Annosum Root Rot - Symptoms & Signs
Crown symptoms typically appear 2-3 years after a thinning. Infected trees will have thin crowns, reduced height, diameter, and shoot growth. "Infection centers" develop as the disease progresses and may contain one to many dead trees surrounded by recently dead or dying trees.
Compare the Pests
Annosum Root Rot and Red Pine Pocket Mortality share many characteristics. Learn how they are different.
Symptoms
Crown die back - one symptom of Annosum root rot
WDNR Photo
Fading and dead trees may have fruit bodies (spore-producing structures) in the root collar area. These are often so low on the tree they are buried among soil and fallen needles. Young fruit bodies appear in mid summer and look like popcorn. By fall, they are bracket-shaped - reddish brown on the top and white on the lower surface. Fruit bodies are perennial yet undergo partial deterioration each year.
Thumbnails link to larger images.
- Popcorn stage of Heterobasidion annosum fruit body, typically seen in summer. WDNR Photo
- H. annosum fruit body in the fall WDNR Photo
- Underside of H. annosum fruit body. WDNR Photo
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