I found a nest, well, actually they found me, the other day that must have been huge. Got stung three times before I could get away. Went to the truck, filled a 32oz Powerade bottle full of gas, sneaked back and poured that in their hole leaving the bottle. 5 minutes later there was what looked like a couple of hundred flying around the bottle. Went back two days later and now they were going in and out of a new hole near the base of a pine tree a couple of feet from the still in place Powerade bottle. Over a 30 minute period I hit the new hole with a can and a half of spray from Home Depot but never did kill them all. Finally mowed, at top speed, as close to the tree as possible and called it good.