Boiling water is fine, but you have not destroyed the conditions that allow them to thrive. Invicta likes disturbed soils with ample sunlight. In a way *lawns* are the problem. If you look at wild land in your area are there lawns? Is there a perfect carpet of green grass? Unless you are in IDK Scotland probably not. The US is a patchwork of grasslands and deep forests, deserts and scrub. So one way to make a big blow against invicta is to get rid of the lawn. Plant native plants instead. Find a wild area that isn't manicured and collect seeds. Find out what plants are native to your region and focus on the native plants you like best, and those that are homes to the best native ants.
It's still possible to have beautiful landscaping with native plants, there are many sources online about "killing your lawn" and I love this idea because it would help local ants.
Sometimes people have things like sprinkler systems, or they do things to promote "healthy lawns" and almost all of these things are things that fire ants love. Like those "soil aireation" machines that disturb the soil-- Get some big flat rocks and plant things with deep roots that shade the ground. Soon the fire ants will move on to find a place with short grass and water fountains. (probably your neighbors)
They are pretty looking ants. But, I don't think there is anything wrong with trying to plan your environment to promote less common species ... and more enjoyable species.
So don't stop at hot water.
(Also, the queens are often too deep for the hot water, the ants simply move in from the next nest over, eat the dead, and keep increasing in number. Pest problems happen because we tend to make perfect pest habitats, then get shocked when they show up.)
Edited by futurebird, April 14 2024 - 9:10 PM.