Forest Services

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Heterobasidion root disease (Heterobasidion spp., formerly Annosus root disease) is one of the most impactful diseases of conifers in the northern hemisphere. H. irregulare is found in the eastern half of the US, including in Maine on white pine and red pine and may occur on other coniferous and deciduous hosts. The fungus typically enters the tree through a wound and grows into the heartwood and roots causing extensive decay. Infection by H. irregulare makes trees highly susceptible to windthrow and low stem and root breakage. The fungus easily infects stumps after harvest and requires special forest management practices to prevent serious stand impacts.



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