> And, how do you suppose they would know frost is coming in six weeks?

Not that they know the frost is coming in advance, but that they 
graduate to become foragers at a time when there is nothing to forage 
for.  I don't mean to imply that they are bees that will live through 
the winter, but that they won't work themselves to death foraging (at 
least the nectar and pollen foragers), and on that logic live longer 
into winter, overlapping at least at the beginning of winter with the 
diutinus bees.  It makes sense to me that these bees need to be raised 
healthy too, which means for me a mid summer mite treatment.


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