The latter confirms earlier studies assuming that Varroa invasion is
triggered by cessation of the nectar flow in late summer and the subsequent
increase in robbing among honey bee colonies. 


This makes no sense to me.  I have seen it reported before,  but it defies
logic in my mind, Suddenly mites are coming form other hives via drift,  but
why are you not also loosing mites via the same mechanism?  Seems to me that
normally the mite population on any given day is stable.  So for me to gain
has to mean that all the other bees are traveling to me,  and mine are not
doing the same thing?
I would understand if a nearby colony was collapsing and some foragers were
looking for a new home,  but that's not a typical fall issue?

Altruistic bees with mites intentionally invading other hives??

I am not following this logic,  anybody that can help?

Charles

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