Forest & Grassland Health

Spruce beetle.Spruce bud blight (<em>Gemmamyces piceae. Aspen running canker. Dead yellow-cedar crop trees in a 34-year-old young-growth stand on Kupreanof Island. Hemlock sawfly defoliation in Southeast Alaska in 2018. 2017 damage mapped by aerial survey. Bird vetch. Spotted knapweed removal.

Common Damage Agents in Alaska-
click on the menu below to learn about forest diseases & insects of Alaska!

Select forest diseases, insects and noninfectious disorders from the menu below for their current status, distribution, historic activity, symptoms, biology, and impacts to host trees and forest management. Click this link to see our annual report, Forest Health Conditions in Alaska 2017!


Foliage Diseases

Shoot & Bud Blights

Stem Diseases

Root Diseases

  • Annosus/Heterobasidion Root & Butt Rot
  • Armillaria Root Disease

Invasive Pathogens


Forest Decline

Abiotic & Animal Damage


Bark Beetles and Woodborers

  • Ambrosia Beetle
  • Northern Spruce Engraver
  • Spruce Beetle
  • Western Balsam Bark Beetle

Defoliating Insects

Conifer Defoliators
Hardwood Defoliators – External Leaf Feeding
Hardwood Defoliators –
Internal Leaf Feeding


Return to top of page