Just seen your post from last July. If you still have problems this coming summer try oil of cloves. I saw this suggested on another gardening forum and tried it on some red ant nests that were ruining my front lawn. Got a 10ml bottle from local chemist, not cheap but cheaper online if you look around, mixed half of it in a watering can with one gallon of water in it, put a rose sprinkler on and gave the nest sites a good soaking. It doesn't kill the blighters but they can't stand the stuff and hot foot it pronto. I was amazed how good it was as I had tried all sorts of stuff with limited success. It is a bit pongy though, keep it off the skin and avoid splashing in the eyes, it is very concentrated stuff. Good luck.
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