About Lepidosaphes ulmi (Linnaeus, 1758)
The species, scientifically named Lepidosaphes ulmi (Linnaeus, 1758), is commonly called apple mussel scale or oystershell scale. It is a widely invasive scale insect that acts as a pest affecting trees and woody plants. These small insects attach themselves to plant bark and damage the host plant by sucking its sap. The metabolic drain this feeding causes on the plant can end up killing an individual branch or the entire tree.