Greg wrote:

Use a Boric Acid/sugar solution.


I have a grease ant problem and I had a bit of success with boric acid and
purina. They stopped eating purina.
Then they went after the canned stuff.
I mixed up some of the "gravy" in the bottom of the can with boric acid. They
managed to eat the gravy and LEAVE the boric acid!!!

I suppose those yankee ants are easier to kill that Florida ants.
These guys even shake off Raid ant and roach spray. If you hit them with the
liquid it kills them but as soon as it dries they walk over it with impunity.
Dursban seems to get them but only if you make an unbroken perimeter. If they
find a 1/4" spot you missed it becomes an ant highway.

My wife is a fan of the boric acid stuff, but it never works...

You can buy a 20lb bag of granules for not much at the hardware store
(or a can if you're problems are intermediate for a lot more/ounce) and
sprinkle some of them around...they'll carry it back to the den and
eradicate themselves usually for a good while...occasionally a queen or
enough of a residual egg cache will hatch out to re-establish the
colony, but normally it will take a new crop moving in. Inside the
house it usually will take a while.

I would not suggest this in areas if you have children who crawl on the
floor or very small pets, but the granules are otherwise no problem and
whatever is leftover can be picked up and re-used...the last little bit
is easily cleaned up w/ vacuum. I know, bags are labelled for exterior
use, but w/ the caveat of keeping children/pets away from them....