Many have asked for a method to euthanizing a hive that will not contaminate honey and combs.  I have never had combs or honey tested for residues after the moethod I'm about to describe, but I have restocked the equipment and the new stock did well as far as I could determine.
 
The method I use if sulfur fumes.  I get powdered sulfur from a garden supply store (sulfur is user to control balck spot on rose bushes).  I mix the powdered sulfur with my smoker fuel, and the resulting smoke kill the bees in the hive.  Tape up all cracks/bentillation holes, reduce the entrance, blow copious amounts of smoke into the hive, seal the entrance entirely, wait 24hours.
 
Not a pleasant task, but it does the trick and the equipment can be reused.
 
WARNING: mix the sulfur with your smoker fuel.  DO NOT dump powdered sulfur into a lit smoker (unless you  like the no eyebrows look).
 
Aaron Morris - I think, therefore I bee!

-- Visit www.honeybeeworld.com/bee-l for rules, FAQ and  other info ---