Ever wonder what makes those perfectly round holes in rose leaves? Looks kind of like a giant hole punch. That’s the work of a leaf cutting bee – a solitary bee that lines a hollow stem or other tube with leaf pieces for it nest. They make several chambers, each with an egg and a food supply for the developing larvae. They are also important pollinators of plants, so we should consider them a very beneficial insect, and the holey roses a decorative feature.
For a more complete description of their biology and habits, check out this page in the online Field Guide to Common Texas Insects.
Here’s a video of it in action