Robert Brenchley wrote:

> Allen Dick writes:
>
> <  Others worldwide are finding that in a few generations they can reduce the
> varroa
> <populations by 50% simply by selection from their existing stocks>
>
>     This is hopeful news; where can I learn more? If this is true, then
> either the bees are developing a degree of resistance,

The resistance is there in every population, just as resistance to foulbrood or
acarine mites or cold weather or ....   The trick is in the selection for the
stocks you want. These are not yeasts which mutate under habitat pressure to
become more resistant within a few weeks (I'm not even sure that statement is
true).
   - John Edwards, Tucson, Arizona