Forest Pest ID
Animal: Bark Beetle Larva
Fungal: Western Gall Rust—usually not lethal, but will stress the host. Pruning usually eliminates the pest.
Environmental: Sunscald
Parasitic Plant: Dwarf Mistletoe (note the “witches broom effect)
Fungal: canker
Animal: Bear damage
Animal: Spruce Budworm— defoliator
Environmental: lightning scar
Animal: Douglas-fir Tussock Moth--defoliator
Fungal: Brown Cubical Butt Rot
Beetle Lifecycle
Fungal: Western White Pine Blister Rust
Animal: Tent Caterpillar— defoliates broadleaf deciduous trees
Fungal: Pouch Fungus—does not kill a tree rather it decomposes trees that are already dead
Fungal: Swiss Needle Cast—usually not lethal but causes stress in younger conifers
Fungal: Western White Pine Blister Rust has an alternating host Ribes species (currants)
Environmental: Freeze Check (frost crack)
Animal: Emerald Ash Borer— host specific Ash only
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.
Parasitic Plant: Dwarf Mistle toe. Robs host tree of nutrients.