Supercedure is not as common as some would have you believe.   We see about
5%  and they are usually successful.  If you destroy the supercedure cells
the queen is usually just fine,  they are trying to supersede her due to a
lack of brood pheromones.

They 3rd option of which you speak is costly and difficult,  and was
especially so back when those were written.  You need southern yards, food
for the bees,  and someone to work them as well as transport fees.

Those who do travel south will tell you,  its not as easy and profitatible
as it sounds.  Without the huge fees from almonds it would be even rarer
than it is.

Charles

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