Magnolia scale on star magnolia trees. Notice the drop of honeydew about to fall from the swelling female on the right. Dark patches on the trunk are sooty mold growing on the honeydew.
Tuliptree scale on tulip popular. This scale also produces copious amounts of honeydew and looks very similar to magnolia scale. Microscopic investigation reveals which species. Crawlers are active for both species about the same time and scouting is crucial to know when they are active. Use GDD to target ideal scouting times.
The white waxy insect in this picture is a lady beetle larva feeding on the adult scales. All pictures were taken by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware