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APS
Education
Resources
Common Names of Plant Diseases
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DisplayTitle
Diseases of Azalea
(
Rhododendron
spp.)
Page Content
D. M. Benson, primary collator (last update 05/29/2015)
ALGAL DISEASE
Leaf spot and stem gall
Cephaleuros virescens
Kunze ex E. M. Fries
FUNGAL DISEASES
Anthracnose
Glomerella cingulate
(Stoneman) Spauld. & Schrenk
(syn.
Colletotrichum gloeosporioides
[Penz.] Penz. & Sacc.)
Armillaria root rot (Shoestring root rot)
Armillaria mellea
(Vahl:Fr.) P. Kumm.
(syn.
Rhizomorpha subcorticalis
Pers. ex Gray)
Botrytis petal blight
B
otrytis cinerea
Pers.:Fr.
(syn.
Botryotinia fuckeliana
[de Bary] Whetzel)
Bud and twig blight
Pycnostysanus azalea
(Peck) E. W. Mason
(syn.
Briosia azaleae
Peck)
Cercospora leaf spot
Cercospora handelii
Hemmi & Kurata
(syn.
Pseudocercospora handelii
[Bubák] Deighton)
Clitocybe root rot (Mushroom root rot)
Armillaria tabescens
(Scop.) Emel.
(syn.
Clitocybe tabescens
[Scop.] Bres.)
Cylindrocladium blight and root rot
Cylindrocladium floridanum
Sobers & C. P. Seym.
(syn.
Calonectria kyotensis
Terash.)
Cylindrocladium parasiticum
Crous, M. J. Wingf., & Alfenas.
Cylindrocladium scoparium
Morgan
(syn.
Calonectria morganii
Crous, Alfenas, & M. J. Wingf.)
Cylindrocladium theae
(Petch) Subram.
(syn.
Calonectria indusiata
[Seaver] Crous)
Damping-off, Pythium
Pythium
spp.
P. irregular
Buisman
Damping-off, Rhizoctonia
Rhizoctonia solani
J. G. Kühn
(syn.
Thanatephorus cucumeris
[A. B. Frank] Donk)
Exobasidium yellow leaf spot
Exobasidium burtii
Zeller
Leaf and flower gall
Exobasidium vaccinii
(Fuckel) Woronin
(syn.
E. azalea
Peck)
Leaf rust
Chrysomyxa reticulate
P. E. Crane
Thekopsora minima
Syd. & P. Syd.
(syn.
Pucciniastrum minimum
Arthur)
Leaf scorch
Phloeospora azaleae
(Voglino) Priest
(syn.
Septoria azalea
Voglino)
Ovulinia petal blight
Ovulinia azaleae
Weiss
(syn.
Ovulitis azaleae
N. F. Buchw.)
Pestalotiopsis leaf spot and twig blight
Pestalotiopsis sydowiana
(Bres.) B. Sutton
(syns.
Pestalotia sydowiana
Bres.;
Pestalotiopsis rhododendri
Y. M. Zhang, Maharachch., & K. D. Hyde)
Phomopsis dieback
Phomopsis
spp.
Phyllosticta leaf spot
Phyllosticta rhododendri
West.
Phytophthora blight and dieback
Phytophthora citricola
Sawada
P. citrophthora
(R. E. Sm. & E. H. Sm.) Leonian
P. foliorum
Donahoo & Lamour
P. hibernalis
Carne
P. nicotianae
Breda de Haan
(syn.
P. parasitica
Dastur)
P. pseudosyringae
Jung & Delatour
P. syringae
(Berk.) Kleb.
Phytophthora root rot
Phytophthora cinnamomi
Rands
(P. cinnamomi var. cinnamomi)
P. nicotianae
Breda de Haan
(syn.
P. parasitica
Dastur)
Powdery mildew
Erysiphe azaleae
(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.
Shoot or twig blight
Monilinia azaleae
Honey
Web blight
Ceratobasidium ramicola
Tu, D. A. Roberts, & Kimbr.
(syns.
Ceratorhiza ramicola
[W. A. Weber & D. A. Roberts]
R. T. Moore;
Rhizoctonia ramicola
G. F. Weber & D. A. Roberts)
Rhizoctonia
spp. (binucleate)
(syn.
Ceratobasidium
D. P. Rogers)
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.
UNDETERMINED ETIOLOGY
Witches’-broom
Undetermined
Healthy Plants • Healthy World
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