I don't like using the fire ant killer because all of the rain that falls in my yard eventually ends up in my pond. Nothing has ever been killed, but I still worry about it.
If the cornmeal will work, it would be a wonderful alternative for me!
When I was young the fire ants were moving across the coastal plain. When the ants were up in the mounds, Dad and I would each get a shovel, dig out a big scoop and put it on the other mound.
Then you knocked the remaining ants off the shovel.
Enough of the invading ants made it to kill the queen and the mounds died.
Now it appears the crazy ants are wiping out the fire ants.