Once controlled in the re-seed, it is rarely a problem in grazed fields except after poaching or other sward damage. 2,4-D amine is the most cost effective of the hormone herbicides for Saffron Thistle control. SPEAR THISTLE. Spear thistle (Cirsium vulgare) occurs widely on lowland and upland grassland and waste places. “Spear thistle rosette” by John Tann is licensed under CC BY 2.0 US Non-native thistles have become major problems in agricultural landscapes and 22 states have designated them as noxious weeds. - Milk, Sow, Spear, Scotch, Creeping Thistle. Spear thistle (Cirsium vulgare) occurs widely on lowland and upland grassland . It is very safe to grass. Leaves are obovate to lanceolate (spear-like), to 30 cm long and toothed to deeply lobed with spiny margins. Long-term control is possible from herbicide treatment; spear thistle is susceptible to clopyralid* and moderately susceptible to MCPA* herbicides. Bull thistle is a widespread biennial thistle originally from Europe and Asia, but now introduced throughout North America. Spear thistle control methods. Spear thistle has a relatively high content of copper (Salisbury, 1961). 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. Goldfinches and linnets feed on the seeds (Klinkhamer & de Jong, 1993, Moorcroft et al., 1997). The plants can be cut each year before mid-July to prevent shedding of viable seed. The biological control of Cirsium vulgare (Savi) Tenore in South Africa has been a recent oppor- tunistic project using insects … treatment later in the season to control any late shooting thistles. Upper leaf surface is dark green and rough while the … Scotch thistle is an erect annual or biennial herb growing to 2m high and reproducing by seed and root pieces. 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. Cut stems were removed from half of the treated plots but were left where they fell on remaining plots. Spear thistle control . The weed competes effectively with crops for water, light and . The Nature Conservancy Director of Water Funds for South Africa, Louise Stafford, is inviting invasive species teams, mentors and experts to submit proposals for an invasive species clearing project in Atlantis, Western Cape. A WEED REPORT from the book Weed Control in Natural Areas in the Western United States Bull thistle . Plant Protection News, No. ... Control is generally best … We once calculated that nearly a third of a 6.5 acre pasture was covered in rosettes. Its classic thistle appearance - purple, fluffy-looking flowers sitting atop a spiny ball - may well … Although thistles attract pollinators and birds, the spiny leaves and stems keep grazers away. Type of plant. nutrients. Scientific Name. Zimmermann HG, 1991. 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. The best general control of Spear Thistles is obtained by encouraging competition from useful plants. Areas in need of Thistle Weed Control. Thickets of thistle crowd out forage grasses in pastures and rangelands, reducing crop yields and productivity. Biology Spear thistle flowers in June and July but the leaf rosettes can survive for up to 4 years without flowering (Soil … Mature plants are normally 30-50 cm tall, with flowers from July through to late autumn. Each plant lives for 2 years (like ragwort) producing a flatted rosette of leaves in year one and then the familiar ‘tree-like’ structure in year two. It is unclear whether fire will completely kill bull thistle. Blanket wipers or wick applicators using 50% glyphosate can provide some selective control. An annual or short-term perennial herb with erect growth to 1.5 m tall. Know your thistles? Studies were conducted in Sierra Nevada, California, to determine whether cutting adult thistles (C. vulgare), near the root crown, might control thistle populations. Stems have spiny wings and are cobwebby. Spear thistle Scientific name: ... Atlantis Aquifer Invasive Plant Control. Bull thistle, Cirsium vulgare (Savi) Tenore, is an invasive thistle from Eurasia, found throughout the United States and in Canada from Newfoundland to British Columbia. You may find that repeated digging out of roots reduces the problem, but chemical control will provide a quicker solution. Eliminating seed production is the most effective mechanical control technique. Zimmermann HG, 1990. Flowers: Purple, flat topped flowers from July to … SAFFRON THISTLE. It is also possible to remove them by digging. Scotch thistle generally has 1 main stem with numerous branches and broad spiny wings covered with dense woolly hairs, giving a whitish appearance. Considered noxious under the BC Weed Control Act, Canada thistle is commonly found on roadsides, cultivated fields, pastures, logged forests, riverbanks, and other disturbed areas. Read the manufacturers’ labels and material safety data sheets before using herbicides. Spear thistle Print page . Spear Thistle . Agric. 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. Long-term control is possible from herbicide treatment; spear thistle is susceptible to clopyralid and moderately susceptible to MCPA herbicides. 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. The flowers are purple in colour and made up of many little florets (tiny flowers), with spines on the stem and leaves. Biological control of spear thistle, Cirsium vulgate (Asteracea:), in South Africa. Lifecycle: Perennial. 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). Creeping thistle can quickly spread in grassland areas and borders. 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