Bob asked:
> Does the smell linger in the box or dissipate quickly?

It is very pungent and you need to be very careful if doing a large number 
of boxes on a still day as the fumes can be overpowering.  However, the 
smell disperses quite rapidly and, surprisingly, does not seem to put bees 
off - I have had a swarm move into a couples of boxes that were at the end 
of their one week treatment but which I had not opened up to air (they found 
a gap between the boxes).  I was amazed that they could cope with the 
remaining fumes, but they seemed quite happy!

Best wishes

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

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