The seed head weevil reduces seed production by 50 percent on the average. 1996) It occurs on soils with a pH range of 6.0 to 8.9 (Butterfield et al. While Canadian and musk thistle, mullen and even spotted knapweed provide gorgeous colors dotting the landscape, I can’t help but cringe every time I see a … In the first year, it germinates from seed and grows into a low-growing rosette of leaves. Musk thistle is commonly found in pastures, roadsides, and waste places. Create . Musk thistle is a large, spiny biennial with rose-purple flower heads up to 2½ inches wide. Providing trusted, practical education to help you solve problems, develop skills and build a better future. It is difficult to control because its extensive root system allows it to recover from control attempts. Habitat Musk thistle is found in any type of habitat but normally establishes quickly in disturbed areas dominated by annual plants such as cheatgrass. Tordon 22K (picloram), Milestone (aminopyralid), Transline (clopyralid), Perspective (aminocyclopyrachlor + chlorsulfuron), Banvel/Vanquish/Clarity (dicamba), 2,4-D, or Banvel/Vanquish/Clarity plus 2,4-D are commonly used. Fertilize only when necessary and according to soil testing recommendations. Musk thistle flowers over a seven- to nine-week period. Each thistle plant can produce 10,000 up to 120,000 seeds. Privacy Statement | Germination and seedling establishment are correlated with moisture and light. * Colorado State University Extension weed science specialist and professor, bioagricultural sciences and pest management. Before you take any action, be sure you have Canada and/or musk thistle. Musk thistle is a prolific seed producer. Conservation Services. Webmaster | The key to successful musk thistle control is to prevent seed production. Equal Opportunity | California; Colorado; Iowa; Illinois; Kansas; Kentucky; Louisiana; Missouri; North Optimum germination will take place in moist soil It is a biennial weed, although occasionally it is an annual. Duty to control weeds. The plant forms basal rosettes during its first year, which have deeply lobed leaves that are up to 10 inches long and 4 inches wide, … However, only one-third of the seeds are viable. It was first recorded in the United States in 1852 at Harrisburg, PA. The stem is cottony/hairy. Over 46,000 acres are infested with musk thistle in Colorado (Figure 2). Learn more about us or about our partners. Less than 5 percent of seed remains attached to the pappus when it breaks off the flowering head and floats away on wind currents. It invades many types of habitats but is a serious threat to pastures as it is unpalatable to livestock. If used alone, however, it is not an effective management tool. Musk thistle has sharply spiny stems and leaves. Musk thistle. Early in spring of the second year, overwintered rosettes resume growth. The leaves are dark green, coarsely bipinnately lobed, with a smooth, waxy surface and sharp yellow-brown to whitish spines at the tips of the lobes. CSU Extension programs are available to all without discrimination. Because musk thistle reproduces solely from seed, the key for successful management is to prevent seed production. Cultural methods that favor desirable plant growth can be combined with chemical or biological control by superimposing proper grazing management and seeding. It reproduces/spreads from seed. 700 Jefferson County Parkway, Suite 100 Golden CO 80401, Holiday Closure - County Offices Closing Starting at Noon Dec. 24-25, Coronavirus/COVID-19 Updates and Resources, Rosettes formed the first year and bolt early in May to June of the next year, Grows in all soil textures, but soils must be well drained, Musk thistle out-competes desirable plants for resources, Pastures, rangeland, forests, disturbed areas, right-of-ways, ditch banks and grain fields from sea level to 8,000 feet, Leaves are hairless, dark green with light green mid-rib, deeply lobed; 1  to 1 1/2 inches wide and 4 to 5 inches long; yellow to white spine near tip, Leaves extend onto the stem, giving it a winged appearance, Buds 1 inch or less wide; mature flowers are 1 1/2 to 3 inches wide, Droop from stem, giving it the name "nodding thistle", Each head produces an average of 1,200 to 1,500 seeds 45 to 55 days after bolting, Seed is dispersed 7 to 10 days after flowering, Can germinate 6 to 8 weeks after falling to ground, May remain dormant in soil for more than 10 years, Rosettes can grow up to 4 feet in diameter, Removal – hand pulling before seed set; remove at least the top 2 to 4 inches of the root, Burning - Fire has not been and effective control because it doesn’t get hot enough to kill the plant and its roots. Weld County Field Guide - Thistles The pictures below are only for providing identifying features of the most misidentified noxious weeds in Weld County. Musk thistle is found across most of North America. This weevil attacks the crown area of musk thistle rosettes and kills or weakens the plant before it bolts. With such abundant water throughout Southwest Colorado this year, invasive plants are thriving. To successfully manage musk thistle, prevent seed formation. Under CRS 35-5-102. The first documented report of musk thistle in Kansas was from a collection made in Washington County inI 1932. Make social videos in an instant: use custom templates to tell the right story for your business. 2. Seedling emergence also can occur in fall. Plants may resprout. Musk thistle has been reported in nearly every county in Kansas and is found primarily in pastures, rangeland, hay meadows, alfalfa, fallow, roadsides, and waste areas. #Colorado #Plant #Thistle … Musk Thistle may be found in pastures, rangeland, forests, disturbed areas, right-of-ways, ditch banks and grain fields from sea level to 8,000 feet. Musk thistle rosette Musk thistle will not tolerate tillage and can be removed easily by severing its root below ground with a shovel or hoe. This leads to a clumped pattern of seedling development and results in intraspecific competition and mortality. Apply herbicides such as Tordon, Milestone, Transline, Perspective, Vanquish/Clarity or 2,4-D to musk thistle rosettes in spring or fall. Wherever you live, Extension’s job is to determine what issues, concerns and needs are unique to each community, and offer sound and effective solutions. Colorado Weed Management Association. Musk thistle is a biennial, which means it lives only two years. ... Colorado State University Extension. Maintaining pastures and rangeland in good condition is a primary factor for musk thistle management. Or use herbicides in areas that aren’t sensitive to their use and biological control in areas where herbicides are impractical or environmentally unsafe. Thought to be Colorado’s rarest thistle Central mountains of Colorado (Eagle, Grand, Gunnison, Lake, Park, Pitkin, and Summit counties) Grows in mixed-conifer forests and meadows; 10,000-13,000 feet in elevation Duration: Perennial Compared to other thistles, leaves are thinner, flatter, and less Burning may improve grass growth, encouraging competition, Grazing - Ineffective because livestock only eat a few flowers. CSU Horticulture Agents and Specialists Blog, Capric Acid: A Promising Next-Generation Herbicide for Organic Specialty Crop Production, Columnar and Fastigiate Trees for CO Landscapes, Management-intensive Grazing (MiG) on Irrigated Pasture, Pulse Crops and their Key Role as Staple Foods in Healthful Eating Patterns, Integrated Hive Management for Colorado Beekeepers, Management-intensive Grazing (MiG) and Soil Health, Spring at rosette growth stage; or in fall, Use higher rates for older or dense stands, Use higher rate for older or dense stands; may be used to edge ponds or streams, Spring at rosette to early bolting growth stages; or in fall, Use higher rate for older or dense stands, Spring rosette to early bud growth stages; or to fall rosettes, Spring to rosette to early bud growth stages; or to fall rosettes. To North America from southern Europe and western Asia in the early 19th century below are for. Take any action, be sure you have Canada and/or musk thistle control to... 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