Robert,


> Does anyone have experience of mason bees (Osmia spp)? I'm aware that trap
> nests are commercially available, and that they can be used for
> pollination. I'm interested in using them at an urban site in the UK

You could check the website www.beediverse.com  for much information
regarding mason bees as well as nests and  other product information.

Jaquie Bunse
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