List of rhododendron diseases

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This article is a list of diseases of rhododendron (Rhododendron spp.).

Bacterial diseases[edit]

Bacterial diseases
Crown gall Agrobacterium tumefaciens

Fungal diseases[edit]

Fungal diseases
Armillaria root rot

Shoestring root rot

Armillaria mellea
Rhizomorpha subcorticalis [anamorph]

Botryosphaeria dieback

Botryosphaeria dothidea
Fusicoccum aesculi [anamorph]

Botrytis leaf and petal blight

Botrytis cinerea
Botryotinia fuckeliana [teleomorph]

Bud and twig blight Pycnostysanus azaleae

= Briosia azaleae

Cercospora leaf spot

Pseudocercospora handelii
= Cercospora handelii

Chrysomyxa leaf rust

Chrysomyxa ledi var. rhododendri
Chrysomyxa piperiana
Chrysomyxa roanensis

Clitocybe root rot (mushroom root rot)

Armillaria tabescens
= Clitocybe tabescens

Coryneum leaf spot

Seimatosporium rhododendri
= Coryneum rhododendri

Cryptostictis leaf spot

Seimatosporium mariae
= Cryptostictis mariae

Cylindrocarpon canker and wilt

Cylindrocarpon destructans
= Cylindrocarpon radicicola

Damping-off, Pythium

Pythium spp.

Damping-off, Rhizoctonia

Rhizoctonia solani
Thanatephorus cucumeris [teleomorph]

Exobasidium leaf spot

Exobasidium burtii

Glomerella canker and dieback

Glomerella cingulata
Colletotrichum gloeosporioides [anamorph]

Gray blight

Pestalotia sydowiana

Leaf and flower gall

Exobasidium vaccinii
= Exobasidium azaleae

Lophodermium leaf spot

Lophodermium schweinitzii

Ovulinia petal blight

Ovulinia azaleae
Ovulitis azaleae [anamorph]

Pestalosphaeria leaf spot

Pestalosphaeria concentrica
Pestalotiopsis guepini [anamorph]

Pestalotia leaf spot

Pestalotiopsis sydowiana
= Pestalotia rhododendri

Phymatotrichum root rot (cotton root rot)

Phymatotrichopsis omnivora
= Phymatotrichum omnivorum

Phytophthora dieback

Phytophthora nicotianae var. parasitica
= Phytophthora parasitica
Phytophthora cactorum
Phytophthora cinnamomi
Phytophthora citricola
Phytophthora citrophthora
Phytophthora heveae
Phytophthora lateralis

Phytophthora root rot

Phytophthora cactorum
Phytophthora cinnamomi
Phytophthora citricola

Powdery mildew

Microsphaera vaccinii
= Microsphaera penicillata var. vaccinii

Pucciniastrum leaf rust

Pucciniastrum vaccinii

Septoria leaf spot

Septoria rhododendri

Spot anthracnose

Sphaceloma sp.

Stem canker

Cylindrocladium theae
Calonectria theae [teleomorph]

Witches' broom

Exobasidium vaccinii-uliginosi

Nematodes, parasitic[edit]

Nematodes, parasitic
Dagger, American Xiphinema americanum
Lance Hoplalaimus galeatus
Sheath Hemicycliophora spp.
Spiral Helicotylenchus erythinae
Stubby-root Paratrichodorus spp.
Stunt Tylenchorhynchus claytoni

Viral diseases[edit]

Viral diseases
Necrotic ringspot Potato virus X group

References[edit]