Scale
A small bract or leaf-like covering of a flower or leaf bud.

Scale insects have piercing-sucking mouthparts that are inserted into leaf veins to draw out plant sap. Feeding can cause twig dieback. Severe infestation may kill major limbs. Some are cottony as in the common mealybug.

Additional Information
Scale Insects of Trees and Shrubs - University of Minnesota Extension Service

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