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Herbicide

herbicidesherbicidalweed killer
2,4-Dichlorophenoxyacetic acid (usually called 2,4-D) is an organic compound with the chemical formula C 8 H 6 Cl 2 O 3 . It is a systemic herbicide which selectively kills most broadleaf weeds by causing uncontrolled growth in them, but leaves most grasses such as cereals, lawn turf, and grassland relatively unaffected. 2,4-D is primarily used as a selective herbicide which kills many terrestrial and aquatic broadleaf weeds, but not grasses.
The first modern herbicide, 2,4-D, was first discovered and synthesized by W. G. Templeman at Imperial Chemical Industries.

Defoliant

defoliationdefoliantsdefoliate
2,4-D is one of the oldest and most widely available herbicides and defoliants in the world, having been commercially available since 1945, and is now produced by many chemical companies since the patent on it has long since expired.
Two of the oldest chemical herbicides used as defoliants are 2,4-Dichlorophenoxyacetic acid (2,4-D) and 2,4,5-Trichlorophenoxyacetic acid (2,4,5-T).

Mecoprop

2,4-D can be found in commercial lawn herbicide mixtures, which often contain other active ingredients including mecoprop and dicamba.
It is often used in combination with other chemically related herbicides such as 2,4-D, dicamba, and MCPA.

Auxin

auxinsrooting hormonerooting hormones
It acts by mimicking the action of the plant growth hormone auxin, which results in uncontrolled growth and eventually death in susceptible plants. 2,4-D is a synthetic auxin, which is a class of plant hormones.
Synthetic auxin analogs include 1-naphthaleneacetic acid, 2,4-dichlorophenoxyacetic acid (2,4-D), and many others.

List of IARC Group 2B carcinogens

Group 2BIARC Group 2B carcinogenGroup 2B carcinogen
The International Agency for Research on Cancer (IARC), said 2,4-D was classified as "possibly carcinogenic to humans (Group 2B), based on inadequate evidence in humans and limited evidence in experimental animals".
2,4-D (2,4-dichlorophenoxyacetic acid)

Enlist Weed Control System

In October 2014, the US EPA registered Enlist Duo, an herbicide containing the less volatile 2,4-D choline salt, glyphosate, and an antidrift agent, for use in six states: Illinois, Indiana, Iowa, Ohio, South Dakota, and Wisconsin.
The Enlist Weed Control System is an agricultural system that includes seeds for genetically modified crops that are resistant to Enlist (a broadleaf herbicide with two active agents, 2,4-Dichlorophenoxyacetic acid (2,4-D) and glyphosate) and the Enlist herbicide; spraying the herbicide will kill weeds but not the resulting crop.

Lawn

GrassturfgrassGrass pitch
2,4-Dichlorophenoxyacetic acid (usually called 2,4-D) is an organic compound with the chemical formula C 8 H 6 Cl 2 O 3 . It is a systemic herbicide which selectively kills most broadleaf weeds by causing uncontrolled growth in them, but leaves most grasses such as cereals, lawn turf, and grassland relatively unaffected.
Lawn maintenance commonly involves use of inorganic fertilizers and synthetic pesticides. These cause great harm. Many are carcinogens and endocrine disruptors. They may permanently linger in the environment and negatively affect the health of potentially all nearby organisms. The United States Environmental Protection Agency has estimated nearly 32000000 kg of active pesticide ingredients are used on suburban lawns each year in the United States. There are indications of an emerging regulatory response to this issue. For example, Sweden, Denmark, Norway, Kuwait, and Belize have placed restrictions on the use of the herbicide 2,4-D.

Glyphosate

Roundupglycosphateglyphosates
Dow intended it to be used as an alternative or complement to Roundup Ready crops due to the increasing prevalence of glyphosate-resistant weeds.
In 2007, glyphosate was the most used herbicide in the United States' agricultural sector and the second-most used (after 2,4-D) in home and garden, government and industry, and commercial applications.

2,4-Dichlorophenol

2,4-D is manufactured from chloroacetic acid and 2,4-dichlorophenol, which is itself produced by chlorination of phenol.
2,4-Dichlorophenol (2,4-DCP) is a chlorinated derivative of phenol with the molecular formula C 6 H 4 Cl 2 O. 2,4-DCP is used primarily as an intermediate in the preparation of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D).

Plant hormone

phytohormoneplant growth regulatorsplant hormones
2,4-D is a synthetic auxin, which is a class of plant hormones.
Because of this property, synthetic auxin herbicides including 2,4-D(2,4-dichlorophenoxyacetic) and 2,4,5-T have been developed and used for weed control.

Agent Orange

defoliantAgent Orange § U.S. veterans class action lawsuit against manufacturersdefoliants
2,4-D is one of the ingredients in Agent Orange, an herbicide that was widely used during the Vietnam War.
It is a mixture of equal parts of two herbicides, 2,4,5-T and 2,4-D.

