>Here's how Pettis described the phenomenon, according to The Guardian's 
>account:

>This is a novel finding, and very striking. The implication is that the 
>bees are sensing [pesticides] and actually sealing it off. They are 
>recognizing that something is wrong with the pollen and encapsulating it 
>... Bees would not normally seal off pollen."

Can this be correct?  How many cells are we seeing sealed off.  Surely if 
the bees were working a contaminated crop then they would entomb all of it - 
whole combs; is that what is being seen?  And if they are able to detect the 
problem, why do they collect it in the first place?

Best wishes

Peter
52.194546N, -1.673618W 

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