Re: Plastic-tube house for Mason bees?
Personally I think it's good to set out a variety of housing for solitary bees just to see which kinds they prefer in your area.
After your first year you really should at least inspect a few tubes to see what kinds of problems you might be having in your location. Paper liners/tubes or take-apart trays will make that easier. One thing I do know is that all plastic tubes (like plastic drinking straws) don't breathe much and the bees don't like them as well as wood, paper, natural reeds,or cardboard housing tubes.
You guys should be posting this in the forum for 'Alternative Pollinators":
That's where we have all the discussions about mason bees and such....
Try asking your questions there since some folks watch for mason bee threads there.
The little bee returns with evening's gloom,
To join her comrades in the braided hive... -Tennyson