Clopyralid

Clopyralid^[1]
Names


Preferred IUPAC name 3,6-Dichloropyridine-2-carboxylic acid
Other names 3,6-Dichloropicolinic acid
Identifiers
CAS Number	1702-17-6^Y
3D model (JSmol)	Interactive image Interactive image
Abbreviations	3,6-DCP
ChEMBL	ChEMBL1650605^N
ChemSpider	14797^N
ECHA InfoCard	100.015.396
KEGG	C18779^Y
PubChem CID	15553
UNII	10G14M0WDH^Y
CompTox Dashboard (EPA)	DTXSID9029221
InChI InChI=1S/C6H3Cl2NO2/c7-3-1-2-4(8)9-5(3)6(10)11/h1-2H,(H,10,11)^N Key: HUBANNPOLNYSAD-UHFFFAOYSA-N^N InChI=1/C6H3Cl2NO2/c7-3-1-2-4(8)9-5(3)6(10)11/h1-2H,(H,10,11) Key: HUBANNPOLNYSAD-UHFFFAOYAP
SMILES O=C(O)C1=C(Cl)C=CC(Cl)=N1 c1cc(nc(c1Cl)C(=O)O)Cl
Properties
Chemical formula	C₆H₃Cl₂NO₂
Molar mass	192.00
Appearance	White crystalline solid
Melting point	150 to 152 °C (302 to 306 °F; 423 to 425 K)
Solubility in water	~1000 ppm
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references

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.^[2]^[3] 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.^[4] It does not affect grasses (family Poaceae).^{[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^[5] 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.^[4]

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,^[2]^[6] Curtail, Confront, Clopyr AG, Lontrel, Millennium Ultra, Millenium Ultra Plus and Redeem.

References

^ Merck Index, 11th Edition, 2398.
^ ^a ^b Staff, Virginia Tech Cooperative Extension. Revised May 14, 2012 Pyridine Herbicide Carryover: Causes and Precautions Archived 2016-11-30 at the Wayback Machine Accessed May 27, 2013
^ Bob Hartzler, extension weed management specialist, Department of Agronomy, Iowa State University. February 21, 2006 Aminopyralid - New herbicide for pastures, roadsides, etc. Archived 2014-11-03 at the Wayback Machine Accessed May 27, 2013
^ ^a ^b Moody, Oliver (23 February 2013). "Weedkiller banned in US 'is getting into compost and killing garden vegetables'". The Times. London.
^ David E. Haskell , California Department of Pesticide Regulation Clopyralid in Compost^{[permanent dead link‍]} 2003 Proceedings of the California Weed Science Society 55:163-166
^ "Herbicide Resistant Weeds". Archived from the original on 2011-07-18. Retrieved 2011-03-07.

Pest control: herbicides

FOP herbicides	chlorazifop cyhalofop diclofop fenoxaprop fluazifop haloxyfop quizalofop
DIM herbicides	sethoxydim

Protox inhibitors

Nitrophenyl ethers	acifluorfen bifenox fluorodifen fomesafen lactofen nitrofen oxyfluorfen
Pyrimidinediones	butafenacil saflufenacil
Triazolinones	carfentrazone sulfentrazone

Pyridines

Quaternary

Photosystem I inhibitors	cyperquat diquat paraquat

Triazines

Photosystem II inhibitors	ametryn atrazine cyanazine hexazinone prometon prometryn propazine simazine simetryn terbuthylazine terbutryn metamitron

Ureas

Photosystem II inhibitors	chlortoluron DCMU isoproturon linuron monuron monolinuron tebuthiuron
ALS inhibitors	chlorsulfuron flazasulfuron metsulfuron-methyl sulfometuron methyl tribenuron

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