I am trying to raise native tube dwelling bees. I have opened my tubes from...

Asked March 9, 2015, 2:13 PM EDT

I am trying to raise native tube dwelling bees. I have opened my tubes from last fall and found probably mason bee cocoons. They are silky fiber sacks, lots of frass and pollen remnants, mud plugs and dividers. The tubes are Phragmites reeds about 5-7mm diameter. In 2 tubes there was something different. These cocoons looked like shiny, dark wooden pegs with slightly wider, rounded tops. The plugs looked like muddy sawdust, lighter than the mason mud plugs. There was not much frass. I hope these are also beneficial pollinators? thank you

Montgomery County Pennsylvania identification mason bees cocoons

1 Response

We cannot identify the cocoons but here are some suggestions.

Contact your extension for more information and perhaps you can send them a sample. http://extension.psu.edu/montgomery
Or you can wait and see what develops. Put the cocoons in a screened cage outdoors in a protected location and monitor for development.
mh