ForesTree - Detail Information

Pest and Disease Information

* Natural Resources Canada Heterobasidion_annosum
* annosum_root-disease-pocket
Affected Trees:
Bigleaf Maple, Black Oak, Red Fir, Giant Sequoia, Incense Cedar, Jeffery Pine, Monterey Pine, Sugar Pine, Gray Pine, Ponderosa Pine, Lodgepole Pine, Coulter Pine, Knobcone Pine, White Fir and Madrone.

* Complete Image Citations:
- Image #1: Natural Resources Canada
- Image #2: Donald Owen, CDF -

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Heterobasidion annosum
Annosus root disease


Description of Disease

Symptoms of Annosus root disease include fading of crowns to light green, thinning crowns, chlorotic foliage, reduced height growth, and ultimately death. Trees affected often occur as small groups. As the disease advances fruiting bodies are formed on the lower section of trunk, roots and or root collars. Fruiting bodies of this pathogen are called conks. They have a buff to dark upper surface with a cream colored under surface. The conks are perennial and will remain in place producing spores for several years. Early stages of conk formation appear as small buff-colored pustules coming through the bark of the trunk or roots.

Information on this Disease

pdf Annosus Root Disease of Western Conifers, FIDL 172

pdf Armillaria Root Rot

pdf Heart Rots of Red and White Firs

pdfCalifornia Forest Insect and Disease Training Manual

General Information and Contacts

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 yellow arrow CA Cooperative Extensions

 yellow arrow Cal Fire - California Forest Improvement Program (CFIP)

 yellow arrow Cal Fire - Contact an Urban Forestry Advisor

 yellow arrow Cal Fire - Forestry Assistance

 yellow arrow Cal Fire - Pest Management

 yellow arrow Cal Fire - Vegetation Management

 yellow arrow California Department of Food and Agriculture

 yellow arrow California National Forests - Offices

 yellow arrow California ReLEAF

 yellow arrow California Urban Forests Council - Regional Councils

 yellow arrow Fire Safe Council - Find a Local Council

 yellow arrow Forest Health and Protection

 yellow arrow Forest Pest Conditions Pacific Southwest Region

 yellow arrow Southern California Mountain Area Safety Taskforce

General Grant Resources

yellow arrow California Oak Mortality Task Force - grants

yellow arrow California ReLEAF Grants

yellow arrow Fire Safe Council Grants Clearing House

yellow arrow Fuels Reduction Program

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