Formosan Juniper
Juniperus formosana
Cupressaceae · coniferous tree · introduced
Last updated
Plant Profile
Size & Form
Height
50 ft
Site Requirements
Light
Full Sun
Hardiness
Zones 8a–8b
Ornamental Interest
Origin
China and Taiwan, widely distributed in mountains
Watch for this season
RustHigh
Uredinial Stage (Summer)
AphidHigh
Peak Population & Dispersal
Spring Population Buildup
Armillaria Root RotModerate
Active Below-ground Growth
+ 3 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.