Thanks for the references, Bil

persistence of synthetic acaricides ... has led to the
increased use of alternative control measures
with non-toxic substances such as thymol and
organic acids.

Oxalic and formic acids are natural honey
constituents, widely used in the frame of alternative
V. destructor control. They have a
GRAS status (Generally Recognised As Safe)
and the establishment of a MRL is not necessary

Long-term use of formic acid, applied
according to the prescriptions, does not lead to
an acid increase, but if used during the honey
flow, residues might be high enough to change
the honey taste (Bogdanov et al., 2002a).

Single or repeated treatments with oxalic
acid do not lead to accumulation of residues in
honey 

The results summarised in this section show
that Varroa control with natural acaricides like
organic acids and thymol is a good alternative
to treatments with synthetic substances.

Contaminants of bee products
Stefan BOGDANOV
Apidologie 37 (2006) 1–18

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