> I am curious to know what is legal to use in Western European countries
...

In Belgium, we use Thymovar or Api Life Var for control in July and August,
these are the only legally authorized products at that time. In winter, we
apply di-hydrate oxalic acid but the approval of a veterinarian is required.
We hope that an Italian product, Api-Bioxal, will soon be approved in our
country (for more information, see:
http://www.chemicalslaif.it/page/02_prod_gruppi.asp). This is already
possible in Ireland. Biotechnical methods are used in spring.
I have to say that other rules apply in other European countries, see:
http://www.vmd.defra.gov.uk/public/bee_europe.aspx.

Kind regards,

Ghislain De Roeck,
Belgium.
50°45'14"N
 3°54'48"E

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