Over 40% of the bee colonies we tested in IL, IN, and NE had no corn pollen.   Neonic levels in pollen and bees, when found, tended to be at or just above instrument detection levels.  One lab found no detectable residues.  The second lab found levels of 1-2 ppb, with only occasional higher levels.
Our work is part of the documentation submitted to EPA as GLP field trials.  Over 500 pages of reports for corn and canola. 

In both studies, we tended to find higher levels of more traditional pesticides than the neonics.  Even on canola where bees  gather both nectar and pollen, we were surprised at how diverse the pollen samples were in terms of types of pollen in the samples.  And, the neonic residue data wasn't much different from on  bees on corn.
I have a 1 page pdf Executive Summary of the results.  Other field studies have tended to show similar exposure  patterns.  There's one exception in  
Saskatchewan, where levels of a well known neonic were 8 times higher than most global reports.

Jerry


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