OMS or Oms may refer to:
Malathion is an organophosphate insecticide of relatively low human toxicity. In the former USSR, it was known as carbophos, in New Zealand and Australia as maldison and in South Africa as mercaptothion.
Malathion is a pesticide that is widely used in agriculture, residential landscaping, public recreation areas, and in public health pest control programs such as mosquito eradication. In the US, it is the most commonly used organophosphate insecticide.
Malathion as a mixture with corn syrup was used in the 1980s in Australia and California to combat the Mediterranean Fruit Fly. In the Canada and US, Malathion was sprayed in many cities to combat West Nile virus. Malathion was used over the last couple of decades on a regular basis during summer months to kill nuisance mosquitoes, but homeowners were allowed to exempt their properties if they chose. Today, Winnipeg is the only major city in Canada with an ongoing Malathion nuisance-adult-mosquito-control program.