Chinese Mountain Ash

Sorbus koehneana

Rosaceae · broadleaf deciduous shrub · introduced

Last updated May 11, 2026

Plant Profile

Size & Form

Height

6–10 ft

Site Requirements

Light

Part Shade

Hardiness

Zones 5a–8b

Ornamental Interest

Origin

central China

Cytospora CankerHigh

Peak Spore Production and Dispersal

Fire BlightHigh

Bloom Infection Window

RustHigh

Uredinial Stage (Summer)

Peak Population & Dispersal

+ 2 more — see full disease and pest lists below

Diseases: Regionally Documented (5)

Cytospora spp. (Valsa spp., Leucostoma spp.) Cytospora Canker Erwinia amylovora Fire Blight Symptom category — not a single disease Leaf Spot Neonectria ditissima Nectria Canker Multiple genera (Melampsoridium, Thekopsora, Naohidemyces... Rust

Pests: Regionally Documented (9)

Aphidoidea Aphid Choreutis pariana Apple-and-thorn skeletonizer Enarmonia formosana Cherry bark tortrix Pristiphora geniculata Mountain ash sawfly Pear sawfly (pear slug) Leaf blister mite Otiorhynchus spp. Root weevil Malacosoma spp. Tent caterpillar Ash borer

Data Maturity

Structured Multiple sources. Expert review underway.