American Green Alder
Alnus alnobetula subsp. crispa
Betulaceae · broadleaf deciduous shrub · introduced
Last updated
Quick Facts
Height
3–13 ft
Light
Full Sun to Shade
Hardiness
Zone Zones 1a–8b
Watch for this season
Nectria CankerHigh
Spore Release (Fall & Spring Rains)
RustHigh
Aecial Stage (Alternate Host)
Tent caterpillarHigh
Larval Feeding
Armillaria Root RotModerate
Active Below-ground Growth
+ 4 more — see full disease and pest lists below
Diseases: Regionally Documented (11)
Armillaria spp. — primarily A Armillaria Root Rot Brown Leaf Blotch [VERIFY] Canker and Stem Diseases Viral agents Catkin Hypertrophy and Leaf Curl Collar Rot Lonsdalea quercina subsp Drippy Dieback Symptom category — not a single disease Leaf Spot Neonectria ditissima Nectria Canker Phytophthora spp. (P Phytophthora Root Rot Multiple obligate biotrophic fungi (Erysiphales: Erysipha... Powdery Mildew Multiple genera (Melampsoridium, Thekopsora, Naohidemyces... Rust
Pests: Regionally Documented (7)
Data Maturity Structured Multiple sources. Expert review underway.