Yellow spotting or banding caused by Cryptomeria scale.
Ants attracted to the honeydew produced by Tuliptree scale (soft scale).
Magnolia scales on Star magnolia (notice the scale in the upper right corner has been chewed open by a beneficial insect–probably a lady beetle).
Holly infested with white prunicola scale. All photos provided by: Brian Kunkel, Ornamentals IPM Specialist, University of Delaware.