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2,4-Dichlorophenoxyacetic acid is an organic compound with the chemical formula Cl 2 C 6 H 3 OCH 2 CO 2 H.It is usually referred to by its ISO common name 2,4-D. [4] It is a systemic herbicide that kills most broadleaf weeds by causing uncontrolled growth, but most grasses such as cereals, lawn turf, and grassland are relatively unaffected.
The chemical, supplied by Monsanto and Dow Chemical, was a mixture of two herbicides: 2,4,5-T and 2,4-D. The former was phased-out of field use more than 30 years ago due to toxicity concerns ...
Huey helicopters were used to disperse Agent Orange across forests and farms in over 6,500 missions in a nine year period of the Vietnam War. Image source: Wikimedia Commons The use of Agent ...
They were discovered in the 1940s after a long study of the plant growth regulator auxin. Synthetic auxins mimic this plant hormone in some way. They have several points of action on the cell membrane, and are effective in the control of dicot plants. 2,4-D, 2,4,5-T, and Aminopyralid are examples of synthetic auxin herbicides.
In early 1945, the U.S. Army ran tests of various 2,4-D and 2,4,5-T mixtures at the Bushnell Army Airfield in Florida. As a result, the U.S. began a full-scale production of 2,4-D and 2,4,5-T and would have used it against Japan in 1946 during Operation Downfall if the war had continued. [27] [28]
Enlist Duo is an herbicide that contains the choline form of 2,4-Dichlorophenoxyacetic acid (2,4-D) and glyphosate plus an unknown number of unlisted ingredients. Dow added chemicals to the mixture in what it termed "Colex-D technology". [5] 2,4-D is one of the most widely used herbicides in the world.
[citation needed] The most common herbicide used was Herbicide Orange, more commonly referred to as Agent Orange: a fifty-fifty mixture of two herbicides 2,4-D (2,4-dichlorophenoxyacetic acid) and 2,4,5-T (2,4,5-trichlorophenoxyacetic acid) manufactured for the U.S. Department of Defense primarily by Monsanto Corporation and Dow Chemical.
Dithiopyr is a preemergent herbicide for crabgrass control in turf and ornamental grasses. It is effective on 45 grassy and broadleaf weeds. [1] Dithiopyr inhibits root growth of susceptible weeds as well as turf grass and thus should be used only on established turf with a well-developed root system.