a Peter Loring Borst snip...
The presence of aflatoxins in the diet of bees may cause high mortality even at concentrations below 5µg g-1. Aflatoxins act directly on the central nervous system, affect the endocrine system, and compromise the internal defense system of bees, while reducing resistance to mycotic infection (Gliński and Buczek, 2003). Hilldrup et al. (1977) verified the production of aflatoxins in low levels in samples of pollen, honeycomb (nest), larvae, and adult bees, except in unprocessed honey.

my comment...
I did find this snip interesting in that aflatoxins are something that can be found in corn and at least in my own observation bees will forage for pollen on corn tassels.  

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