"Robin Dartington" wrote:

> Prof Mark Winston, Simon Fraser University, has lectured in Uk showing he
> has reserched variation in the level of varroa that kills colonies
depending
> on level of virus.

I think that it was Brenda Ball who first suggested the link with viruses
and we have therefore known for some time that if there is virus present
then higher levels of varroa will cause more virus to be injected and
therefore more bees will die; I would suggest that would be a fairly obvious
assumption once you know about the link between varroa and virus.

Peter Edwards
[log in to unmask]
www.stratford-upon-avon.freeserve.co.uk/

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