I suggest the following procedure for eliminating ant mounds in lawns. First, rake the ant mound down level by spreading the dirt to the surrounding area. Wait several days to see if the ants rebuild the mound. If they do, you can chose to use an insecticide to reduce the population rather than fight the mound with repeated raking. After the mound has been raked level, sprinkle a small amount of diazinon granules or Sevin dust onto the area. Rake again to mix the insecticide into the dirt and then water the area. Hopefully one treatment will reduce the ant population sufficiently to make their presence tolerable for the remainder of the summer. If not, repeat as needed.
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By Amanda, Phils. (Guest Post)
You can use an insecticide with extra nozzle, dip the nozzle in the center of the mound & spray for a few seconds. Once the ants started coming out, pour a boiling water onto the mound & around it.
By EG (Guest Post)
I assume you are talking about fire ants. If so, this is what we do in Texas -- sprinkle dry grits around the ant mound. Ants take the grits back inside the mound as food, eat it, and "pop", they blow themselves up. This is cheaper and safer than insecticides. I've also heard that if you have 2 mounds close to each other, take a shovel full of mound dirt from one and throw it on the other mound. The ants "fight it out" and destroy each others mounds.