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  2. Clopyralid - Wikipedia

    en.wikipedia.org/wiki/Clopyralid

    Clopyralid (3,6-dichloro-2-pyridinecarboxylic acid) is a selective herbicide used for control of broadleaf weeds, especially thistles and clovers.Clopyralid is in the picolinic acid family of herbicides, which also includes aminopyralid, picloram, triclopyr, and several less common herbicides.

  3. Cirsium arvense - Wikipedia

    en.wikipedia.org/wiki/Cirsium_arvense

    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 ...

  4. We've Figured Out How to Successfully Kill Every Kind of Weed ...

    www.aol.com/weve-figured-successfully-kill-every...

    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 ...

  5. Cirsium vulgare - Wikipedia

    en.wikipedia.org/wiki/Cirsium_vulgare

    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 ...

  6. Why you shouldn’t always dig up weeds - AOL

    www.aol.com/why-shouldn-t-always-dig-080048167.html

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  7. Cirsium - Wikipedia

    en.wikipedia.org/wiki/Cirsium

    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.

  8. Thistle - Wikipedia

    en.wikipedia.org/wiki/Thistle

    Milk thistle flowerhead Cirsium arizonicum, showing arachnoid cobwebbiness on stems and leaves, with ants attending aphids that might be taking advantage of the shelter. Thistle is the common name of a group of flowering plants characterized by leaves with sharp spikes on the margins, mostly in the family Asteraceae. Prickles can also occur all ...

  9. Urophora cardui - Wikipedia

    en.wikipedia.org/wiki/Urophora_cardui

    The fly starts life as an egg, one to thirty of which are laid on the stems of its host plant, the Canada or creeping thistle (Cirsium arvense), during the host's growing season. After hatching, the larvae burrow into the stem and form a gall (or swelling). The larvae grow to reach 98% of their full adult body weight, and overwinter in the gall ...

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