Ask Dr. Bug - Cockroaches

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Please explain how boric acid works against roaches.

Boric acid is classified as an inorganic insecticide. It is refined from krenite and is formulated into dust and bait formulations for use against pests such as cockroaches, ants, fleas, and silverfish. Boric acid in the dust formulation can be applied to cracks & crevices, wall voids, and other protected areas. Boric acid dust will provide long term residual stability and will remain active even if it should get wet. It is a slow acting stomach poison which can take up to 7 days to kill an insect.

Cockroaches can be controlled using boric acid through contact and ingestion. Once an application is made to a harborage site, cockroaches will travel through the dust and ingest the dust when grooming. Boric acid, when used according to label rates, is non repellant so the roaches will not be flushed into visible areas.

Whitmire Micro-Gen offers Boric acid dust in an aerosol can called PT Perma Dust. PT Perma Dust is packaged in a 9 oz can with a crack & crevice application straw. It is labeled for cockroaches, ants, crickets, spiders and many other pests. PT Perma Dust can be used in homes and commercial accounts, including food handling establishments.