BioInfo (UK)

Rhododendron L. (rhododendrons and azaleas)

BioImages BioImages (www.bioimages.org.uk) has 13 images of Rhododendron (rhododendrons and azaleas)

NBN NBN (data.nbn.org.uk) has the UK distribution map of Rhododendron (rhododendrons and azaleas)

Subtaxa (ie subgroups of this Genus)

Taxon Rank #refs #webs
Azaleodendron 'Dr Masters' (a rhododendron) Cultivar   2
Rhododendron arboreum W.W. Sm. (Tree Rhododendron) Species   2
Rhododendron armitti (a house plant) Species   1
Rhododendron aurigeranum (a house plant) Species   1
Rhododendron brachyanthum (a cultivated rhododendron) Species   1
Rhododendron brookeanum (a house plant) Species   1
Rhododendron burtii (a house plant) Species   1
Rhododendron campanulatum (a rhododendron) Species   2
Rhododendron campylocarpum (a cultivated rhododendron) Species   3
Rhododendron catawbiense (a cultivated rhododendron) Species 1 2
Rhododendron caucasicum (a cultivated rhododendron) Species   2
Rhododendron championae (a house plant) Species   1
Rhododendron christi (a house plant) Species   1
Rhododendron christianae (a house plant) Species   1
Rhododendron cinnabarinum (a cultivated rhododendron) Species   5
Rhododendron crutwellii (a house plant) Species   1
Rhododendron dichroanthum (a cultivated rhododendron) Species   1
Rhododendron dielsianum (a house plant) Species   1
Rhododendron falconeri (a cultivated rhododendron) Species   2
Rhododendron ferrugineum L. (Alpenrose) Species   2
Rhododendron forrestii (a cultivated rhododendron) Species   1
Rhododendron fortunei (a cultivated rhododendron) Species   1
Rhododendron griffithianum (a cultivated rhododendron) Species   1
Rhododendron hippophaëoides x racemosum (a cultivated rhododendron) Species hybrid   2
Rhododendron hirsutum (a cultivated rhododendron) Species   3
Rhododendron inconspicuum (a house plant) Species   1
Rhododendron indicum (Pot Azalea) Species   3
Rhododendron intranervatum (a house plant) Species   1
Rhododendron japonicum (a cultivated rhododendron) Species   1
Rhododendron javanicum (a house plant) Species   1
Rhododendron keleticum (a rhododendron) Species   2
Rhododendron laetum (a house plant) Species   1
Rhododendron lanceolatum (a house plant) Species   1
Rhododendron leptanthum (a house plant) Species   1
Rhododendron lochae (a house plant) Species   1
Rhododendron luteosquamatum (a house plant) Species   1
Rhododendron luteum Sweet (Yellow Azalea) Species   4
Rhododendron macgregoriae (a house plant) Species   1
Rhododendron macrophyllum D. Don ex G. Don (Californian Rosebay) Species 1  
Rhododendron maxwellii (a house plant) Species   1
Rhododendron mucronatum (an evergreen azalea) Species   1
Rhododendron nervulosum (a house plant) Species   1
Rhododendron occidentale (a cultivated rhododendron) Species   1
Rhododendron orbiculatum (a house plant) Species   1
Rhododendron pneumonanthum (a house plant) Species   1
Rhododendron ponticum L. (Rhododendron) Species 2 38
Rhododendron retivenium (a house plant) Species   1
Rhododendron rhodoleucum (a house plant) Species   1
Rhododendron rugosum (a house plant) Species   1
Rhododendron santapauli (a house plant) Species   1
Rhododendron searlianum (a house plant) Species   1
Rhododendron sessilifolium (a house plant) Species   1
Rhododendron simsii (Glasshouse Azalea) Species   4
Rhododendron stenophyllum (a house plant) Species   1
Rhododendron thomsonii (a cultivated rhododendron) Species   3
Rhododendron veitchianum (a house plant) Species   1
Rhododendron verticillatum (a house plant) Species   1
Rhododendron x hybridum Ker Gawl., 1817 (a cultivated rhododendron) Species hybrid   1
Rhododendron x laetivirens (a group of cultivated rhododendron hybrids) Species hybrid   1
Rhododendron zoelleri (a house plant) Species   1
(Azalea cultivars) (horticultural azaleas) Informal   9

