Rose rosette rust
Phragmidium mucronatum
Insect
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Fungal rust disease causing bright orange pustules on rose leaves. Bay Area rose pathogen; overwinters on wild roses; reduces ornamental rose vigor.
Plants that support Rose rosette rust
4 plants
Bald-hip Rose
Rosa gymnocarpa
shrub
Larval Host
Bay Area native
Keystone species
California Wild Rose
Rosa californica
shrub
Larval Host
Bay Area native
Keystone species
Groundcover Rose*
Rosa spithamea
shrub
Larval Host
Bay Area native
Keystone species
Nootka Rose
Rosa nutkana
perennial herb
Larval Host
Bay Area native
Keystone species