A friend of mine on the coast between Geraldton and Perth is having a lot of grief from ants which have been identified as Coastal brown ants. They undermine everything and build nests wherever water is - for example they built a huge nest under the lemon tree as it was getting regular water. They have nests under his paving which causes it to subside and invade the house if he is not vigilant.
Is there way to control them ?