Concerning use of temperature to control varroa, Aaron said "Raising
temperature is also not  a practice that lends itself to a lot of hives.
The practice was abandoned as effective but impractical early on in the
varroa crusades."

One researcher, Zachary Huang, at Michigan State, has not given up and has a paper published in the October, 2001 issue of the American bee Journal.  He reports extremely good success by:

1.  Using drone foundation to attract mites
2.  Using a portable power unit to attach probes to the cross wires in the drone foundation and quickly (10 minutes) raise the temperature enough to kill the mites.   

You can judge for yourself, but I fail to share Zachary's enthusiasm and think that freezing drone brood is more practical and just as effective.  


Lloyd
Lloyd Spear, Owner of Ross Rounds, Inc.
Manufacturer of round comb honey equipment and Sundance pollen traps