@d0d5b8e6 

Maybe I’m missing something. 

The orchard mason bee will develop until the next spring so why removing those from the tube? especially that the male are first out of the tube and then the female will come out 15 days later. So there is a reason of the location and order in the tube… to ensure the fertilization and continuity of the species. 

 @12b2fd24 That is really good info. Maybe next year I will leave them. I’m just following the recommendations.