|Earlier in the spring, Mason Bees chewed their
way out of their cocoons, leaving the cocoon hulls.
|Remove Release house and examine
cocoon hulls inside.
When only a few mason bees remain active at the nest it is time to remove cocoon hulls. Nest tunnels have been filled over the past month or so, and pretty well all activity is at or near its end. Cocoon hulls may contain developing parasitic wasps and wasps can destroy a lot of newly developing cocoons.
|Empty cocoon remains from the emergence
box to a transparent container, like a petridish.