Formosan Juniper
Juniperus formosana
Cupressaceae · coniferous tree · introduced
Last updated
Quick Facts
Height
50 ft
Light
Full Sun
Hardiness
Zone Zones 8a–8b
Origin
China and Taiwan, widely distributed in mountains
Watch for this season
RustHigh
Aecial Stage (Alternate Host)
Armillaria Root RotModerate
Active Below-ground Growth
Phytophthora Root RotModerate
Growing Season Stress Expression
AphidModerate
Spring Colonization
+ 2 more — see full disease and pest lists below
Diseases: Regionally Documented (11)
Multiple genera (Melampsoridium, Thekopsora, Naohidemyces... Rust Phytophthora spp. (P Phytophthora Root Rot Phomopsis Twig Blight Magnesium Deficiency Canker and Dieback Pear Trellis Rust Armillaria spp. — primarily A Armillaria Root Rot Symptom category — not a single disease Leaf Blight Phoradendron villosum Mistletoe (a True Mistletoe) Seiridium cardinale Seiridium Canker Taphrina wiesneri Witches' Broom
Pests: Regionally Documented (10)
Carulaspis juniperi Juniper scale Oligonychus ununguis Spruce spider mite Various (Agromyzidae, Gracillariidae, Tenthredinidae) Leafminer Juniper fall-webworm Oligotrophus betheli Juniper tip midge Argyresthia cupressella Cypress tip moth Aphidoidea Aphid Otiorhynchus spp. Root weevil Tetranychidae Spider mite Argyresthia spp. Cypress tip moth and allies
Data Maturity Structured Multiple sources. Expert review underway.