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Applying herbicide: Herbicides dominated by phenoxy compounds (especially MCPA) caused drastic declines in thistle infestation in Sweden in the 1950s. [12] MCPA and clopyralid are approved in some regions. Glyphosate is a non-selective herbicide that can be used when the plant has grown a few inches tall, where the herbicide can be absorbed by ...
Clopyralid is in the picolinic acid family of herbicides, which also includes aminopyralid, picloram, triclopyr, and several less common herbicides. [ 2 ] [ 3 ] For control of creeping thistle, Cirsium arvense , a noxious, perennial weed, clopyralid is one of the few effective herbicides available.
Spear thistle is designated an "injurious weed" under the UK Weeds Act 1959, [19] and a noxious weed in Australia [18] [20] [21] and in nine US states. [22] Spread is only by seed, not by root fragments as in the related creeping thistle C. arvense. It is best cleared from land by hoeing and deep cutting of the taproot before seeds mature ...
Often also referred to as creeping, small-flowered, or perennial thistle, this is a non-native, deep-rooted perennial that can grow two to four feet high with flowers varying from white to purple ...
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The Canada thistle gall fly has been introduced to North America from Europe to control the population of its host plant, Canada, or creeping thistle, which is an invasive, introduced weed in North America. Gall formed by U. cardui on Cirsium arvense
Cirsium vulgare (spear thistle) is listed in the United States (where as a non-native invasive species it has been renamed "bull thistle") as a noxious weed in nine states. [6] Some species in particular are cultivated in gardens and wildflower plantings for their aesthetic value and/or to support pollinators such as bees and butterflies.
The Creeping Thistle is a common resilient perennial plant found in grasslands throughout the United Kingdom. Characterised by spined lobed leaves, it stands up to one metre high and blooms with light purple flowers between July and September.
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