> not discounting natural drop.  See my recent article in ABJ about the correlation 
> between the two.

I looked ion your site and found this.  Since the articles are not dated, or noted as
to publication,  I am not sure if this is it.
http://scientificbeekeeping.com/sick-bees-part-10-parasite-monitoring/

I discussed my own most recent drop experience here:
http://www.honeybeeworld.com/diary/2009/diary092009.htm
See Sept 26.  

>Did you start out with nucs or packages from the beekeeper?

They were splittable doubles and I split the nine up to 38, then combined down 
to 28.

> But in my experience, not to the point of zero natural drop in October.

After the first 24 hours with zero, I found six today after the second 24.

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