The neonics are a class of neuro-active insecticides chemically similar to nicotine. Shell (in the 1980s) and Bayer (in the 1990s) started work on their development. The neonicotinoid family includes acetamiprid, clothianidin, imidacloprid, nitenpyram, nithiazine, thiacloprid and thiamethoxam. Imidacloprid was the most widely used insecticide in the world at one point.
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