In a message dated 2/18/00 12:18:58 PM, [log in to unmask] writes:

<< Whilst we cannot comment on their effect on varroa, there appear to be
no adverse effects on colony development and possibly even a benefit in
wintering. >>

   But do we know what effect these screens have on small hive beetle access
to the colonies — How would SHB infestation (and treatment) be effected? I
imagine SHB will probably find its way into a hive no matter what, but a
screened bottom sure seems like an open invitation.
   Past history of use in countries where the SHB doesn't exist may not be a
reliable indicator of whether, on balance, open-screened bottoms are a
liability or an asset where the SHB exists.
   It seems that placing a screen over a regular bottom board will allow an
area to treat the SHB without any possibility of contact between Comophous
and the honey bees. Likewise, if a product like Bee 401 (manufactured in
France) — Bt type K for control of wax moths — was applied in this area then
it would essentially become a trap for wax moths, too. Perhaps this screened
off area where the bees can't access could be baited with comb that would
attract honeycomb pests that could be treated there without fear of hive
contamination.
John