Boric acid works, too. In fact it works well against any insects with a shell exoskeleton, like cockroaches, ants, or termites. The boric crystal punctures their exoskeleton causing them to lose body fluid.

It also works against the colony as it’s a slow acting agent that the insects can bring it back to the colony. The insects communicate by touching so the powder is spread from one to the other when they rub each other’s antenna during meeting.

Boric is really cheap. A large bottle in Home Depot is about $4 to $5.

Edit: story time. My parents used to live in a mixed use condo building where the commercial ground floor had a number of restaurants. They had a bad cockroach problem. I got him a bottle of boric acid and sprayed around the pipes and corners. He never saw another cockroach again.

We had a swarming of termites outside around the house after a raining season. Called the termite guys. They came out and said it’s the subterranean termites under the ground outside and the water disturbed them. They drilled holes around the house and injected liquid solution into them. They sprayed the crawl space underneath. I asked them what the solution was. They said it’s basically boric. Oof. Their service charged $2800 and the material was boric.