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My wife has been spraying Ant repellant down the holes, but will try ant powder as well, will try anything to get rid of them, without harming the lawn. thanks again.
I was given a tip by a gardener some years back which seems to work well!
Ants will not walk over talcum powder, so get the cheapest of the cheap for a few pence from your local pound shop.
If the ants are also getting indoors, but a ring of talc around where they are getting in and they're gone in moments