The key to successful musk thistle control is to prevent seed production. Musk thistle. Both Canada and musk thistle are on the Colorado Noxious Weed B list. Privacy Statement | It tends to be more effective than the seed head weevil. 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 … Apply these herbicides in spring or fall to musk thistle rosettes. ©2020, Colorado State University Extension, Fort Collins, Colorado 80523 USA. by K.G. Distribution: In Colorado, musk thistle is found up to approximately 10,000 feet in elevation (Beck 1999). Equal Opportunity | Conservation Services. 2. Musk thistle is commonly found in pastures, roadsides, and waste places. The stem is cottony/hairy. CSU Extension programs are available to all without discrimination. Musk thistle is a prolific seed producer. Combine control methods into a management system for best results. An official website of the United States government. This leads to a clumped pattern of seedling development and results in intraspecific competition and mortality. Musk thistle flowers over a seven- to nine-week period. 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. CSU A-Z Search Rosettes are usually large and compact with a large, corky taproot that is hollow near the crown (Figure 3). It is found throughout North America. My meals magically show up at my door at a convenient time with text messages to remind me that they are coming, close and have arrived. 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. OK-OSU Extension-Integrated Control of Musk Thistle (CANU4) OK-OSU Extension-Thistles and their Identification (CANU4) OK-Thistle in Alfalfa (CANU4) TX-Biological Control of Weeds in Texas (TAMU) (CANU4) The Nature Conservancy: Wildland Weeds Management & Research Program (CANU4) UT-Unwanted Weeds-Utah Department of Transportation (CANU4) Create . It is becoming an increasing problem throughout Colorado. Once established it spreads rapidly because of the large number of seeds produced. Navajo Lake Trail, August 30, 2007. Chemical control. Germination and seedling establishment are correlated with moisture and light. Colorado List B - Control required in Jefferson County. Certain herbicides or mowing can be combined with the seed head weevil if these are used during late flowering stages. Musk Thistle in Pagosa Springs, Co. 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, … That is, allow the control insects to complete their life cycle. Musk thistle is a prolific seed producer. California; Colorado; Iowa; Illinois; Kansas; Kentucky; Louisiana; Missouri; North Musk thistle is a prolific seed producer. The Conservation Services Division provides technical and financial support, leadership and statewide coordination, and regulatory oversight to public/private landowners and agricultural businesses statewide on an array of natural resource management challenges. This allows the weevils to complete their life cycle and ensures their presence in subsequent growing seasons. Mowing can effectively reduce seed output if plants are cut when the terminal head is in the late-flowering stage. Musk thistle is a noxious weed in all counties in Kansas. Employment | When I started noticing this weed blooming, I would take my camera on our walk. Heavy grazing and associated disturbances near water, salt and loafing areas increase establishment of seedlings, Mowing - Between the first appearance of pink on the earliest buds and brown on the pappus. 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. Found in 17 states at 49 Corps projects Click (number) to view projects per state. Several herbicides are registered in pasture, rangeland and noncrop areas to control musk thistle. Canada thistle is a creeping perennial that reproduces from vegetative buds in its root system and from seed. Apply Escort or Telar up to the early flower growth stage. Musk thistle has very large bracts beneath flowers that are armed with sharp spines and shoots beneath flowers are almost devoid of leaves. Each thistle plant can produce 10,000 up to 120,000 seeds. Governing legislation for the pest district comes from Colorado Revised Statutes 35-5-(101-123) and Colorado Revised Statutes 35-5.5-(101-109). The stems are commonly winged with spiny leaf tissue. 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. Our physical location is 1311 College Ave, Fort Collins, CO. Having website issues? The link to the Colorado Department of Agriculture noxious weed program will help you with identification. Crowds out native species and forage for livestock (Zouhar 2002) Skip to main content. Thus, more seeds germinate and establish plants in open pastures and other degraded areas. No specific recommendation or endorsement is made or implied by listing methods or products. Musk thistle will not tolerate tillage and can be removed easily by severing its root below ground with a shovel or hoe. Wind and water are good dissemination methods and seeds are also spread by animals, farm machinery and other vehicles. Musk thistle grows in all soil textures, but the soils must be well-drained (Butterfield et al. CSU Extension - A division of the Office of Engagement. Persistence is imperative so the weed is continually stressed, forcing it to exhaust root nutrient stores and eventually die.Canada thistle (Cir… Noxious Weed Information - Musk Thistle. Add a good agricultural surfactant at 0.25 percent v/v to Escort or Cimarron X-tra treatments or control is inadequate (equivalent to 1 quart of surfactant per 100 gallons of spray solution). Burning may improve grass growth, encouraging competition, Grazing - Ineffective because livestock only eat a few flowers. Musk thistle dies after it sets seed. While at the Last Resort RV park for the summer, every day I would walk the dog on a path along the river. Escort (metsulfuron) or Cimarron X-tra (metsulfuron + chlorsulfuron) also can be used in pastures, rangeland, and non-crop areas. The first documented report of musk thistle in Kansas was from a collection made in Washington County inI 1932. Musk thistle flowers (Figure 6) and starts to produce seed 45 to 55 days after it bolts. Apply herbicides such as Tordon, Milestone, Transline, Perspective, Vanquish/Clarity or 2,4-D to musk thistle rosettes in spring or fall. It can also be found in over-grazed sites, roadsides, and riparian areas. 1. Musk thistle is a biennial weed that reproduces only from seed. Although there are signs of regrowth, and some areas have been reseeded with native grasses, the natural plant succession in the burned pinyon-juniper forest is being disrupted by an invasion of aggressive, nonnative plant species such as musk thistle and cheatgrass. Thus, musk thistle sets seed over an extended time period. Musk thistle Flower Musk thistle infestation –2 to 10 feet tall Musk thistle rosette –notice white border on leaves Scotch thistle flower Scotch thistle infestation – 2 to 10 feet tall Purple musk thistle (carduus nutans) in Colorado. 1. Musk thistle. The terminal, or tallest, shoots flower first, then lateral shoots develop in leaf axils. Webmaster | Meadows, disturbed areas. The seed head weevil reduces seed production by 50 percent on the average. It is difficult to control because its extensive root system allows it to recover from control attempts. * Colorado State University Extension weed science specialist and professor, bioagricultural sciences and pest management. Musk thistle is an ever-increasing problem in Colorado. If used alone, however, it is not an effective management tool. Less than 5 percent of seed remains attached to the pappus when it breaks off the flowering head and floats away on wind currents. Musk thistle is continuous throughout the United States. Summer. Seedling emergence also can occur in fall. Colorado musk thistle. Because musk thistle reproduces solely from seed, the key for successful management is to prevent seed production. The musk thistle seed head weevil is not being redistributed anymore because it attacks many different species of thistles, including native thistles. It spends approximately 90 percent of its life cycle in a vegetative growth stage. Use all chemicals according to the manufacturer's label. To combine chemical and biological control methods, apply herbicides when they won’t interfere with insect development. 4. Before you take any action, be sure you have Canada and/or musk thistle. Duty to control weeds. - Acquista questa foto stock ed esplora foto simili in Adobe Stock This is a musk thistle. Musk thistle’s tolerance to most herbicides increases after it bolts. Tall thistle is generally no taller than musk thistle -- 5 to 7 feet tall. Early in spring of the second year, overwintered rosettes resume growth. Since this time is has become invasive across North America and is classified as a noxious weed in many states including Colorado. 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. 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Often found in drainage ditches and wetland areas and not in pastures, ditch banks along. ) will not tolerate tillage and can be removed easily by severing root. Is an invasive species.