Suggested Literature

General Works

Henrici, A., 2004 (Sudden Oak Death) Notes and Records (Jan 2004)

Rhododendron may also be covered by literature listed under:

BIOTA
(living things)
Eukaryota
(eukaryotes)
PLANTAE
(plants)
TRACHEOPHYTA
(vascular plants)
MAGNOLIOPSIDA
(flowering plants)
ERICACEAE
(heaths, heathers, rhododendrons, azaleas & wintergeeens)

Feeding and other inter-species relationships

Associated with Rhododendron:

(dead) dead is decayed by colony of Acrodontium dematiaceous anamorph Acrodontium hydnicola - a dematiaceous anamorphic fungus UK/Ireland Dennis, R.W.G., 1995
(dead) dead is decayed by acervulus of Pestalotiopsis coelomycetous anamorph Pestalotiopsis funerea - a coelomycete (Xylariales: Amphisphaeriaceae) UK/Ireland Dennis, R.W.G., 1995
(dead) dead is decayed by acervulus of Pestalotiopsis coelomycetous anamorph Pestalotiopsis sydowiana - a coelomycete (Xylariales: Amphisphaeriaceae) UK/Ireland Dennis, R.W.G., 1995
(dead) dead is decayed by acervulus of Pestalotiopsis coelomycetous anamorph Pestalotiopsis versicolor - a coelomycete (Xylariales: Amphisphaeriaceae) UK/Ireland Dennis, R.W.G., 1995
(live) live is foodplant of adult Otiorhynchus (Dorymerus) singularis - Raspberry Weevil, Clay-coloured Weevil (Coleoptera: Curculionidae) Buczacki, S. & Harris, K., 1998
(live) live has sap sucked by nymph Kleidocerys resedae - Birch Catkin Bug (Hemiptera: Lygaeidae) Southwood, T.R.E. & Leston, D., 1959
(live) live has sap sucked by adult Kleidocerys resedae - Birch Catkin Bug (Hemiptera: Lygaeidae) Southwood, T.R.E. & Leston, D., 1959
is foodplant of pycnidium of Phyllosticta coelomycetous anamorph Phyllosticta cunninghami - a coelomycete (Botryosphaeriales: Botryosphaeriaceae) UK/Ireland Dennis, R.W.G., 1995
is foodplant of pycnidium of Phoma coelomycetous anamorph Phyllosticta rhodorae - a coelomycete (Botryosphaeriales: Botryosphaeriaceae) UK/Ireland Dennis, R.W.G., 1995
is foodplant of pycnidium of Phoma coelomycetous anamorph Phoma leveillei - a coelomycete (Pleosporales) UK/Ireland Dennis, R.W.G., 1995
is foodplant of pycnidium of Phoma coelomycetous anamorph Phoma pomorum - a coelomycete (Pleosporales) UK/Ireland Dennis, R.W.G., 1995
is foodplant of pycnidium of Diplodina coelomycetous anamorph Diplodina eurhododendri - a coelomycete (Diaporthales: Gnomoniaceae) UK/Ireland Dennis, R.W.G., 1995
may be infected and damaged by Armillaria mellea s.l. - honey fungi (Agaricales: Physalacriaceae) Moore, W.C., 1959
has sap sucked by adult Stephanitis rhododendri - Rhododendron Lacebug (Hemiptera: Tingidae) Southwood, T.R.E. & Leston, D., 1959
has sap sucked by nymph Stephanitis rhododendri - Rhododendron Lacebug (Hemiptera: Tingidae) Southwood, T.R.E. & Leston, D., 1959
has sap sucked by Stephanitis takeyai - Andromeda Lacebug (Hemiptera: Tingidae) MacLeod, A., 2006
is decayed by stromatic, single or in groups of 2-3 apothecium Ovulinia azaleae - Rhododendron Petal Blight - causative organism (Helotiales: Sclerotiniaceae) Foreign+?UK/Ireland Ellis, M.B. & J.P., 1997
bark (dead) dead bark is decayed by effuse colony of Acladium anamorph Botryobasidium conspersum - a resupinate fungus (Cantharellales: Botryobasidiaceae) Ellis, M.B. & J.P., 1997
