If you look at the back of the leaf you will see black specks. These are fecal droppings. The insect feeds from the back but the damage is most often visable from the top.

Bugs aren't just another word for creepy critter. Bug is a description of a particular type of insect. Some are leaf eaters, some are leaf sucking and some are predators. Lace bug is the second type. They are small shield shaped insects that come up at night and suck the juices out of the foliage. In our area the prevelant Lace Bug especially likes Photinea and some close relatives including Indian Hawthorn and various Prunus.

Beyer advantage is one method of control. Come in with some samples for a positive diagnosis.