Erythritol, a Non-Nutritive Sweetener, Is a Palatable Ingested Insecticide
ncbi.nlm.nih.gov
ncbi.nlm.nih.gov
Some casual searching suggests that erythritol may be effective against fire ants as well, e.g. https://academic.oup.com/jee/article-abstract/110/2/593/3063...