bark bark is decayed by effuse colony of Mariannaea anamorph Mariannaea elegans - an anamorphic fungus (Hypocreales: Nectriaceae) Ellis, M.B. & J.P., 1997
branch (dead, decorticate) dead, decorticate branch is decayed by hysterothecium Hysterium angustatum - a coffee bean fungus (Hysteriales: Hysteriaceae) Ellis, M.B. & J.P., 1997
branch (dead, esp. buried under brushwood) dead, esp. buried under brushwood branch is decayed by gregarious, subiculate perithecium Rosellinia aquila - a pyrenomycete (Xylariales: Xylariaceae) Ellis, M.B. & J.P., 1997 [especially near the bottom of piles of brushwood]
branch (dead, esp. buried under brushwood) dead, esp. buried under brushwood branch is decayed by colony of Geniculosporium dematiaceous anamorph Rosellinia aquila - a pyrenomycete (Xylariales: Xylariaceae) Ellis, M.B. & J.P., 1997 [especially near the bottom of piles of brushwood]
branch (dead, fallen) dead, fallen branch is decayed by extensively subiculate apothecium Tapesia fusca - a discomycete (Helotiales: Dermateaceae) Ellis, M.B. & J.P., 1997
branch (dead, locally dark reddish-brown, shining) dead, locally dark reddish-brown, shining branch is decayed by scattered, immersed, plurilocular stroma of Cytospora coelomycetous anamorph Cytospora subclypeata - a stromatic coelomycete (Diaporthales: Valsaceae) UK/Ireland Grove, W.B., 1935,
Ellis, M.B. & J.P., 1997
branch (dead, often grey or purple stained) dead, often grey or purple stained branch is decayed by effuse colony of Triposporium dematiaceous anamorph Triposporium elegans - a dematiaceous anamorphic fungus (Capnodiales: Asterinaceae) Ellis, M.B. & J.P., 1997
branch (dead) dead branch is decayed by hysterothecium Gloniopsis praelonga - an ascomycete (Hysteriales: Hysteriaceae) Ellis, M.B. & J.P., 1997
branch (dead) dead branch is decayed by effuse colony of Sporidesmium dematiaceous anamorph Sporidesmium leptosporum - a dematiaceous anamorphic fungus (Pleosporales) Ellis, M.B. & J.P., 1997
branch (dead) dead branch is decayed by sessile apothecium Mollisia cinerea - Common Grey Disco (Helotiales: Dermateaceae) Ellis, M.B. & J.P., 1997
branch (dead) dead branch is decayed by apothecium Dematioscypha dematiicola - a discomycete (Helotiales: Hyaloscyphaceae) Ellis, M.B. & J.P., 1997
branch (dead) dead branch is decayed by effuse colony of Haplographium dematiaceous anamorph Dematioscypha dematiicola - a discomycete (Helotiales: Hyaloscyphaceae) Ellis, M.B. & J.P., 1997
branch (dead) dead branch is decayed by stromatic, in clusters of up to 15 perithecium Nectria cinnabarina - Coral Spot (Hypocreales: Nectriaceae) Ellis, M.B. & J.P., 1997
branch (dead) dead branch is decayed by sporodochium of Tubercularia anamorph Nectria cinnabarina - Coral Spot (Hypocreales: Nectriaceae) Ellis, M.B. & J.P., 1997
branch (dead) dead branch is decayed by Tubulicrinis regificus - a white-wash fungus (Polyporales: Tubulicrinaceae) Legon, N.W. & Henrici, A. with Roberts, P.J., Spooner, B.M. & Watling, R., 2005
branch (fallen, dead, esp. covered by leaf mould) fallen, dead, esp. covered by leaf mould branch is decayed by perithecium Chaetosphaeria inaequalis - a pyrenomycete (Chaetosphaeriales: Chaetosphaeriaceae) Ellis, M.B. & J.P., 1997 [especially when covered by leaf mould]
