there are a couple of threads in the sci.agriculture.beekeeping newsgroup
that may bee of interest...best followed using remarq links:

http://www.remarq.com/read/4586/qA3H3jnmE7AwC-yMg#LR

http://www.remarq.com/read/4586/qA0yLMte3URQC-yMe#LR