Identification and Management of Bull Thistle
Bull thistle, also called spear thistle, Fuller’s thistle, and lance-leafed thistle, is a biennial in the sunflower (Asteraceae) family. A native of Eurasia, it is widely established in North America after continuously being introduced as a seed contaminant.
Chapter 19 Bull Thistle (Spear Thistle) - Biological Control of ...
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. It is capable of invading fields, pastures, wastelands and along roadsides, but will not survive in cultivated fields.
Cirsium vulgare - Wikipedia
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).
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Bull Thistle - pa
Biology and Spread: Bull thistle reproduces and spreads exclusively by seed. Plants produce 100 to 300 seeds per flower head, with up to 400 flower heads per plant. Seeds exhibit features that are suited for wind dispersal. Roughly 90 percent of seeds land within a distance of 1.5 times the height of the parent plant, however up to 10
Biology Bull thistle is a biennial species that reproduces by seed. The root system consists of several primary roots each with several smaller lateral roots. It does not reproduce by vegetative means. Bull thistle is erect and bushy in appearance, up to 2 m high, and has many spreading branches (Fig. 1). Stems are erect, stout, often branched ...
Cirsium vulgare (spear thistle) | CABI Compendium - CABI Digital …
2021年11月17日 · The accepted common name is bull thistle, but it also known by a variety of other common names throughout its range (Parsons and Cuthbertson, 1992; Forcella and Randall, 1994; Beck, 1999). C. vulgare is a biennial, or occasionally a monocarpic perennial (Grime et al., 1988). The seedling is hairy and produces numerous spines.
2007年1月2日 · Biology and Invasive Potential. Reproductive potential: Bull thistle reproduces only by seeds. Crosspollination is required to - produce fertile seeds; a wide variety of insects pollinate bull thistle. The mean seed production of bull thistle 4,000 seeds is per plant. Up to 90% of the seeds produced by bull thistle germinate within a year.
(PDF) Bull Thistle (Spear Thistle) - ResearchGate
2002年1月1日 · 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.
Bull Thistle Identification and Management - Penn State Extension
2023年1月3日 · Bull thistle (Cirsium vulgare) is a biennial that true to its name, has notable spines. This plant is much different than Canada thistle. The foliage of bull thistle has stiff hairs on top and a woolly appearance on the bottom; while Canada thistle is smooth on top and either smooth or hairy on the underside.
Bull thistle | College of Agricultural Sciences - Oregon State …
Bull thistle is a biennial that forms a rosette the first year. Rosettes can grow up to 3 feet across. Erect foliage and flower stems are formed the second year. Mature plants are branched and often grow 2 to 5 feet tall. Dark bluish-green foliage is pinnately lobed with coarse hairs covering the top surface, woolly hairs covering the underside.