Herbicides Lawsuit Research: Herbicide Types: 2,4-D
2,4-D (or 2,4-dichlorophenoxyacetic acid) is a common systemic herbicide used in the control of broadleaf weeds. It is the third-most widely used herbicide in North America and the most widely used herbicide in the world.
2,4-D was developed during World War II by a British team at Rothamsted Experimental Station, under the leadership of Judah Hirsch Quastel, aiming to increase crop yields for a nation at war. When it was commercially released in 1946, it became the first successful selective herbicide and allowed for greatly enhanced weed control in wheat, maize (corn), rice, and similar cereal grass crop, because it only kills dicots, leaving behind monocots.
2,4-D is sold in various formulations under a wide variety of brand names. It continues to be used for its low cost, despite the availability of more selective, effective, and less toxic products.
2,4-D is most commonly used for:
- Weed control in lawns and other turf
- No-till burndown
- Control of weeds and brush along fences and highway and railroad rights of way
- Conifer release (control of broadleaf trees in conifer plantings)
- Grass hayfields and pastures
- Cereal grains
- Corn and sorghum (occasionally)
Note: properties given are for the acid. Commercial formulations used today use the trimethylamine salt or one of several esters, for which properties differ.
Relative molecular mass: 221.04
Appearance: Colourless, white to yellow powder when pure
Melting point: 140.5 C
Water Solubility: 900 mg/L @ 25 C
Relative vapour density: 7.6
Vapour pressure: 0.02 mPa @ 25 C, 52.3 Pa @ 160 C
CAS number: 94-75-7
The LD50 in rats has been reported as 375 and 666 mg/kg in two different studies. Single oral doses of 5 and 30 mg/kg body weight did not cause any acute toxic effects in human volunteers.
The amine salt formulations can cause irreversible eye damage.
Atrazine The herbicide Atrazine can cause health problems.
Have you been exposed to Atrazine? Learn more here.
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