Carbaryl (1-naphthyl methylcarbamate) is a chemical in the carbamate family used chiefly as an insecticide. It is a white crystalline solid commonly sold under the brand name Sevin, a trademark of the Bayer Company.Union Carbide discovered carbaryl and introduced it commercially in 1958. Bayer purchased Aventis CropScience in 2002, a company that included Union Carbide pesticide operations. It remains the third-most-used insecticide in the United States for home gardens, commercial agriculture, and forestry and rangeland protection. As a veterinary drug, it is known as carbaril. Carbaryl is an anticholinesterase inhibitor. It is indicated for the treatment of head and pubic lice. It is available as a lotion (Carylderm) and a shampoo (Carylderm; New Suleo; Derbac). Carbaryl was developed because lice began to show resistance to organochlorine insecticides such as DDT and gamma benzene hexachloride (Quellada; Lorexane). It was introduced in the late 1960s particularly for the control of head lice; it is less effective against mites, and not recommended for scabies.