>I am in search of a reference about the efficiency of proventriculus in the
>extraction of pollen from the honey crop.
This paper gives a superb description of the action of the proventriculus and includes graphs and equations that describe the rate of removal of pollen and other particles. It also discusses Nosema.
Bailey L (1951) The action of the proventriculus of the worker honeybee, Apis mellifera L. Journal of Experimental Biology 29: 310-327.
http://jeb.biologists.org/content/29/2/310.short
There is a free PDF available as a link from that page.
cheers
Gavin
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