>I run Freeman type bottom boards......I can now treat with OA from the rear of the colony....... it avoids all the bees I used to encounter trying to >slide the vaporizer in the front entrance...... 

What a great idea!  I have the same style SBB with trays but mine are on top of solid bottom boards that are reversed (helps, I think, for the long winters up here), so it will be even easier for me.  I JUST bought an OA vaporizer and will be using it for the first time in another week or two.  This sounds like a simpler approach for my set up.

BTW, I do something similar for flash formic acid treatment, just soaking a couple of folded paper towels and placing them in the tray under the SBB.  Really easy and no need to open the hive.

Thanks!

Bill

Claremont, NH

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