Peter Borst quoted:
> ...the main source of bee glue is the resinous exudate of the buds of 
> poplar trees, mainly the black poplar Populus nigra.

I do not understand how the propolis comes from the buds.  The poplar 
flowers in April, but the main collection time for propolis is the autumn.

Are these flower buds?
Best wishes

Peter Edwards
beekeepers at stratford-upon-avon.freeserve.co.uk
www.stratford-upon-avon.freeserve.co.uk/

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