Boric acid does kill termites and is one of the most effective ways to do so. Boric acid stops the nervous system from functioning and dehydrates termites. Boric acid is a weak monobasic acid of boron.
Boric acid was first registered as an insecticide in the United States in 1948 to control cockroaches, fleas, silverfish and fire ants in addition to termites and other insects. Boric acid may also be used to treat external wood in the prevention of fungal and insect attacks.
The termite diet consists of dead plants and trees and dead portions of living trees. Termites are typically only a few millimeters in length but are capable of causing great destruction.