Charlie, no person or industry makes changes until doing things the
"regular way" no longer works or until a "new way" is obviously more
profitable.  I do not expect change until amitraz starts to fail wholesale.

That said, what I'm talking about are biological and economical
possibilities.

>But those colonies  are workers and the drones which manage to be
seemingly very successful before they die.

The workers do not pass their genes on to subsequent generations.  No
reason to let them die.  And if one requeens each season with resistant
stock, then all drones the next season will have all come from that
resistant stock.

>How do you account for that since many of our hives are superceded on a
fairly regular basis??

I don't understand your question...

-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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