Tomentosus Root Rot - Spruce Tree Tomentosus Root Rot Disease

Tomentosus root rot is an important disease of spruce throughout south-central and interior Alaska. Although widespread across the boreal and sub-boreal forests, the disease is absent from southeast Alaska. Infected trees exhibit growth reduction, decay of the root system and lower bole, premature uprooting, or mortality. All native spruce species (Picea spp.) in Alaska are highly susceptible to infection and lodgepole pine (Pinus contorta) is considered moderately susceptible. Hardwood species, including paper birch (Betula papyrifera) and trembling aspen (Populus tremuloides), are immune to infection. This leaflet will familiarize you with the tree disease, briefly explain the biology of the causal fungus, and provide options for disease management.

Tomentosus Root Disease by Lori Trummer
Forest Pathologist, USDA Forest Service Alaska Region, State and Private Forestry

May 1999

Additional information on this disease can be obtained from:

Forest Health Protection
State and Private Forestry
USDA Forest Service
3301 C Street, Suite 202
Anchorage, AK 99503
Phone: (907) 743-9455
FAX: (907) 743-9479

The Alaska Region of the USDA Forest Service is an equal opportunity provider and employer. To file a complaint of discrimination, call (202) 720-5964.