Rothamsted Research

Rothamsted Experimental StationRothamstedIACR Rothamsted
The discovery of 2,4-D as well as the similar hormone herbicides 2,4,5-T, and MCPA occurred during World War II and was a case of multiple discovery by four groups working independently under wartime secrecy in the United Kingdom and the United States: William G. Templeman and associates at Imperial Chemical Industries in the UK; Philip S. Nutman and associates at Rothamsted Research in the UK; Franklin D. Jones and associates at the American Chemical Paint Company; and Ezra Kraus, John W. Mitchell, and associates at the University of Chicago and the United States Department of Agriculture.
During World War II, aiming to increase crop yields for a nation at war, a team under the leadership of Judah Hirsch Quastel developed 2,4-D, still the most widely used weed-killer in the world.

Phenoxy herbicide

phenoxy acidphenoxy herbicideschlorophenoxy acid herbicides
2,4-D is a member of the phenoxy family of herbicides.
The best known phenoxy herbicides are MCPA, 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T).

2,4,5-Trichlorophenoxyacetic acid

2,4,5-T2,4,5‐T245-T
The discovery of 2,4-D as well as the similar hormone herbicides 2,4,5-T, and MCPA occurred during World War II and was a case of multiple discovery by four groups working independently under wartime secrecy in the United Kingdom and the United States: William G. Templeman and associates at Imperial Chemical Industries in the UK; Philip S. Nutman and associates at Rothamsted Research in the UK; Franklin D. Jones and associates at the American Chemical Paint Company; and Ezra Kraus, John W. Mitchell, and associates at the University of Chicago and the United States Department of Agriculture. In a prior 1987 report the IARC classified some chlorphenoxy herbicides including 2,4-D, MCPA and 2,4,5-T as a group as class 2B carcinogens - "possibly carcinogenic to humans".
Agent Orange, a defoliant used by the British in the Malayan Emergency and the U.S. in the Vietnam War, was equal parts 2,4,5-T and 2,4-D (2,4-dichlorophenoxyacetic acid).

Indole-3-acetic acid

IAAindole acetic acidindoleacetic acid
William Tempelman found that when indole-3-acetic acid (IAA), the naturally occurring auxin, was used at high concentrations, it could stop plant growth.
The search for an acid with a longer half life, i.e. a metabolically and environmentally more stable compound led to 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), both phenoxy herbicides and analogs of IAA.

Vietnam War

Vietnamwar in Vietnamwar
2,4-D is one of the ingredients in Agent Orange, an herbicide that was widely used during the Vietnam War.
American officials also pointed out that the British had previously used 2,4,5-T and 2,4-D (virtually identical to America's use in Vietnam) on a large scale throughout the Malayan Emergency in the 1950s in order to destroy bushes, crops, and trees in effort to deny communist insurgents the concealment they needed to ambush passing convoys.

Genetically modified crops

genetically modifiedtransgenic cropsgenetically modified crop
Genetically modified crops#Herbicide resistance
In October 2014 the US EPA registered Dow's Enlist Duo maize, which is genetically modified to be resistant to both glyphosate and 2,4-D, in six states.

Organic compound

syntheticorganicorganic compounds
2,4-Dichlorophenoxyacetic acid (usually called 2,4-D) is an organic compound with the chemical formula C 8 H 6 Cl 2 O 3 . It is a systemic herbicide which selectively kills most broadleaf weeds by causing uncontrolled growth in them, but leaves most grasses such as cereals, lawn turf, and grassland relatively unaffected.

Chemical formula

formulamolecular formulageneral formula
2,4-Dichlorophenoxyacetic acid (usually called 2,4-D) is an organic compound with the chemical formula C 8 H 6 Cl 2 O 3 . It is a systemic herbicide which selectively kills most broadleaf weeds by causing uncontrolled growth in them, but leaves most grasses such as cereals, lawn turf, and grassland relatively unaffected.

Broad-leaved tree

broadleafbroad-leavedbroadleaf tree
2,4-Dichlorophenoxyacetic acid (usually called 2,4-D) is an organic compound with the chemical formula C 8 H 6 Cl 2 O 3 . It is a systemic herbicide which selectively kills most broadleaf weeds by causing uncontrolled growth in them, but leaves most grasses such as cereals, lawn turf, and grassland relatively unaffected.

Grassland

grasslandsgrassveldgrass
2,4-Dichlorophenoxyacetic acid (usually called 2,4-D) is an organic compound with the chemical formula C 8 H 6 Cl 2 O 3 . It is a systemic herbicide which selectively kills most broadleaf weeds by causing uncontrolled growth in them, but leaves most grasses such as cereals, lawn turf, and grassland relatively unaffected.

Weed

weedsvegetable pestsweedy species
2,4-D is primarily used as a selective herbicide which kills many terrestrial and aquatic broadleaf weeds, but not grasses.

Poaceae

grassturfgrass family
2,4-Dichlorophenoxyacetic acid (usually called 2,4-D) is an organic compound with the chemical formula C 8 H 6 Cl 2 O 3 . It is a systemic herbicide which selectively kills most broadleaf weeds by causing uncontrolled growth in them, but leaves most grasses such as cereals, lawn turf, and grassland relatively unaffected. 2,4-D is primarily used as a selective herbicide which kills many terrestrial and aquatic broadleaf weeds, but not grasses.

Dicamba

2,4-D can be found in commercial lawn herbicide mixtures, which often contain other active ingredients including mecoprop and dicamba.

Cell culture

cultureculturedcell cultures
2,4 D has been used in laboratories for plant research as a supplement in plant cell culture media such as MS medium since at least 1962.