List of rhododendron diseases

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]

* Common Names of Diseases, The American Phytopathological Society
* Diseases and pests of rhododendrons
* Images of diseases and pests of rhododendrons