>I treat with OA Vapor once in spring, once if I split hives. 3x5 in August
and October and once in November. 

Bill, Does that add up to 9-10 total with no observed ill effect? 

The idea that the trouble could be coming in with even mite free bee immigration opens a whole new can of worms. Thanks for even more sleepless nights.

Paul Hosticka
Dayton WA

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