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Skeletal formula
Ball-and-stick model
CAS number 40596-69-8 YesY
PubChem 5366546
ChemSpider 4518347
KEGG C14308 YesY
MeSH C093000
ATCvet code QP53AX28
Jmol-3D images Image 1
Molecular formula C19H34O3
Molar mass 310.48 g/mol
Appearance Liquid
Boiling point 100 °C at 0.05 mmHg
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
Infobox references

Methoprene is a juvenile hormone (JH) analog which acts as a growth regulator when used as an insecticide. It is an amber-colored liquid with a faint fruity odor which is essentially nontoxic to humans when ingested or inhaled. It is used in drinking water cisterns to control mosquitoes which spread dengue fever and malaria.[2]

Methoprene does not kill adult insects. Instead, it acts as a growth regulator, mimicking natural juvenile hormone of insects. Juvenile hormone must be absent for a pupa to molt to an adult, so methoprene-treated larvae will be unable to successfully change from pupae to adults. This breaks the biological life cycle of the insect, preventing recurring infestation. Methoprene is used in the production of a number of foods, including meat, milk, mushrooms, peanuts, rice, and cereals. It also has several uses on domestic animals (pets) for controlling fleas. Methoprene is considered a biochemical pesticide because rather than controlling target pests through direct toxicity, methoprene interferes with an insect’s lifecycle and prevents it from reaching maturity or reproducing.[3] Methoprene is used most widely as the mosquito larvicide Altosid, which is an important measure in reduction of the spread of West Nile virus.

Methoprene is also used as a food additive in cattle feed to prevent fly breeding in the manure.

Methoprene may be responsible for killing and stunting the growth of lobsters in Narragansett Bay.[4] However, considering the durability of the chemical in the environment (about two days), the lasting effect of the biological activity of the substance in the environment (about one week), it should be further investigated. [5] These timelines, coupled with runoff of fresh surface waters into the ocean from inland areas, suggest it is very possible or likely that methoprene enters the ocean ecosystem in an active form. Studies would have to be conducted to test the hypothesis that methoprene interferes with the lifecycle of lobsters before a conclusion can be reached.


  1. ^ Merck Index, 11th Edition, 5906.
  2. ^ "Methoprene". Water Sanitation and Health. World Health Organization. Retrieved 2008. 
  3. ^ "Insect Growth Regulators: S-Hydroprene (128966), S-Kinoprene (107502), Methoprene (105401), S-Methoprene (105402) Fact Sheet". U.S. Environmental Protection Agency. Retrieved 2007-09-09. 
  4. ^ "Are our lobsters casualties in war on mosquitoes?". Retrieved 2008-07-18. 
  5. ^ "Studies On The Dissipation of Diflubenzuron and Methoprene From Shallow Prairie Pools". Retrieved 2011-10-25. 

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