Over the past many years, I usually find a few Varroa in drone cells.
This August  found none.

Last year, because of my health problems, I had let my bees fend for
themselves, so that last fall, when I had help from Tony Jadczak, I
applied the OA drip method. I had four colonies and all had heavy
Varroa. One was so far gone that it died just after the treatment. Tony
was not sure if the others would make it through the winter, much less
the fall.

The other three came thought the winter fine and, as noted, appear to be
Varroa free even now. All had a nice surplus and are loaded with bees.
There was another local beekeeper who used Oxalic under more controlled
conditions to see if it was effective and the results were the same. It
works.

OA is cheap, simple to use, and effective so I can understand why it is
used in Europe. It would be nice to see it registered in the US and Canada.

Bill Truesdell
Bath, Maine

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