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APS
Education
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Common Names of Plant Diseases
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DisplayTitle
Diseases of Rhododendron
(
Rhododendron
spp.)
Page Content
D. M. Benson, primary collator (last update 5/29/2015)
ALGAL DISEASE
Leaf spot and stem gall
Cephaleuros virescens
Kunze ex E. M. Fries
BACTERIAL DISEASE
Crown gall
Agrobacterium tumefaciens
(Smith & Townsend) Conn
FUNGAL DISEASES
Armillaria root rot (Shoestring root rot)
Armillaria mellea
(Vahl:Fr.) P. Kumm.
(syn.
Rhizomorpha subcorticalis
Pers. ex Gray)
Botryosphaeria dieback
Botryosphaeria dothidea
(Moug.:Fr.) Ces. & de Not.
(syn.
Fusicoccum aesculi
Corda)
Botrytis leaf and petal blight
Botrytis cinerea
Pers.:Fr.
(syn.
Botryotinia fuckeliana
[de Bary] Whetzel)
Bud and twig blight
Pycnostysanus azalea
(Peck) W. E. Mason
(syn.
Briosia azalea
[Peck] Dearn.)
Cercospora leaf spot
Cercospora handelii
Hemmi & Kurata
(syn.
Pseudocercospora handelii
[Bubák] Deighton)
Chrysomyxa leaf rust
Chrysomyxa nagodhii
P. E. Crane
C. reticulata
P. E. Crane
C. roanensis
(Arthur) Arthur
Peridermium parksianum
Faull
(syn.
C. piperiana
Sacc. & Trott. ex Cummins)
Clitocybe root rot (Mushroom root rot)
Armillaria tabescens
(Scop.) Emel
(syn.
Clitocybe tabescens
[Scop.] Bres.)
Colletotrichum leaf spot
Glomerella cingulata
(Stoneman) Spauld. & Schrenk
(syn.
Colletotrichum gloeosporioides
[Penz.] Penz. & Sacc.)
Coryneum leaf spot
Seimatosporium rhododendri
(Schwein.) Piroz. & Shoemaker
(syn.
Coryneum rhododendri
Schwein.)
Cryptostictis leaf spot
Seimatosporium mariae
(Clinton) Shoemaker
(syns.
Cryptostistis mariae
[Clinton] Sacc.;
Sarcostroma mariae
[Clinton] Nag Raj)
Cylindrocarpon canker and wilt
Cylindrocarpon destructans
var.
destructans
(Zinssm.) Scholten
(syn.
C. radicicola
Wollenw.)
Cylindrocladium stem canker
Cylindrocladium theae
(Petch) Subram.
(syn.
Calonectria indusiata
[Seaver] Crous)
Damping-off, Pythium
Pythium
spp.
Damping-off, Rhizoctonia
Rhizoctonia solani
J. G. Kühn
(syn.
Thanatephorus cucumeris
[A. B. Frank] Donk)
Exobasidium yellow leaf spot
Exobasidium burtii
Zeller
Glomerella canker and dieback
Glomerella cingulata
(Stoneman) Spauld. & Schrenk
(syn.
Colletotrichum gloeosporioides
[Penz.] Penz. & Sacc.)
Gray blight
Pestalotiopsis sydowiana
(Bres.) B. Sutton
(syns.
Pestalotia sydowiana
Bres.;
Pestalotiopsis rhododendri
Y. M. Zhang, Maharachch., & K. D. Hyde)
Leaf and flower gall
Exobasidium vaccinii
(Fuckel) Woronin
(syn.
E. azalea
Peck)
Lophodermium leaf spot
Lophodermium schweinitzii
M. Wilson & N. F. Robertson
Ovulinia petal blight
Ovulinia azalea
Weiss
(syn.
Ovulitis azaleae
N. F. Buchw.)
Pestalosphaeria leaf spot
Pestalosphaeria concentrica
M. E. Barr
(syn.
