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Lepidosaphes ulmi

Insect
Lepidosaphes ulmi also known as apple mussel scale or oystershell scale is a widely invasive scale insect that is a pest of trees and woody plants. The small insects attach themselves to bark and cause injury by sucking the tree's sap; this... Wikipedia
Scientific name: Lepidosaphes ulmi
Order: Hemiptera
Family: Diaspididae
Size: a 1/8th of an inch