Bayer AG is a German chemicals and pharmaceuticals company founded in 1863. It is headquartered in Leverkusen, North Rhine-Westphalia, Germany.

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Bayer became part of IG Farben, a conglomerate of German chemical industries that emerged during World War I. When the Allies disintegrated IG Farben after World War II due to several war crimes, the company reappeared as an individual business.

Bayer Cropscience

In 2002 Bayer AG aquired Aventis CropScience and formed Bayer CropScience. In additon to conventional agrochemical business it is involved in
genetic engineering of food.

Bayer AG is involved in an ongoing controversy with French and Nova Scotian beekeepers over claimed pesticide kills of honeybees from its seed treatment insecticide Gaucho.

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