Ms. T-K,

?  Perhaps I missed some vital prior discussion, however is that not making a pretty large leap?   Presuming or assuming the reason for some pollen remains or residue on a the leg of a forager is Nosema?   It is not uncommon to see foragers roaming the frames with a pollen load as they have not yet met up with the appropriate house bee to transfer their load to.    

Steve Petrilli,
Central Illinois

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