1996). Musk thistle grows in all soil textures, but the soils must be well-drained (Butterfield et al. Combining control methods is the best form of Canada thistle management. It is a biennial weed, although occasionally it is an annual. ... Colorado State University Extension. Please use our website feedback form. Colorado 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). Use all chemicals according to the manufacturer's label. Crowds out native species and forage for livestock (Zouhar 2002) Skip to main content. It is becoming an increasing problem throughout Colorado. California; Colorado; Iowa; Illinois; Kansas; Kentucky; Louisiana; Missouri; North Apply these herbicides in spring or fall to musk thistle rosettes. Purple musk thistle (carduus nutans) in Colorado. 2. Chemical control. Colorado State University, U.S. Department of Agriculture, and Colorado counties cooperating. All seedlings grow into rosettes and overwinter in that stage. Apply Escort or Telar up to the early flower growth stage. Governing legislation for the pest district comes from Colorado Revised Statutes 35-5-(101-123) and Colorado Revised Statutes 35-5.5-(101-109). Escort (metsulfuron) or Cimarron X-tra (metsulfuron + chlorsulfuron) also can be used in pastures, rangeland, and non-crop areas. The latest time to apply these herbicides is when developed terminal flowers have opened up to the size of a dime. Musk thistle is a biennial weed that reproduces only from seed. With such abundant water throughout Southwest Colorado this year, invasive plants are thriving. Over 46,000 acres are infested with musk thistle in Colorado (Figure 2). Duty to control weeds. Weld County Field Guide - Thistles The pictures below are only for providing identifying features of the most misidentified noxious weeds in Weld County. The key to successful musk thistle control is to prevent seed production. Germination of seed and emergence of seedlings can occur anytime and are correlated with light and moisture. Before you take any action, be sure you have Canada and/or musk thistle. The Colorado Department of Agriculture has established a weevil, Trichosirocalus horridus. Conservation Services. Musk can be mechanically controlled with a shovel. 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. Musk thistle is an ever-increasing problem in Colorado. Musk thistle flowers (Figure 6) and starts to produce seed 45 to 55 days after it bolts. Optimum germination will take place in moist soil https://www.fs.fed.us/database/feis/plants/forb/carnut/all.html Musk thistle is a prolific seed producer. Musk thistle is found across most of North America. 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. Combine control methods into a management system for best results.Musk thistle is a… It is difficult to control because its extensive root system allows it to recover from control attempts. Tall thistle is often found in drainage ditches and wetland areas and not in pastures. It reproduces/spreads from seed. Equal Opportunity | This allows the weevils to complete their life cycle and ensures their presence in subsequent growing seasons. This weevil attacks the crown area of musk thistle rosettes and kills or weakens the plant before it bolts. 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 … The stems are commonly winged with spiny leaf tissue. 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) Our physical location is 1311 College Ave, Fort Collins, CO. Having website issues? Thus, musk thistle sets seed over an extended time period. 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. Gather and burn mowed debris to destroy any seed that has developed. The terminal, or tallest, shoots flower first, then lateral shoots develop in leaf axils. Seedling emergence also can occur in fall. CSU Extension programs are available to all without discrimination. The key to successful musk thistle control is to prevent seed production. I am literally watching the clock all morning, thinking about the amazing meal that I will be eating for lunch. 3. Musk thistle is primarily a biennial or winter annual species. Combine control methods into a management system for best results. Habitat Musk thistle is found in any type of habitat but normally establishes quickly in disturbed areas dominated by annual plants such as cheatgrass. Cultural control. The link to the Colorado Department of Agriculture noxious weed program will help you with identification. Musk thistle is an invasive species.
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