Virtual Herbarium

of Forest Diseases

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Heterobasidion annosum (Fr.:Fr.) Bref.

Heterobasidion annosum fruiting bodies. It can be also observed the great amounts of spores produced by Heterobasidion annosum fruting bodies.
Usually Heterobasidion annosum fruiting bodies appear to be very hidden, due to this, the presence of the pathogen can be easily undetected.
Recently cut trees are easily infected by Heterobasidion annosum spores.
Pathogen spores also infect fresh wounds, like in this case, in which the tree was injured by the construction of a road.

Although trees are cut, their stumps can still keep growing. This occurs because the roots in forest are interconnected. As a result, from an infected stump or tree, Heterobasidion annosum is able to colonize the roots of surrounding healthy trees. 

Dominant layer windthrown tree. Most of its roots were previously decayed by Heterobasidion annosum.

Broken tree in an advanced decay state, showing Heterobasidion annosum fruiting bodies.
White fibrous and dry decay of wood produced by Heterobasidion annosum.

Advanced decay. Heterobasidion annosum rot has probably raised from roots.

Heterobasidion annosum conidiophore.

Heterobasidion annosum conidiophore.

 

 

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This web page (http://labpatfor.udl.es/herbariovirtual/heterobasidion2.html) has been created by:

Carlos Colinas y Jonàs Oliva
Vegetal Production and Forest Science Department
University of Lleida

Last update: January 25th, 2005