Russian Hawthorn
Crataegus ambigua
Rosaceae · broadleaf deciduous tree · introduced
Last updated
Quick Facts
Height
15–40 ft
Light
Full Sun
Hardiness
Zone Zones 5a–8b
Origin
southern Russia ambigua: uncertain, doubtful (an apparent
Watch for this season
Fire BlightHigh
Bloom Infection Window
RustHigh
Aecial Stage (Alternate Host)
Scale insectHigh
Crawler Emergence
Tent caterpillarHigh
Larval Feeding
+ 3 more — see full disease and pest lists below
Diseases: Regionally Documented (6)
Venturia spp. — multiple host-specific species: V Scab Multiple genera (Melampsoridium, Thekopsora, Naohidemyces... Rust Symptom category — not a single disease Leaf Spot Erwinia amylovora Fire Blight Symptom category — not a single disease Canker Multiple obligate biotrophic fungi (Erysiphales: Erysipha... Powdery Mildew
Pests: Regionally Documented (10)
Tetranychidae Spider mite Coccoidea Scale insect Caliroa cerasi Pear slug Dysaphis crataegi Hawthorn aphid Choreutis pariana Apple-and-thorn skeletonizer Acanthococcus azaleae Azalea bark scale Enarmonia formosana Cherry bark tortrix Hyphantria cunea Fall webworm Tortricidae Leafroller Malacosoma spp. Tent caterpillar
Data Maturity Structured Multiple sources. Expert review underway.