Diflubenzuron is a direct-acting insecticide normally applied directly to plants or water. Diflubenzuron, besides its use in agriculture, horticulture and forestry against larvae of Lepidoptera, Coleoptera, Diptera, Hymenoptera, and in public health against larvae of mosquitoes, is used as a veterinary drug for the treatment of sea lice infestations in Atlantic salmon. Diflubenzuron acts by interference with the synthesis of chitin. It is reported that public exposure to diflubenzuron through either food or drinking-water is negligible.