>I do use it as a stand-alone treatment and have seen no issues to date. I listened to our friends in the EU who have been using it many years longer that us and the only reports i have seen from them is that it is fairly benign, especially compared to other treatments, and I agree.

A few years ago I deliberately overdosed a nuc with a double dose of OA vapor for 5 straight days. Examination of the nuc at 7 and 14 days revealed no problems with the brood, queen or the hive in general. I don't worry about digestive problems or other issues as I have never seen it in my hives. Been using OA vapor for about 10 years.
Cam bishop

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