Mason bee se-up while pollinating cherries.
Mason bee nests are made of routered channels cut out of compost board.
Boards are held together with a tie-strap.
Osmia rufa doing the finishing touches to her nest.
Osmia rufa male. Note the long antennae.
Females resting over night inside their nesting tunnels. Embrace (Osmia rufa)Fierce competition
For the second year in a row, I have had mason bees nesting in these tiny nesting cavities. These tiny cocoons are similar in colour as Osmia lignaria cocoons, but much smaller in size. I have not seen this small bee fly, so I do not know what they look like nor do I know what time of the year they appear. If you have a piece of corrugated plastic, set a piece in amongst your other nest materials and see what happens.
Here is the Highrise with nesting trays (without the cedar roof). The gap above the nesting trays is where I insert the folded plastic corrugated material and use it as a wedge to securely hold trays in place.
The spring mason bee cocoon is on the left (with its nesting trays on the far left). The tiny summer mason bee cocoon is on the right.
After slicing the nesting tunnel open you can see how the tiny cocoon fits into the tiny nesting tunnel.
Closeup of plastic corrugated sheets filled with mud plugs.