I have heard little about Oxalic Acid treatment for Varroa. Is it still
used in Europe?

Has there been any research into what mechanism is involved in Formic and
Oxalic Acid killing Varroa and tracheal mites?

It seems that somthing similar is involved in all the organic chemicals
used in varroa treatment- the acids mentioned as well as all the essential
oils.

The reason for the quaestion is that if the mechanism is known, then maybe
it will open up  more treatments.

Bill Truesdell
Bath, ME