>
> >Any advice about the most appropriate inter-apiary distance to use for
> Varroa transmission would be appreciated. NB – this is transmission
> facilitated by robbing, swarming, absconding, not human traffic in live
> bees or hives.
>

Tibor Szabo (1986) in Alberta found that:
Successful matings at up to 10 km distance were common in our experiments
[and some apparently up to 20 km]. At greater distance cross-matings were
very rare and probably would not happen in
nature if drones are plentiful. Therefore isolation distances of 18-25 km
used in our
closed-population breeding programme (Szabo, 1979) may be considered
adequate.


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

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