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Heterobasidion root disease

Heterobasidion irregulare
What is this?

EU phytosanitary regulation

Foto: Natural Resources Canada
Trosnjak na borovem panju. Foto: Dusan Jurc
Trosnjak. Foto: Dušan Jurc
Podobna vrsta, borov trohnobnež (Heterobasidion annosum). Foto: Dušan Jurc

NATIVE RANGE: North America

FIRST FINDING IN SLOVENIA: not yet found in Slovenia

PATHWAYS: transported with infected wood, secundary spreadying also with wind and insects

POSSIBLE TO FIND: year-round

DESCRIPTION: The fruiting body is flattened, initially hemispherical, elongated, multi-annual, 1–30 cm wide. The upper layer is uneven, first reddish-brown, later on turning darker. With age, it eventually becomes black and only the growing edges maintain a white colouration. The hymenium on the underside is initially white, later off-white to yellowish-brown and has round or strongly elongated, irregularly-shaped pores (7.3 pores/mm2). In cross-section, the fruiting body shows several distinct layers.

HOST PLANTS: Infects coniferous trees. It rarely forms fruiting bodies on live trees, but often on tree stumps of infected trees and on dead or cut trees.

STATUS: Present in an area of about 100 km around the shore of Tyrrhenian Sea in Italy.

SIMILAR SPECIES: Three related fungi cause root diseases in Europe: Heterobasidion annosum, H. parviporum and H. abietis. They can be identified with a detailed investigation of their morphological characters (number of pores per mm2, the composition of fruiting bodies, shape of the edge, presence of hairs) and molecular techniques.

SOURCE: Field Guide to Invasive Alien Species in European Forests

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