How to get rid of brown ants in the soil under the grass?

You can get rid of ants with cornmeal. Just sprinkle some where you see a hill or trail of ants. They gobble it up and take it back to the queen. It kills them. We use Jiffy because it is sweet and they really like it. One box for about 34 cents is good for about 5 applications or more, depending on the size of the colony.

Here's more ideas from fellow hometalkers:

http://www.hometalk.com/search/posts?filter=get%20rid%20of%20ants

Good luck

here are three things you could try:

1. a mixture of 3% dish soap with water spray
2. diatomaceous earth
3. mixture of borax and sugar water spray

If it's not too much of a both, the best thing would be is to live harmoniously with them as ants eat the larvae of lawn pests they find among the roots grass.

Put down Ant Powder, because you have a nest with Babies.........