|Date: Fri, 7 Feb 2003 19:18:54 +0200
From: komppa-seppala a t
Subject: Re: [BEE-L] how to fight varroa with organic acids
Allen dick wrote
> Aren't we all? Chemical residues are
definitely something to be worried
> about. I understand that oxalic and formic do not leave noticeable
> residues, but I had heard that thymol can get into honey enough to be
> tasted? Have you observed that?
> Have these treatments affected your honey yields or wintering at all,
> have you studied that aspect of this approach?
> From my experience I would say that everything
we use for varroa treatments
> ends up in small amounts sooner or later to honey. Formic acid
> raise the amount of it in the honey. From Central European results we
> that the natural amounts of formic acid are very high in some honeydew
> honeys and the varroa treatments don't raise the amount of formic acid
> near these natural figures.
Oxalic acid has not had so many residue studies, but we can say that the
residues are very small.
Thymol was a problem in the beginning in Switzerland and Germany when
beekeepers just poured chrystals into hives. About the same way as
used in the USA. If you have thymol treatment in the hive during the
you can get residues that you can taste. We only recommend to use it in
fall once for about 3 weeks or whatever it takes to evaporate. We simply
the thymol in water bath and pour 12 g for 5 cm *15 cm wettex ( a
kitchen cleaning cloth). One strip for hives with one box and two for a
with 2 boxes. Even this kind of short use leaves some residues ( from
summer we could detect residues in about 50 % of samples) but these are
% from the level detected by human senses. The residues don't increase
year to year as they do with synthetic chemicals. Thymol is used in some
and soft drinks. Its also the main component of Apilife VAR varroa
As I told before all these three are also natural ingredients of honey.
Overdoses kill bees, but when used according to recommendations we have
few problems. Thats why we have had the normal beekeepers to accept so
this way of varroa treatment.
Ari Seppälä MMM
Projektipäällikkö Project Manager
Suomen Mehiläishoitajain Liitto r.y.
Finnish Beekeepers' Association
komppa-seppala a t