Biscogniauxia nummularia

Beech tarcrust

The black circular shapes are 0.5 - 2 cm wide, called stroma. They have a carbonaceous consistency, are dull on the surface, and can be dusted with brown conidia when young. Inside this black tree are submerged fruiting bodies, which penetrate the surface through a small hole through which spores enter the environment. On the surface of the branch or trunk are formed in large numbers.

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Symptom

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The black circular shapes are 0.5 - 2 cm wide, called stroma.

Tree Species: Beech

Part of a plant- attacked: Tree trunk

Pest significance: Less harmful

Pest Category: Fungi

Invasive Species: No

Present in EU: Yes

Pest group: Fungi

Affected part of wood: Heartwood, Sapwood

Depth of damages: More than 5 cm depth, Under bark only, Up to 0,5 cm depth, Up to 2 cm depth, Up to 5 cm depth

The extent of damage: Whole trunk

Prevalence in Europe: Very common

Damaged products: Firewood, Fresh timber logs (water still in the sapwood), Furniture, Lumber, boards and prisms, Wood chips, Wooden house constructions

Roundwood size: Diameter 50+, Diameter from 10 up to 50 cm

Wood discoloration: Yes

Pest subcategory: White-rot