Doesn't PDB leave a residue in wax? A safer way of using sulphur, if there
are concerns, might be to use sodium metabisulphate, used as a presevative in
wine. a concentrated solution left in the roof of a sealed-up hive overnight
would probably produce enough sulphur dioxide to kill them, especially if a
little acid was added.
Regards,
Robert Brenchley
Birmingham UK
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