Bob Harrison wrote:

> I only wish to make the list aware of the limitations of the chemicals which
> will be available now that we are moving into a new era of control of varroa
> by chemicals which *are* temp and humidity effected. All the acids and
> thymol and  fall into the class.

Oxalic is limited down to about freezing, so it is not really limited.
Which makes it a good choice since you can apply it in the north when
the colony is broodless. But it has other drawbacks, depending on method
of treatment.

Bill Truesdell
Bath, Maine

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