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.<ref name=VT>Staff, Virginia Tech Cooperative Extension. Revised May 14, 2012 Pyridine Herbicide Carryover: Causes and Precautions Template:Webarchive Accessed May 27, 2013</ref><ref>Bob Hartzler, extension weed management specialist, Department of Agronomy, Iowa State University. February 21, 2006 Aminopyralid - New herbicide for pastures, roadsides, etc. Template:Webarchive Accessed May 27, 2013</ref> For control of creeping thistle, Cirsium arvense, a noxious, perennial weed, clopyralid is one of the few effective herbicides available. It is particularly damaging to peas, tomatoes, and sunflowers, and can render potatoes, lettuce, and spinach inedible.<ref name=Moody>Template:Cite news</ref> It does not affect grasses (family Poaceae).Template:Citation needed
Clopyralid is known for its ability to persist in dead plants and compost, and has accumulated to phytotoxic levels in finished compost in a few highly publicized cases. This first came to light in Washington, when during 2000 and 2001, residues of clopyralid were detected in commercial compost, and compost made at a municipal site damaged tomatoes and other garden plants planted in it. Word quickly spread to other local and state governments, and in 2002, DowAgro, the manufacturer of clopyralid, voluntarily deregistered it for use on domestic lawns in the US<ref>David E. Haskell , California Department of Pesticide Regulation Clopyralid in CompostTemplate:Dead link 2003 Proceedings of the California Weed Science Society 55:163-166</ref> and it is banned in several US states, but it is found in consumer products in Europe such as Scotts Verdone Extra and Vitax Lawn Clear 2.<ref name=Moody />
Clopyralid is used in Australia on industrial areas and agriculturally, to control broadleaf weeds in wheat, barley, oats, triticale, and fallow.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
Clopyralid is licensed for lawn use in France and under these names: Bayer Jardin: Désherbant jeune gazon and Scanner Sélectif gazon Vilmorin: désherbant Gazon LONPAR. Brand names of clopyralid in the US market include Stinger, Transline, Reclaim,<ref name=VT /><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Curtail, Confront, Clopyr AG, Lontrel, Millennium Ultra, Millenium Ultra Plus and Redeem.
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