Damage Agents and Defects
Prolific branch formation below where stem was girdled by a "ziptie"
Stem forking
Alder bark beetle (Alniphagus aspericollis)
Alder recovering from a broken top suffered after thinning. Near Coombs, BC
Epicormic branches following broken tops from an ice storm. Near Sandy, OR
Unknown stem canker
Unknown stem canker
Elk rub
Poor form probaby the result of antler rub
Alder flea beetle (Altica ambiens)
Frost damage on young planted seedling
Severe lean and forking
Forking due to top beakage. Near Mt. Vernon, WA
Maple Decay
Clipped top from mountain beaver
Nectria spp. stem cankers
Nectria spp.
Nectria spp. stem cankers
Red heart in alder
Red heart in alder
Rough bark of alder (Didymosphaeria oregonensis)
Septoria- severe case on young stem
Septoria- note red color on undersides of infected leaves
"Spiraling"
10 year old pruned alder. Edge tree showing basal sprouts. Near Vernonia, OR
10 year old pruned alder. Edge tree showing sunscald. Near Vernonia, OR
10 year old pruned alder. Edge tree showing sunscald. Near Vernonia, OR
Sunscald on planted seedling
Severe sunscald on 6 year old alder. Near Vernonia, OR
Sprouting caused from dieback due to sunscald. Near Vernonia, OR