Rhododendron
Rhododendron ponticum
Ericaceae · broadleaf · introduced
Quick Facts
Light
Part Shade
Soil
Moist
Water
Moderate
Hardiness
Zone Zones 6a–9b
Diseases (30)
Armillaria ostoyae Armillaria Root Rot
Botryosphaeria dothidea Botryosphaeria Dieback
Botrytis cinerea Botrytis Petal Blight
Botrytis cinerea Botrytis Shoot Blight
Seifertia azaleae Bud Blight
Rhododendron and Cutting Rots
Cylindrocladium scoparium Cylindrocladium Blight and Root Rot
Pestalotiopsis sydowiana Gray Blight
Non-pathogenic (abiotic stress) Leaf Burn
abiotic (drought, heat stress) or bacterial (Xylella fast... Leaf Scorch
Various fungi (Phyllosticta spp., Septoria spp., Cercospo... Leaf Spot
Exobasidium vaccinii Leaf and Flower Gall
Non-pathogenic (iron deficiency) Lime-induced Chlorosis
Marginal leaf necrosis
A potexvirus, rhododendron necrotic ringspot virus, has b... Necrotic Ringspot
Ovulinia azaleae Ovulinia Petal Blight
Non-pathogenic (physiological disorder) Physiological leaf spot
Many different Phytophthora Blight and Dieback
Phytophthora Root Rot and Wilt
Phytophthora spp. Phytophthora Blight
Phytophthora spp. (P Phytophthora Root Rot
Podosphaera aphanis var. aphanis Powdery Mildew
Ramorum Leaf Blight
Phytophthora ramorum"filthy five\" genera are inc Ramorum Leaf Blight and Shoot Dieback
Phytophthora ramorum Ramorum leaf and shoot blight (Sudden oak death)
Thekopsora minima and Naohidemyces vaccinii Rust
Salt injury
Non-pathogenic (abiotic — solar radiation damage) Sunburn
Non-pathogenic; genetic/physiological abnormality from ti... Tissue Proliferation
Taphrina wiesneri Witches' Broom
Pests (19)
Cinara occidentalis, Cinara abietis Aphid
Azalea and rhododendron lace bug
Acanthococcus azaleae Azalea bark scale
Azalea leafminer
Azalea sawfly
Carnation tortrix
Caterpillars
Cottony cushion scale
Lace bug
Nuculaspis californica Lecanium scale
Choristoneura rosaceana Obliquebanded Leafroller
Stephanitis rhododendri Rhododendron lace bug
Dialeurodes chittendeni Rhododendron whitefly
Cylindrocopturus furnissi Root weevil
Tetranychidae Spider mite
Nematode, Stunt
Root Rot (Phytophthora spp.)
Stephanitis pyrioides Azalea Lace Bug
Rhododendron bud moth
Cultivars (1)
Variegatum
Common name: Variegated Pontic Rhododendron; Mature height: 4–5 ft