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Methoprene, Insect Growth Regulator for Fleas

- Used to provide long-term control of fleas -

Summary: Methoprene is a very low toxicity chemical that prevents immature flea larvae from completing development to the adult stage. Methoprene is long-lasting, inexpensive and easy to use.

Jack DeAngelis, PhD
OSU Ext. Entomologist (ret.)

What is methoprene?

Insect growth regulators (IGRs), like methoprene, are chemicals that prevent larval fleas from developing into biting adult fleas. Flea larvae that are exposed to IGRs eventually die. IGRs are often used with other methods of flea control to provide long-term protection. Flea control products that contain methoprene often include a statement like "breaks the flea life cycle". You may also see the tradename Precor instead of methoprene.

IGR sprays should be used to treat pet bedding, carpets and other areas where flea larvae might be found. This method is more effective than treating the pet directly because flea larvae don't live on the animal but rather in the animal's nest.

 

IGR products are available in both hand-pump spray bottles and pressurized aerosol cans. Pump spray bottles are generally easier to control and usually more economical than aerosol spray cans.

Using insect growth regulators for fleas

Use IGR sprays to treat pet bedding, carpets, and other areas where pets sleep. IGRs should be used in addition to topically-applied flea and tick control medications like Frontline Top Spot.

IGRs do not control adult fleas but they prevent immature fleas (larvae) from completing development to the adult stage. IGRs are very long-lasting and should only be needed a few times per year. Follow package instructions carefully. Do not apply IGRs to the pet -- these products are intended for premise treatment.

I prefer hand-pump sprayers because they are more economical and easier to control than aerosol spray cans. Pump sprayers also produce a larger droplet which is less likely to get up your nose during treatment!

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Jack DeAngelis, Ph.D.

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