Finding horsehair worms in odd places is not uncommon. They usually peak during the late summer as well as during the fall months.

Horsehair worms are typically dark brown in color, but some are tan, yellow or black. Horsehair worms belong to the roundworm family and they earned the name because they look just like the thin hair of a horse tail. You can also place an insecticide barrier around your house foundation to kill any arthropod pests infested with horsehair worms.

If you flush it, the horsehair worm will escape from the insect’s body through the toilet. If you kill an insect, make sure you take it out of the home immediately. To keep parasitized insects out of your home, you should caulk or seal entry sites.

treat domestic water supply systems by filtering and treating with chemicals under the direction of the local health department.

install a mesh filter or screen to keep the worms from water pumped from a surface supply such as a farm pond or canal.

use plain water to get rid of them (you can spray them).

If you feel that you have a horsehair worm infestation and they need to be controlled, you can:

That said, because they are not harmful to humans and because they actually kill harmful pests such as grasshoppers, crickets, cockroaches, beetles, millipedes, centipedes, snails, slugs, etc., no control measures are recommended. Unless you kill them right after exiting the body, they parasitize another insect. Horsehair worms can only parasitize suitable insect hosts, so after crushing pests such as crickets, millipedes, or centipedes, the worms will quickly exit the body and crawl for cover.

Download horsehair worms in water