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Woolly beech scale

The woolly beech scale is a scale-insect that lives on and from beech trees.

Also known as:
Beech scale

Colony of woolly beech scales on trunk of beech, photo: Joseph O'Brien - CC BY 3.0 us

Woolly beech scale (Cryptococcus fagisuga), scale-insect that lives on and from beech trees. This scale-insect, which is slightly less than one millimeter in size, is yellow in color and has a layer of wool-like wax on its back.
The woolly beech scale is harmful because fungi can enter the beech through the holes made by the scale-insect.
Sometimes a beech so colonized by the woolly beech scale that the trunk looks white with wax. Colonies of woolly beech scales occur only on beeches thirty years old and older; young beeches know how to repel these scale insects by producing antibodies..

Where to find

Control

Difficult to control.

Prevention

Does not apply.