>More specifically, I am curious whether that effect also applies to the
frozen drone brood put back in a colony when the beekeeper uses drone
culling to control varroa.  Do dead drones function as "bee juice" in this
context?

Mike, that would depend upon whether those drones were infected with
something.  So let's look at the potential pathogens:

Nosema--does not appear to infect pupae to any great extent (if at all), so
likely not a problem.

AFB or EFB, unless the drone brood appeared to contain dying larvae or
pupae, likely not a problem.

Prions--no telling, but let's not go there.

Viruses--these would be the most likely pathogens, especially if the drone
pupae had been fed upon by varroa.  In that case, there would be every
reason to suspect that cannibalism or removal of such pupae would transmit
the viruses.

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

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