Michael Palmer wrote: 

> Why? I would think that Varroa would have a hard, if not impossible 
> time becoming resistant to the acidity of OA.
> Mike

Hi Mike,
OA, used once each fall/winter in rotation with other treatments, will 
likely be effective for a long time. 
Unfortunately, there are those using OA vaporization on a regular basis 
throughout the year, and as their sole varroa control.  I would not be 
surprized if their mites eventually develop acid resistance, which would 
be very unfortunate.  As Bill says, we will likely see it first in 
Europe.  I suggest that OA not be used as a "silver bullet," but rather 
as one component in an integrated varroa control strategy.  My upcoming 
articles will address this.
Randy Oliver

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