Cryptococcus fagisuga

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Cryptococcus fagisuga infestation on Fagus grandifolia (click on image to enlarge it)
Author(s): Joseph O'Brien, USDA Forest Service
Source: IPM Images

Cryptococcus fagisuga Lindinger - (beech scale)

This felt scale wounds beech trees through feeding in cracks of the bark on vascular tissue through the outer cambium. It predisposes the trees to diseases caused by Neonectria fungi and other agents. These are the "beech bark disease" in North America and the "beech bark necrotic disease" in Europe. It appears that both diseases are caused by various species of fungi in combination with various insects.

Vernacular names
• Deutsch: Buchenwollschildlaus
• English: beech scale
beech bark disease
• Español: escama de la haya
• Français: cochenille du hêtre
maladie corticale du hêtre

The scale is found in Europe, neighbouring parts of western Asia and in North America (invasive). The first record from North America is from eastern Canada in 1914. The suspected original distribution is eastern Europe and western Asia. In North America it attacks mainly American beech (Fagus grandifolia) trees, in eastern Europe and western Asia it is found on oriental beech (Fagus orientalis) and in western Europe on the common European beech (Fagus sylvatica).

Cryptococcus fagi

For details see the respective page in Wikipedia.