>>One reason some Amm strains can be runny is  that driving was widely practiced in the UK during the last couple of  generations of skep beekeeping. Bees that wouldn't run would have been  sulphured, so in some areas there must have been considerable selection for  runniness.

I have never heard of bee running (with smoke?) in the area.  My uncle's selection criteria are productiveness, good overwintering, and disease resistance.  Runniness is not a big deal to him.  I only noticed it because I don't see it in my bees.

Thank you.

Waldemar  

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