I have become really skilled at taking these bastages out with my co2 pistol. The only thing is you have to be really careful and pay attention to whats on the other side of the bee, instead of just concentrating on hitting the bee. I get them 9 out of 10 times first shot. After that, go online and pick up Drione Dust, and a small handheld duster. puff some dust into the hole then seal the hole up so it isnt used in the future. Drione dust work really well at places you cant see or reach. I've had great success at nailing wasp nests in the ground as well. Just place the powder in a paper cup, sneak out at night and dump it on their hole. next day most bees are gone, day after all gone.