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2,4-D (2,4-DICHLOROPHENOXYACETIC ACID, CAS No. 94-757) was first synthesized by Robert Pokorny of the C. Dolge Company of Westport, Connecticut, and patented during World War II by the American Paint Company as one form of the halogenated phenoxy monocarboylic aliphatic acids. 2,4-D saw its first widespread production and use in the late 1940s, coinciding with the introduction of weed science as a scholarly discipline. 2,4-D is used as a selective, systemic, hormone-type herbicide to control sedge and broadleaf weeds in cereal crops such as rice, wheat, corn, sorghum, and barley; as well as range/pasture lands, turf areas, lawns, rights-of-way, aquatic sites and forestry applications; and as a growth regulator for citrus and potatoes. Trade names include Aqua Kleen, Demise, Esteron, Weed-B-Gone, and Weedone.

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