Spear thistle Scientific name: ... Atlantis Aquifer Invasive Plant Control. 19. Other pests Latin Name: Cirsium vulgare. SPEAR THISTLE. Spear thistle’s form of defence is the most aggressive in Finland: strong, needle-sharp spines on both the leaf-blade margins and along the winged stem, the capitula’s involucral bracts end with a sting and even the surface of the leaves is covered in delicate spines. Eliminating seed production is the most effective mechanical control technique. Long-term control is possible from herbicide treatment; spear thistle is susceptible to clopyralid* and moderately susceptible to MCPA* herbicides. Illyrian thistle is an erect annual or biennial herb 1.5 to 2 m high. Agriculture, Ecosystems and Environment, 37(1-3):199-205 Control spear thistle by digging them out or destroying the rosette when the plants are young and the soil is damp. This method is not effective with creeping thistle since it tends to propagate through its roots rather than its seeds: fragments of root (rhizome) left in the soil after pulling/digging can remain dormant for Where clover is an important constituent of the sward, a mixture of MCPA* and MCPB* herbicides is more appropriate. The flowers can range from yellow to orange-yellow, and are surrounded by thin spiny offshoots that can grow up to 5 cm long. The Control of Scotch/Spear Thistle (Cirsium vulgare) This biannual can infest new seeds, pastures, crop margins and fencelines. 19:5. Spear thistle control methods. At rates required for high levels of control they usually cause some damage to clovers and medics but are safe in tillering wheat and barley crops. Spear thistle Print page . and Milk thistle (Silybum) are less common but visually retain a lot of the same characteristics. Glyphosate at 0.5% provides effective control of seedling and adult plants, alternatively spot spray Lontrel® 6 ml/10 L (300 ml/ha) + wetting agent, from rosette stage to early flowering. nutrients. Although it is intimidating in appearance and can sometimes form large infestations, this thistle is not as challenging to control as many others and is mainly a problem in hay fields and pastures. We once calculated that nearly a third of a 6.5 acre pasture was covered in rosettes. Mature plants are normally 30-50 cm tall, with flowers from July through to late autumn. Read the manufacturers’ labels and material safety data sheets before using herbicides. Category: Turf Weeds. The flowers are purple in colour and made up of many little florets (tiny flowers), with spines on the stem and leaves. Canada thistle is a perennial weed that has soft green, deeply lobed, spear-like leaves and these leaves have sharp barbs on them. Spear thistle control . Leaf margins of scotch thistle are cut or toothed, spiny and undulating. A widespread and common thistle, the Spear thistle can be found on disturbed and cultivated ground, such as pastures, roadside verges and field edges from July to October. SAFFRON THISTLE. The weed competes effectively with crops for water, light and nutrients. Bull thistle is a widespread biennial thistle originally from Europe and Asia, but now introduced throughout North America. Once established, it can be difficult to eradicate permanently. Some fields retain a large seed-bank, and surprising proportions of land can be covered by the plant after reseeding. Leaves are obovate to lanceolate (spear-like), to 30 cm long and toothed to deeply lobed with spiny margins. Thistle control options. Once controlled in the re-seed, it is rarely a problem in grazed fields except after poaching or other sward damage. The biological control of Cirsium vulgare (Savi) Tenore in South Africa has been a recent oppor- tunistic project using insects … It is biennial and only spreads by seed. Flowers: Purple, flat topped flowers from July to … Adult thistles were cut in 4 m2 plots on 4 different dates (Jun.-Aug.). Although thistles attract pollinators and birds, the spiny leaves and stems keep grazers away. - Milk, Sow, Spear, Scotch, Creeping Thistle. Blanket wipers or wick applicators using 50% glyphosate can provide some selective control. Agric. Scotch thistle (Onopordum acanthium), sow thistle (Sonchus spp.) Thistlex ® is a very effective translocated product for both creeping and spear thistle. Its classic thistle appearance - purple, fluffy-looking flowers sitting atop a spiny ball - may well … Areas in need of Thistle Weed Control. seedling survival, growth, flowering and seed production in bull thistle. It is unclear whether fire will completely kill bull thistle. 2,4-D amine is the most cost effective of the hormone herbicides for Saffron Thistle control. 2,4-D and MCPA have been used for many years and are most effective on plants up to budding. A WEED REPORT from the book Weed Control in Natural Areas in the Western United States Bull thistle . In: Van Driesche, R., et al., 2002, Biological Control of Invasive Plants in the Eastern United States, USDA Forest Service Publication FHTET-2002-04, 413 p. Pest Status of Weed. Thistles need controlling because they: • compete with grass for space, light, nutrients and water • are unpalatable to stock The best general control of Spear Thistles is obtained by encouraging competition from useful plants. The Weeds Act 1959 (7 & 8 Eliz.II c. 54) is an Act of the Parliament of the United Kingdom regarding the control of five injurious native weed species throughout the UK. What to Control. Spear thistle only spreads by seed. It has the same whitish-grey, woolly appearance as Scotch thistle (O. acanthium). Plant Protection News, No. Cirsium vulgare, the spear thistle, bull thistle, or common thistle, is a species of the Asteraceae genus Cirsium, native throughout most of Europe (north to 66°N, locally 68°N), Western Asia (east to the Yenisei Valley), and northwestern Africa (Atlas Mountains). Lifecycle: Perennial. Control. Zimmermann HG, 1990. If allowed to go to flower, the flower is a purple pom-pom shape that will be produced in clusters at the top of the plant. It received Royal Assent on 16 July 1959, and aims to prevent the spread of the Broad Leaved Dock, Common Ragwort, Creeping Thistle, Curled Dock and the Spear Thistle. Spear thistle, bank thistle, bird thistle, black thistle, blue thistle, boar thistle, bull thistle, bur thistle, button thistle, common bull thistle, common thistle, Fuller's thistle, green thistle, plume thistle, roadside thistle, Scotch thistle, swamp thistle. 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