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Musk Thistle, or Nodding Thistle: Carduus nutans ... Musk thistle is similar in growth habit and appearance to Bull Thistle (Cirsium vulgare), however bull thistle has many hairs on the upper surface of the leaf blades unlike musk thistle which mostly lacks hairs.
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www.ppws.vt.edu/scott/weed_id/carnu.htm
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Because musk thistle is unpalatable to wildlife and livestock, selective grazing leads to severe degradation of native meadows and grasslands as wildlife focus their foraging on native plants, giving musk thistle a competitive advantage.
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www.nps.gov/plants/alien/fact/canu1.htm
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Musk thistle - Wikipedia, the free encyclopedia
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The Musk thistle or Nodding thistle ( Carduus nutans ) is a member of the sunflower family Asteraceae. It is a biennial herb with showy red-purple flowers and sharply spiny stems and leaves. It ...
en.wikipedia.org/wiki/Musk_thistle
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A species profile for Musk Thistle from USDA's National Invasive Species Information Center. ... Carduus nutans L. (Musk Thistle) - Noxious and Nuisance Plant Management Information System (PMIS); United States Army Corps of Engineers. Engineer Research and Development Center. Environmental Laboratory.;
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www.invasivespeciesinfo.gov/plants/muskthistle.shtml
www.invasivespeciesinfo.gov/plants/muskthistle.shtml
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Musk thistle is primarily a biennial or winter annual but may occur as a summer annual. The leaves of musk thistle are deeply lobed, hairless, and are dark green with a light green mid-rib. A silver gray leaf margin is characteristic of each spine tipped lobe.
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www.ksda.gov/plant_protection/content/349/cid/587
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Musk thistle is commonly found in pastures, roadsides, and waste places. It prefers moist, bottom land soil, but can be found on drier uplands, also. It is becoming an increasing problem throughout Colorado, particularly along the Front Range...
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www.cwma.org/nx_plants/mt.htm
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Bio-Controls: One insect control agent for musk thistle is the seed head weevil (Rhinocyllus conicus), which is well distributed in the county and spreads on its own. The larval stage of this weevil devours most of the seeds in a head that it infests.
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www.colostate.edu/Depts/CoopExt/Adams/weed/msthistle_mg...
www.colostate.edu/Depts/CoopExt/Adams/weed/msthistle_mgt.htm
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Musk thistle was introduced into the United States from Europe. This plant is considered a noxious weed and is included on the Colorado and the Adams County Noxious Weed Lists. Musk thistle is a biennial, which means its first year of growth is a rosette from a stout, corky taproot.
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www.colostate.edu/Depts/CoopExt/Adams/weed/musk_thistle...
www.colostate.edu/Depts/CoopExt/Adams/weed/musk_thistle_id.htm
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Musk thistle, Carduus nutans L., is an invasive weed that has become widespread in the contiguous states of the United States. It is a highly competitive weed of Eurasian origin that has replaced much of the native vegetation in pastures and disturbed areas (Surles et al., 1974;
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www.invasive.org/eastern/biocontrol/18MuskThistle.html
www.invasive.org/eastern/biocontrol/18MuskThistle.html
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