Use granules and spray on occasion, but for fun keep reading. After a good rain take about a cup or less of gas and oil and mix together. Then take a pipe like a fence pipe or a shovel handle and drive deep down in middle of mound and pull it out. Wait until the ants roll out and a lot will fall back into the hole. Now, pour mixture in hole and on top of mound while running a small line away from mound to light fire. You can light something throw on it from about 10 feet away if you feel more safe.