I have always struggled with ants on my property since I built the house in 1999. FINALLY, I have found something that will work and is not so darn toxic to the environment. We have a well, so I am cognizant of chemicals that are applied. Through the good folk here on BYC, I learned about Diatomaceous Earth. Have you tried it on and around an ant mound? I did. I first tried just putting a ring around the mound. Later, I just kicked the head of the fire ant mound and waited for the swarm then dusted the mound and all the worker ants. The results from my experience are that the ants have been greatly reduced. What are others experience using DE on ant mounds?