>Based on my experience the problems in spring
>brooding could come from overdose rather than the
>treatment itself.

Probably.

From what I understood, based on a study that OA
miticide effect is mostly due to low pH solution (and
not from oxalate salts as originally expected), OA in
solution is immediatly available and driBBled (I will
try to remeber the "BB") directly on varroas. In the
opposite, OA powder spread into the whole hive by
vaporizing is less "available" (depending on its
distribution in the hive; cluster position; moisture
available for OA dissolution). All the more as here we
use it with 2 langstroth brood chambers instead of one
european brood chamber. Just the hypothesis I
remembered.

Hervé






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