When this product is sprayed on plants and is eaten by insects, it is as if a disease has started. They stop feeding soon after exposure, and die within a few days. B.t. is available under that name, or as a powder or a liquid. There may be other trade names for it. It punctures the insects, especially the breathing system, and causes them to dry out.
Boric acid comes as a white, crystalline powder.
It is also found in some liquid ant baits, and many of the roach baits. The powder is useful against fleas and roaches. It should be applied to carpets and worked in, then left for a few hours or days. After this time, vacuum well to remove the boric acid and the dead bugs. Pets, children, and bare feet should stay off the carpet while the boric acid is doing it's work.