Hard scales are stationary, sucking insects that secrete a waxy covering over their bodies and looks like a plate of armor. They are round or oval in shape and can also be domed or flat.
There are several species of hard scales affecting many types of trees. Scales pierce the plant, suck out the nutrients and cause the plant to gradually decline in health/appearance. It is important to look for he presence of scale on a stem, leaf or twig. Another common sign of scale is a sticky secretion that will be on objects beneath the tree.