Bark removed from the basal trunk and root crown of a conifer exposing dark brown, resin-soaked wood and white mycelia of Heterobasidion root disease.

Bark removed from the basal trunk and root crown of a conifer exposing dark brown, resin-soaked wood and white mycelia of Heterobasidion root disease, <i>Heterobasidion annosum</i>. Credit: USDA Forest Service - Region 8 - Southern, USDA Forest Service, Bugwood.org<br />Licensed under a <a href=Creative Commons Attribution 3.0 License" />
Bark removed from the basal trunk and root crown of a conifer exposing dark brown, resin-soaked wood and white mycelia of Heterobasidion root disease. Credit: USDA Forest Service - Region 8 - Southern, USDA Forest Service, Bugwood.org
Licensed under a Creative Commons Attribution 3.0 License