What about spiders?
Anyway, the fire ant problem is a year round hassle. There has to be a less interactive solution. Chemicals are expensive when used regularly. During the rainy season, they are less effective, sometimes a total waste of money. The intent of this thread was to see if somebody has thought up an electrical solution. I don't know if anybody could slip a product past the chemical companies, but on the hobby level something might be done.
I'm going to keep researching fire ant, maybe I see something useful. The bit about fire ants being attracted to electrical equipment (traffic light controller, transformers, air conditioners) leads me to believe they can be lured into a trap. Maybe heat or high voltage will kill them. Being an outdoor project, and torrential rains, guessing high voltages probably not the best option. Maybe there is some kind of plastic they can't climb on, fall into a container and drown.
I'm sure there is a solution, mankind has been so succesful as a species, because destroy everything we don't like (even other people). Just a matter of time and thought. This isn't a commercial venture, think it would be a marketing nightmare. If it works reasonably well, then there would be some profits, but the competition would fight it. The Chineese would take it apart, make it smaller and cheaper. The chemical companies would absolutely hate it. Ever home owner spends atleast $60-$100 each year, an electronic device would be a buy once, years of use. And finally, the ultrasonic pest control scam...