Until I'm corrected, I use "tolerance" for colonies that don't get sick, despite having high levels of varroa.  One potential mechanism would be to be vertically infected with DWV-B, which may allow them some degree of immunity to DWB-A.

To me, "resistance" is the bees' ability to retard the rate of reproductive success of varroa, such that mite populations never build to damaging levels in the hive.  Thus, viruses would no longer be an associated issue.





Makes perfect sense,  the question to me from a practical stand point,  on both issues is the Number,    Are they tolerant from say zero to 20%?  

Same with resistance,  does that then they need to stay below  threshold defined as X,  after  say a set time period with no brood break??  Seems to me right now anyway,  we have quite a few that claim resistance,  on hives that are young,  or have had brood breaks,  either  re-queened,  or queens stop on their own.

A common definition from an industry standard would go a long ways.


Charles

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