In a message dated 30/11/2008 23:24:20 GMT Standard Time,  
[log in to unmask] writes:

If the  bees are short of good quality  pollen, and  
if the bees collect  corn pollen in its place,  than perhaps we might propose 
that the  difference is simply a  substandard diet?



Perhaps the problem is caused indirectly by the use of broad leaf  herbicides 
that eliminate nearly all plants except the desired crop.  This  leaves the 
bees (and all other pollinators and creatures that live off them)  with nothing 
but the farmer's crop for sustenance.
 
Chris

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