ОКСАЛОВА КИСЕЛИНА

[m_pchelari]

Метод на действие на сублимирана ОК. Кондензация по вендузите на краката на акара.
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It seems that the vaporized oxalic crystals condense where it is moist, and that is at the sticky pads of the mites. All the pads have a buildup of oxalic acid crystals and the mites drop off the bees.

Those crystals disappear after about 2 hours and the mites are even able to crawl back up upon a bee. But: it seems the oxalic acids dilutes into the mite through that open channel right into the mite where it causes damage to the inner organs. So there are two effects: the immediate effect is the dropping (preferably through a screen bottom board out of the hive) and the second effect is the destroying of the inner organs of the mites. From the drop I'd guess that'll be one to three days after the treatment, probably there are longterm effects, too.

Bees don't get damaged much, although they too have a sticky pad at their feet. But there is a difference: bees can close that channel between the pad and the foot. There is a ring-like structure that can close down that channel. It is most probable - but not proven yet - that this is why bees don't get hurt much by the oxalic acid vapor.

Anyway, for us it is important to make the vapor circulating inside the hive for long enough, to make it condense at the mite's sticky pads. I reckon, dosage doesn't really matter much other than providing enough crystals to build up with type of vaporizer you have. The varrox vaporizer has been tested intensively and was found to be very effective. Other devices were not half as good. Temperature and other parameters will play into it. If you burn the oxalic acid and not vaporize it, there will be no buildup of crystals, just smoke.

http://www.varroamilbe.ch/bericht3.pdf

http://www.varroamilbe.ch/Abstract_E...rroa-mites.pdf