <br /> Tyellow starthistle is to prevent <br /> Yellow starthistle (Centaurea <br /> seed set from occurring in existing <br /> populations,monitoring your land for <br /> .�{T=: solstltlalis�originated from <br /> � new infestations frequently, treating <br /> Northern Spain.It is a winter annual <br /> newly detected invasions rapidly,and <br /> . that is blue-green in color,has a <br /> f vigorous taproot,and produces bright Preventing new introductions from <br /> yellow Rowers with sharp,stiff spines occurring, Details on the back of this <br /> surrounding the base of the flower sheet can help to create a management <br /> that extend up to ;/a of an inch long. plan compatible with your site ecology. <br /> Yellow starthistle grows from 1 inch 0 <br /> all to 4 feet all. Basal leaves are 1-3 ellow starthistle is designated as a <br /> inches long and deeply lobed while Y"List A"species in the Colorado <br /> upper leaves are smaller and narrower. Noxious Weed Act. It is designated <br /> Stems appear winged and both stem for statewide eradication. For more `j <br /> O and leaves have a slight whitish nap information visit www.colorado.gov/ <br /> covering them.Yellow starthistle a weeds and click on the Noxious <br /> spreads by seed with a single large Weed Management Program.Or call <br /> plant producing up to 100,000 seeds. the State Weed Coordinator at the <br /> Plumed and plumeless seeds disperse Colorado Department of Agriculture, <br /> at different times. Conservation Services Division, 303- <br /> 239-4100. <br /> .� . Yellow starthistle typically <br /> germinates in the fall with <br /> increased moisture,overwinters Map of yellow starthistle infestation. <br /> as a seedling,and forms its rosette <br /> beginning in March through May.It <br /> can however,germinate extremely fast <br /> ' • with optimal conditions throughout <br /> the entire summer(16 hours or <br /> • less with — 70 degrees F and ample <br /> _ moisture).Flowering generally occurs <br /> • <br /> • from June to September and often <br /> later. <br /> • • abitats for yellow starthistle <br /> include rangelands,pastures, <br /> roadsides,wastelands,and lower Photos clockwise from lower left© (3 on left side) <br /> Updated on: elevations. Over utilized grasslands Kelly Uhing,Colorado Department of Agriculture,Steve <br /> 7 �13 Dewey,Utah State University,Bugwood.org;and map by <br /> are particularly susceptible to invasion. Crystal Andrews,Colorado Department of Agriculture. <br />