Inonotus Root and Butt Rot

Yellow-orange conks with droplets (weeping conks) appear at the base of Oregon white oak, indicating decay in large roots and the lower trunk. Pseudoinonotus dryadeus enters through wounds and causes slow internal rot. Avoid wounding with equipment, inspect for decay regularly, and remove unstable trees to prevent windthrow damage.

Irrigation water, especially from sprinklers, should not wet the trunks. Mowing equipment should not injure the roots, crown, or lower trunk.