Bob said:
> On a final note if we move to controls like formic acid gel (or even
liquid
> formic acid) the fumes will sink from the hive (heavier than air) through
> the screened bottom board without controlling varroa (reported at the 2003
> ABF convention by the makers of "mitegone " formic acid pads).

I had this concern about my thymol treatment when I started installing OMFs
last year.  However, initial results show 19% overall winter losses, but
only 9% on the OMFs.  I am not claiming any sort of scientific validity for
these results - too many variables - but I think that it does suggest that
there was not major problem with the thymol vapour being lost through the
OMFs.

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

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