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Spruce trunk with reddish decay caused by Heterobasidion root disease, Heterobasidion annosum.

Spruce trunk with reddish decay. Credit: Andrej Kunca, National Forest Centre - Slovakia, Bugwood.org<br />Licensed under a <a href="https://creativecommons.org/licenses/by-nc/3.0/us/">Creative Commons Attribution-Noncommercial 3.0 License</a>
Credit: Andrej Kunca, National Forest Centre - Slovakia, Bugwood.org
Licensed under a Creative Commons Attribution-Noncommercial 3.0 License
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