branch (fallen, dead, esp. covered by leaf mould) fallen, dead, esp. covered by leaf mould branch is decayed by colony of Gonytrichum dematiaceous anamorph Chaetosphaeria inaequalis - a pyrenomycete (Chaetosphaeriales: Chaetosphaeriaceae) Ellis, M.B. & J.P., 1997 [especially when covered by leaf mould]
branch (fallen, dead) fallen, dead branch is decayed by effuse colony of Helminthosporium dematiaceous anamorph Helminthosporium velutinum - a dematiaceous anamorphic fungus (Pleosporales: Massarinaceae) Ellis, M.B. & J.P., 1997
branch (fallen, dead) fallen, dead branch is decayed by colony of Phaeostalagmus dematiaceous anamorph Phaeostalagmus cyclosporus - a dematiaceous anamorphic fungus (Chaetosphaeriales: Chaetosphaeriaceae) Ellis, M.B. & J.P., 1997
branch (fallen) fallen branch is decayed by colony of Phaeostalagmus dematiaceous anamorph Phaeostalagmus tenuissimus - a dematiaceous anamorphic fungus (Chaetosphaeriales: Chaetosphaeriaceae) Ellis, M.B. & J.P., 1997
branch (large) (decayed) decayed branch (large) is decayed by fruitbody Crepidotus applanatus var. applanatus - Flat Oysterling (Agaricales: Inocybaceae) UK/Ireland Legon, N.W. & Henrici, A. with Roberts, P.J., Spooner, B.M. & Watling, R., 2005
branch wood (dry, hard, decorticate) dry, hard, decorticate branch wood is decayed by superficial pycnidium of Aposphaeria coelomycetous anamorph Melanomma pulvis-pyrius - an ascomycete (Pleosporales: Melanommataceae) Ellis, M.B. & J.P., 1997
branch wood (dry, hard, decorticate) dry, hard, decorticate branch wood is decayed by superficial, often in very large clusters pseudothecium Melanomma pulvis-pyrius - an ascomycete (Pleosporales: Melanommataceae) Ellis, M.B. & J.P., 1997
bud (live) live bud may contain caterpillar Zeuzera pyrina - Leopard Moth (Lepidoptera: Cossidae) Buczacki, S. & Harris, K., 1998
flower bud (esp terminal) (brown, then silvery) brown, then silvery flower bud (esp terminal) may be infected and damaged by coremium of Pycnostysanus dematiacous anamorph Pycnostysanus azaleae - Rhododendron Bud Blast and Twig Blight - causative organism (Chaetothyriales: Herpotrichiellaceae) UK/Ireland Restricted Buczacki, S. & Harris, K., 1998,
Dennis, R.W.G., 1995,
Ellis, M.B. & J.P., 1997 ["Rhododendron Bud Blast" and "Twig Blight"]
leaf (dead, attached) dead, attached leaf is decayed by epiphyllous, immersed, in swarm perithecium Phomatospora gelatinospora - a pyrenomycete (Xylariales) Ellis, M.B. & J.P., 1997
leaf (dead, fallen) dead, fallen leaf is decayed by immersed apothecium Lophodermium vagulum - a discomycete (Rhytismatales: Rhytismataceae) Ellis, M.B. & J.P., 1997
leaf (dead, locally dark reddish-brown, shining) dead, locally dark reddish-brown, shining leaf is decayed by scattered, immersed, plurilocular stroma of Cytospora coelomycetous anamorph Cytospora subclypeata - a stromatic coelomycete (Diaporthales: Valsaceae) UK/Ireland Grove, W.B., 1935,
Ellis, M.B. & J.P., 1997
leaf (dead) dead leaf is decayed by effuse colony of Belemnospora dematiaceous anamorph Belemnospora epiphylla - a dematiaceous anamorphic fungus UK/Ireland Dennis, R.W.G., 1995,
Ellis, M.B. & J.P., 1997
leaf (dead) dead leaf is decayed by immersed, numerous, gregarious pycnidium of Coleophoma coelomycetous anamorph Coleophoma cylindrospora - a coelomycete Grove, W.B., 1935
