This just out!
Accelerated Varroa destructor population growth in honey bee (Apis mellifera) colonies is associated with visitation from non‑natal bees
... results do not support the current two leading theories regarding mite immigration – the “mite bomb” theory or the “robbing” theory ...
https://www.nature.com/articles/s41598-021-86558-8
PLB
thinking, heads will roll now!
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