Hello Dick & All,
.Osmia lignaria don't like to nest in old holes in blocks. A good thing as
parasites build up fast in holes reused.
Sincerely,
Bob Harrison
Odessa,Missouri
Dick wrote:
The first year I had around 25 holes filled and then last year nothing...
I will continue trying this year since you need to build up the
population and continue to add move nest holes each year.