Pestalotiopsis guepini
var.
macrotricha
[Kleb.] B. Sutton)
Pestalotiopsis leaf spot and twig blight
Pestalotiopsis sydowiana
(Bres.) B. Sutton
(syns.
Pestalotia sydowiana
Bres.;
Pestalotiopsis rhododendri
Y. M. Zhang, Maharachch., & K. D. Hyde)
Pestalotiopsis guepinii
var.
macrotricha
(Kleb.) B. Sutton
(syn.
Pestalotia macrotricha
Kleb.)
Phyllosticta leaf spot
Phyllosticta cunninghamiae
Allesch.
Phymatotrichopsis root rot (Cotton root rot)
Phymatotrichopsis omnivora
(Shear) Hennebert
(syn.
Phymatotrichum omnivorum
[Shear] Duggar)
Phytophthora blight and dieback
Phytophthora cactorum
(Lebert & Cohn) Schröt.
P. cambivora
(Petri) Buisman
P. cinnamomi
Rands (
P. cinnamomi
var.
cinnamomi
)
P. citricola
Sawada
P. citrophthora
(R. E. Sm. & E. H. Sm.) Leonian
P. gonapodyides
(H. E. Petersen) Buisman
P. hedraiandra
De Cock & Man in 't Veld
P. heveae
A. Thomps.
P. hibernalis
Carne
P. hydropathica
Hong & Gallegly
P. inflata
Caroselli & Tucker
P. insolita
Ann & W. H. Ko
P. kernoviae
Brasier, Beales, & S. A. Kirk
P. nicotianae
Breda de Haan
(syn.
P. parasitica
Dastur)
P. pini
(Leonian) Gallegly, Hong, Richardson, & Kong
P. plurivora
T. Jung & T. I. Burgess
P. ramorum
Werres, De Cock, & Man in 't Veld
P. syringae
(Berk.) Kleb.
P. tropicalis
Aragaki & J. Y. Uchida
Phytophthora root rot
Phytophthora cactorum
(Lebert & Cohn) Schröt.
P. cambivora
(Petri) Buisman
P. cinnamomi
var.
cinnamomi
Rands
P. citricola
Sawada
P. cryptogea
Pethybr. & Laff.
P. nicotianae
Breda de Haan
(syn.
P. parasitica
Dastur)
Powdery mildew
Erysiphe azalea
(U. Braun) U. Braun & S. Takam.
E. digitata
(A. J. Inman & U. Braun) A. J. Inman & U. Braun
E. izuensis
(Y. Nomura) U. Braun & S. Takam.
E. rhododendri
J. N. Kapoor
E. vaccinii
Schwein.
Oidium ericinum
Erikss.
Phyllactinia guttata
(Wallr.:Fr.) Lév.
P. rhododendri
H. D. Shin & Y. J. La.
Septoria leaf spot
Septoria rhododendri
Cooke
Spot anthracnose
Sphaceloma
spp.
Thekopsora leaf rust
Thekopsora minima
Syd. & P. Syd.
(syn.
Pucciniastrum minimum
Arthur)
Witches’-broom
Exobasidium vaccinii-uliginosi
Boud.
NEMATODES (PARASITIC)
Foliar nematode:
Aphelenchoides fragariae
(Ritzema Bos) Christie
Root-knot nematode:
Meloidogyne
spp.
Stunt nematode:
Tylenchorhynchus claytoni
Steiner
PARASITIC HIGHER PLANT
Dodder (Scaldweed)
Cuscuta gronovii
Willd. ex Schult.
VIRUS DISEASES
Necrotic ringspot
Genus
Potexvirus
(Potato virus X group), Rhododendron necrotic ringspot virus (RoNRSV)
Other Viruses Causing Asymptomatic Infections
Petuvirus:
Rhododendron virus N (RhVN)
Unknown:
Rhododendron virus A (RhVA)
Healthy Plants • Healthy World
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