What is scale?
Sap-sucking pests that attach themselves to leaves, fruits and branches of trees, shrubs and other perennials. Many species cover themselves in waxy or wooly substances as a protective cover. Unless the infestation is pervasive, they can be difficult to see.
How to Diagnose the Problem
Look for unusual bumps on a stem or leaf, sticky residue on leaves or the presence of sooty mold, yellowing leaves or dead branches. Scale can be found on euonymus, palms, pine, maples, oaks, burning bush, magnolia, pachysandra, ivy and ferns. They are active April through October.