Bees got very aggressive after I removed the queen. Landowner asked me to exterminate so I reluctantly did this morning before sealing up the entrance to the tree. Next time, if aggression is a concern, I might try leaving the queen in the trap (with the one-way funnel in place of course) until all of the brood has emerged in the tree and entered the trap. Might have to super the trap, but I think that would work.

Full story here:
http://www.luterra.com/blog/?p=615