>I don't think we (as an industry) have enough hands-on experience to be
able
to judge the "success" of a solitary bee population.

When I asked the question: 'Who is monitoring the solitary bees?', I was
told that we do not even have the ability to identify most of the species -
perhaps 250 in the UK alone - let alone monitor them.

Best wishes

Peter 
52°14'44.44"N, 1°50'35"W

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