Diagnosis
A tree is diagnosed with this parasitic fungus once the following characteristics are identified:
- Resin flow from tree base
- Crown thinning or changing color to yellow or red
- Distress crop of cones
- White mycelial fan under bark
- Black rhizomorphs penetrating root surfaces
- Honey-colored mushrooms near base of tree in fall
- Affected trees often in groups or patches on the east side of the Cascades; usually killed singly on the west side.
A. solidipes may be confused with Mottled rot (Pholiota limonella). It has similar mushrooms, but only if mycelial fans are not present. Dead and diseased trees usually occur in disease centers, which appear as openings in the canopy. GPS tracking can aid in the monitoring of these areas. However, sometimes distinct centers will be absent and diseased trees are scattered throughout the stand.
Read more about this topic: Armillaria Solidipes