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Centaurea stoebe, the spotted knapweed or panicled knapweed, is a species of Centaurea native to eastern Europe. auct. Spotted knapweed is a serious threat to the rangelands of the western United States. Native Introduced Native and Introduced. Native To: Europe (Zouhar 2001) Habitat: Rangelands, disturbed areas, meadows, pastures, roadsides and sandy or gravelly floodplains. Note: when native and non-native Saint Paul, MN 55155-2538, Phone: 651-201-6000 Location in Nebraska. Spotted & Diffuse Knapweed Species Centaurea biebersteinii & Centaurea diffusa. Spotted & Diffuse Knapweed Centaurea biebersteinii, Centaurea diffusa. Spotted knapweed is a biennial or short-lived perennial herbaceous plant that grows two to three feet tall. Spotted knapweed infestations have been associated with reductions in forage production [60,220], plant species richness and diversity [203,205], cryptogam cover , soil fertility [65,136,231], and wildlife habitat , as well as increases in bare ground , surface water runoff, and stream sedimentation . To reuse an It also produces a chemical that is toxic to other plants, allowing it to spread quickly and become established. It is also an invasive species in the United States, and particularly widespread in dryer regions of the West, which has a similarly dry climate as the Mediterranean. measurable life history stages of spotted knapweed; seeds, seedlings, rosettes, and flowering plants. It is most common in sunny habitats with well-drained or gravelly soils. Infestations have also been shown to increase the erosion of topsoil, further altering the surrounding habitat and natural system. It was introduced into North America as a contaminant in alfalfa (Medicago sativa) in Victoria, British Columbia in 1883 (Sheley and Petroff 1999). Spotted Knapweed is one of 3 targeted plant species in Minnesota with an active bio-control program, the other 2 species are leafy spurge and purple loosestrife. Also covers those considered historical (not seen It can form dense cover in prairies, pastures, and open habitats. Spotted knapweed, flowers - USDA APHIS PPQ, Oxford, North Carolina. Spotted knapweed, Centaurea maculosa, was introduced to America via contaminated alfalfa and clover seed in the 1890s; it made its way to Canada in 1893. 3)Explain why some introduced species can become so invasive and damaging to native species and ecosystems. 1998). Brown knapweed is an invasive species on the Prohibited Eradicate List. 2006). 1) How it reproduce? Habitats in the eastern US include old fields, roadsides, and areas with open, sandy soils. Typically invading natural areas, pastures, forest and field margins, mining areas, and unmaintained gravel pits, it is also commonly found along roads, railways, and trails. micranthos (Gugler) Hayek (ITIS) Synonym: Centaurea biebersteinii DC., Centaurea maculosa auct. Pulling is easiest when soil is moist; allowing you … Spotted knapweed gets its name from the black-tipped spots on the bracts. How could spotted knapweed be spread through the province? Can you please help us? Invasive plant species such as spotted knapweed can degrade biological communities and threaten the survival of native species by consuming limited resources (Randall 1996). Spotted knapweed is more intolerant to dense shade and prefers moister habitats than diffuse knapweed; however, spotted knapweed is still a problem in forested areas disturbed by Habitat & Ecology. Additionally, no transportation, propagation, or sale of these plants is allowed. Habitat preferences: Found in fields, roadsides, and other open areas, from the plains to the mountains. Occurs in rangeland, meadows, roadsides, open and sandy soils. Spotted knapweed [Centaurea stoebeL. It is considered the “most problematic invasive species in North America” (Emery et al. Quick facts. Spotted knapweed threatens wildlife habitat and pastures because of its ability to quickly move from disturbed sites into relatively undisturbed, beneficial plant communities. Once established, spotted knapweed can form monotypic standsbecause its age class hierarchy allows it to occupy all available niches [173]. evidence (herbarium specimen, photograph). Description. Spotted knapweed thrives in exposed areas with well-drained soil. Leaf Shape: Rosette leaves deeply lobed, linear mature leaves. RI, 711 TTY, © Copyright 2021 Minnesota Department of Agriculture, Farm, Property, Real Estate Listing (MN FarmLink), Agriculture Chemical Response & Reimbursement Account, Agricultural Best Management Practices (AgBMP) Loan, Agricultural Growth, Research & Innovation (AGRI) Program, Sustainable Agriculture Demonstration (AGRI), More Business Development, Loans, Grants Topics, Minnesota Ag Water Quality Certification Program, Certified Testing Laboratories (soil & manure), Fertilizer Tonnage Reporting & Inspection Fees, Pesticide Dealer Licensing & Sales Reporting, local University of Minnesota extension agent, Spotted knapweed lifecycle and treatment timing graphic, Department of Natural Resources fact sheet. (ITIS) Common Name: Spotted knapweed. Failure to comply may result in enforcement action by the county or local municipality. decreased by 88% after the invasion of spotted knapweed (Watson … However, an evident pappus always crowns the ovary, 
and the marginal flowers of the capitulum are falsely radiant (pappus absent and marginal flowers not enlarged in measurable life history stages of spotted knapweed; seeds, seedlings, rosettes, and flowering plants. Habitat. Native Plant Trust or respective copyright holders. However, a single mowing at late bud stage growth can reduce the number of seeds produced. It prefers moister habitats than Diffuse knapweed, but is intolerant of constant moisture. It was probably introduced to North America from Europe as a contaminent in alfalfa seed or in ships' ballast. • Spotted Knapweed was formerly (or incorrectly) known as Centaurea biebersteinii and Centaurea maculosa. Non-native: introduced It is found along rivers and creeks in relatively dry disturbed sites. Habitat: Native to Eastern Europe, spotted knapweed is commonly found on well-drained, light to coarse textured soils, but is intolerant of dense shade. Plant must be destroyed and transportation, propagation, or sale of these plants is prohibited. in part by the National Science Foundation. C. stoebe L. ssp. State designated noxious weed. micranthos (Gugler) Hayek. They damage the efficiency and biodiversity of ecosystems through both direct (e.g. It forms deep taproots allowing it to capture moisture and nutrients and spreads rapidly, displacing native vegetation and reducing the forage potential for wildlife and livestock. Cattle and other animals avoid eating it so it can cause large reductions in available food for grazing animals. VT. Fields, railroads, open rights-of-way, 
sandy or gravelly banks. It is now a common weed of roadsides and pastures in Minnesota. in 20 years). 2021 Spotted knapweed gets its name from the black-tipped spots on the bracts. (Gugler) Hayek • Spotted knapweed decreases habitat for live- stock and deer and elk. Flowers are small, oval, pink to purple, produced at the end of branched stems and covered with stiff bracts marked with dark, upside-down “V” markings, giving them a spotted appearance. Common name(s): Spotted knapweed Scientific name: Centaurea stoebe Family: Sunflower or Aster family (Asteraceae) Reasons for concern: This plant is a prolific seed producer. Biological control insects are used to help manage this plant. Spotted knapweed has few natural enemies and is not preferred by livestock as forage. Habitat Top of page Spotted knapweed infests roadsides, waste areas, plains and dry rangelands and prefers well-drained, light-textured soils. This can be an effective tool in combination with other methods of control. S. Knapweed severely degrades the quality of habitats in which it becomes established. a sighting. micranthos Gugler All rights reserved. Spotted knapweed is found in artificial corridors such as gravel pits, railroad beds and field margins, and can spread to adjacent intact woodlands and prairies.

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