unknown

Ulmus davidiana var. davidiana

Ulmaceae · broadleaf deciduous shrub · introduced

Last updated May 11, 2026

Quick Facts

Origin

restricted to China, found in the provinces of Hebei

Dutch Elm DiseaseHigh

Spring Beetle Emergence and Feeding

Nectria CankerHigh

Spore Release (Fall & Spring Rains)

Oystershell scaleHigh

Crawler Emergence

AphidModerate

Spring Colonization

+ 2 more — see full disease and pest lists below

Diseases: Regionally Documented (4)

Neonectria ditissima Nectria Canker Ophiostoma novo-ulmi Dutch Elm Disease Multiple bacterial species, including Enterobacter cloaca... Bacterial Wetwood Slime Flux Enterobacter cloacae and Klebsiella pneumoniae Bacterial Wetwood

Pests: Regionally Documented (9)

Aphidoidea Aphid Scolytinae Bark beetle Nymphalis antiopa Spiny elm caterpillar Gossyparia spuria European elm scale Fenusa ulmi Elm leafminer Xanthogaleruca luteola Elm leaf beetle Prionoxystus robiniae Carpenterworm Hyphantria cunea Fall webworm Lepidosaphes ulmi Oystershell scale

Data Maturity

Baseline Extension data. Expert review underway.