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Leaf Cutter Bees -- Preferred Hole Size = 3/16"

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joseph:
There is an old wooden chicken coop near one of my fields which is highly favored as a nesting site for leaf-cutter bees. This summer I conducted an experiment to see which size holes they prefer.

A month or so ago I installed a board into the building, right next to the door, into which I had drilled holes of many different sizes. The only species that has nested in the board so far are leaf-cutters. The bees hatch about the time sunflowers bloom, so I installed the board just before they hatched in the third week of July...

The bees occupied holes ranging in size from 1/4" to 5/32". The first hole occupied was 11/64". The most preferred hole size was 3/16" and anything between 5/32" and 7/32" had good occupancy rates.

Here's what the data and experiment looked like:

Preferred Hole Size: Leaf Cutter Bees in old building in Cache Valley


Experimental Design:

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