James C Bach:-
> I would need the whole text of the UK label to say for sure but I'm
thinking
> that if it says: "The strips should be left in the colonies for a maximum
of
> six weeks and then removed," it does not mean they can be used in hives
(or
> supers) without bees.  The intent of the label is to treat bees with mites
> not combs nor moths.
>
> I interpret Bayer's statement (if made in the form of your statement "for
> the diagnosis of severe infestations the product may be used at any time)
to
> mean that the strips may be used in the brood nest for several days with
the
> use of a Varroa trap or sticky board for mite detection purposes.

UK Apistan labels make the following statements:-

"Treatment duration is 6-8 weeks after which time the strips are removed and
disposed of. The strips should not be removed from the hive for at least 6
weeks. Do not leave the strips in the hive for more than 8 weeks. The
treatment period should be kept as short as possible in order to reduce the
likelihood of trace residues in the broodwax and to avoid the development of
mite resistance."

"Use strips for one treatment only; do not reuse strips.
Dispose of used strips safely by wrapping in paper and placing in domestic
refuse.
Do not contaminate ponds or streams with product"

"Apistan efficiency is maximised if used in late summer and after the main
honey harvest (when the amount of brood is diminishing). However, in the
case of severe infestations Apistan can be used at any time of year"

Personally, I would be wary of any supposed effect of used strips on wax
moths. They would have to come into contact with the strips, and I doubt if
they have the same degree of contact between individuals that bees have for
the transfer of the active ingredient. It never ceases to amaze me the
extent that beekeepers will go to  save a few pennies, when there are fairly
cheap and proven remedies available!!