ENTFACT-433: Oystershell Scale | Download PDF
by Lee Townsend, Extension Specialist
University of Kentucky College of Agriculture
Oystershell scale is a common armored scale that can infest more than 100 plant species. Among the common hosts are lilac, ash, dogwood, maple, and willow. Males and females are about 1/10" inch long and resemble oyster shells. Their drab, bark-like appearance makes them easy to overlook, even on close inspection. Heavy infestations can kill twig or branches.