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Skeletal formula of coumaphos
Space-filling model of the coumaphos molecule
IUPAC name
O,O-Diethyl O-3-chloro-4-methyl-2-oxo-2H-chromen-7-yl phosphorothioate
Other names
Coumafos, Meldane, Asunthol, Azunthol, Muscatox, Agridip, Asuntol, Meldone, Resitox, Baymix
56-72-4 YesY
ATCvet code QP53AF08
ChEMBL ChEMBL251680 YesY
ChemSpider 2768 YesY
Jmol-3D images Image
KEGG D07750 YesY
PubChem 2871
Molar mass 362.77 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 YesY verify (what isYesY/N?)
Infobox references

Coumaphos is a nonvolatile, fat-soluble phosphorothioate with ectoparasiticide properties: it kills insects and mites. It is well known by a variety of brand names as a dip or wash, used on farm and domestic animals to control ticks, mites, flies and fleas.[1]

It is also used to control Varroa mites in honey bee colonies, though in many areas it is falling out of favor as the mites develop resistance and as the residual toxicity effects are becoming better understood.[2][3]

In Australia, its registration as suited to home veterinary use was cancelled by the Australian Pesticides and Veterinary Medicines Authority in June 2004 after the manufacturer failed to show it was safe for use on pets.[4]

The compound has been linked to neurological problems in bees, and may be a factor in colony collapse.[5]


  1. ^ "Asuntol - Cattle, Goat, Sheep - anti lice, fleas, sucking flies and mite". 
  2. ^ "A Review of Treatment Options for Control of Varroa Mite in New Zealand". 
  3. ^ Johnson, Reed M.; Ellis, Marion D.; Mullin, Christopher A.; Frazier, Maryann (2010). "Pesticides and honey bee toxicity – USA". Apidologie 41 (3): 312. doi:10.1051/apido/2010018. 
  4. ^[dead link]
  5. ^

External links[edit]

  • Coumaphos, US Environmental Protection Agency