OK, we’re having ant infestations in this house. They eat the regular boric-acid-based ant bait like candy and come back for more. First we tried a borate-based ant bait my landlord had (I forget the brand name) and then Raid Ant Gel (which doesn’t actually say what the active ingredient is, but I’m guessing it’s the same). In previous infestations, these were quite effective. These new guys aren’t fazed in the least. They really do just gobble it all up and keep coming.
So what is the solution? I’d really rather not spray insecticide around, at least not the nerve-agent type. The actual nests are outside or under the house somewhere anyway, so it’d be hard to make sure we got them. Any suggestions?
ETA: is it possible that the boric acid breaks down due to age? I wouldn’t expect that, but could be wrong.