> Newbees should know that comb rotation is an essential part of beekeeping.

Comb rotation is pretty well unavoidable.  I always added 10% new foundation
every year, and that was about ideal IMO.  If I were using Checkmite+ or
other such toxins, I'd know I should double that rate, but I also know I'd
be risking a cost in terms of production *in my area*.

> http://www.ent.uga.edu/bees/Publications/effects_comb_age.pdf

Thanks.  Nice reference.  Pretty well confirms what I already figured.  When
I look at a study like that and figure in the economic realities of
commercial beekeeping, I still get the same answers.

allen

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