Peter Borst quoted:


In 1917, A I Root describes explains using specific breeds to treat bee 
disease, that "a vigorous strain of bees would do a good cleanup job"

> Black and hybrid bees are much more subject to the ravages of European 
> foul brood. If the disease is not too far advanced, the mere introduction 
> of a vigorous strain of young Italian queens may cure the whole apiary.

This does not seem to hold true in the UK.  Here the SE, an area with 
predominantly Italian bees, has for a long time had the highest incidence of 
EFB.
Best wishes

Peter Edwards
beekeepers at stratford-upon-avon.freeserve.co.uk
www.stratford-upon-avon.freeserve.co.uk/

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