>
> >I could stand corrected on this and maybe some of the syrup remains for a
> while on
> top bars if the application is not done carefully.

Yes, it will remain there.  Bees appear to increase self grooming after
treatment.

I'm experimenting this spring with dribbling nucs shortly after the new
queens begin laying.  Doesn't appear to cause any adverse effects.

Re residues on the combs, would be easy to test by washing combs and
checking pH or acidity.  But maybe residues are good for prolonged mite
control!

I'm a big fan of oxalic dribble.

-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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