1. Forest Pest ID

2. Animal: Bark Beetle Larva

3. Fungal: Western Gall Rust—usually not lethal, but will stress
the host. Pruning usually eliminates the pest.

4. Environmental: Sunscald

5. Parasitic Plant: Dwarf Mistletoe
(note the “witches broom effect)

6. Fungal: canker

7. Animal: Bear damage

8. Animal: Spruce Budworm—
defoliator

9. Environmental: lightning scar

10. Animal: Douglas-fir
Tussock Moth--defoliator

11. Fungal: Brown Cubical Butt Rot

12. Beetle Lifecycle

13. Fungal: Western White Pine Blister Rust

14. Animal: Tent Caterpillar—
defoliates broadleaf deciduous
trees

15. Fungal: Pouch Fungus—does not kill a tree
rather it decomposes trees that are
already dead

16. Fungal: Swiss Needle Cast—usually not lethal but
causes stress in younger conifers

17. Fungal: Western White Pine Blister Rust has an
alternating host Ribes species (currants)

18. Environmental: Freeze Check (frost crack)

19. Animal: Emerald Ash Borer—
host specific Ash only

20. Animal: Fir Engraver Beetle—adult female lays her eggs and the hatched
larva eat the cambium (active growing
region) of the host tree. The patterns
created are referred to as “galleries.”
Each species of bark beetles create
their own unique galleries.

21. Parasitic Plant: Dwarf Mistle toe.
Robs host tree of nutrients.