Advion ant gel is a gift from the insecticidal gods when it comes to controlling argentine ants in Southern California. It's not a nerve agent until converted by ant digestion using an enzyme not found in mammal guts so it's comparatively safe to use around humans, and the ants never develop resistances to it. We're still surrounded by a massive super colony reaching from San Diego to Santa Barbara, but I have no problems keeping my house and yard ant free, side from the occasional and inevitable failed incursions.