Island Manzanita

Arctostaphylos insularis

Ericaceae · broadleaf evergreen shrub · native

Last updated March 8, 2026

Quick Facts

Hardiness

Zone Zones 8a–8b

Origin

Santa Cruz Island, one of the five Channel Islands which

RustHigh

Aecial Stage (Alternate Host)

AphidModerate

Spring Colonization

Root weevilModerate

Adult Emergence & Foliar Feeding

Diseases: Regionally Documented (5)

Thielaviopsis basicola Black Root Rot Abiotic or fungal Leaf Gall Symptom category — not a single disease Leaf Spot Phytophthora Dieback Multiple genera (Melampsoridium, Thekopsora, Naohidemyces... Rust

Pests: Regionally Documented (3)

Aphidoidea Aphid Otiorhynchus spp. Root weevil Tamalia coweni Aphid (Manzanita leafgall aphid)

Data Maturity

Structured Multiple sources. Expert review underway.