leaf (dead) dead leaf is decayed by hypostromatic hysterothecia Aulographum hederae - a fly speck fungus (Microthyriales: Aulographaceae) Ellis, M.B. & J.P., 1997
leaf (dead) dead leaf is decayed by effuse colony of Sporidesmium dematiaceous anamorph Sporidesmium bombacis - a dematiaceous anamorphic fungus (Pleosporales) Ellis, M.B. & J.P., 1997
leaf (dead) dead leaf is decayed by effuse colony of Henicospora dematiaceous anamorph Henicospora minor - a dematiaceous anamorphic fungus Ellis, M.B. & J.P., 1997
leaf (dead) dead leaf is decayed by superficial, subiculate pseudothecium Protoventuria arxii - an ascomycete (Pseudosphaeriales: Venturiaceae) Ellis, M.B. & J.P., 1997
leaf (dead) dead leaf is decayed by acervulus of Seimatosporium coelomycetous anamorph Seimatosporium arbuti - a coelomycete (Xylariales: Amphisphaeriaceae) Ellis, M.B. & J.P., 1997
leaf (dead) dead leaf is decayed by acervulus of Seimatosporium coelomycetous anamorph Seimatosporium mariae - a coelomycete (Xylariales: Amphisphaeriaceae) Ellis, M.B. & J.P., 1997
leaf (dead) dead leaf is spotted by amphigenous acervulus of Pestalotiopsis coelomycetous anamorph Pestalotiopsis guepinii - a camellia leaf-spot (Xylariales: Amphisphaeriaceae) UK/Ireland Buczacki, S. & Harris, K., 1998,
Dennis, R.W.G., 1995,
Ellis, M.B. & J.P., 1997 [oozes black spore mass]
leaf (esp. near midrib) (dead) dead leaf (esp. near midrib) is decayed by amphigenous, erumpent perithecium Chaetapiospora rhododendri - a pyrenomycete (Xylariales: Hyponectriaceae) Ellis, M.B. & J.P., 1997 [especially near the midrib]
leaf (fading) fading leaf is spotted by epiphyllous, scattered, immersed then erumpent pycnidium of Phyllosticta coelomycetous anamorph Phyllosticta saccardoi - a coelomycete (Botryosphaeriales: Botryosphaeriaceae) UK/Ireland Grove, W.B., 1935 [causes spots which begin at the tip and spread widely, esp. along the edges. At length becoming grey with a sharply defined boundary which is margined by a broad dark brown line.],
Dennis, R.W.G., 1995
leaf (fallen, long dead) fallen, long dead leaf is decayed by thinly scattered, mostly hypophyllous, dimorphic pycnidium of Ceuthospora coelomycetous anamorph Phacidium falconeri - a discomycete (Helotiales: Phacidiaceae) UK/Ireland Grove, W.B., 1935,
Ellis, M.B. & J.P., 1997
leaf (fallen) fallen leaf is decayed by perithecium Melanospora pegleri - a pyrenomycete (Melanosporales: Ceratostomataceae) UK/Ireland Hawksworth, D.L., Henrici, A. & Kirk, P.M., 1999
leaf (live) live leaf is galled by fruitbody Exobasidium japonicum - a redleaf fungus (Exobasidiales: Exobasidiaceae) UK/Ireland Legon, N.W. & Henrici, A. with Roberts, P.J., Spooner, B.M. & Watling, R., 2005 [causes pallid, fleshy galls],
Ellis, M.B. & J.P., 1997
leaf (live) live leaf is grazed by caterpillar Orgyia antiqua - Vapourer Moth (Lepidoptera: Erebidae) Buczacki, S. & Harris, K., 1998
leaf (live) live leaf is parasitised by mainly hypophyllous conidial anamorph Erysiphe azaleae - a powdery mildew (Erysiphales: Erysiphaceae) UK/Ireland Henrici, A., 2004,
Ing, B., 2000
leaf (live) live leaf is parasitised by cleistothecium Erysiphe azaleae - a powdery mildew (Erysiphales: Erysiphaceae) UK/Ireland Henrici, A., 2004,
Ing, B., 2000
leaf (live) live leaf is parasitised by mostly hypophyllous uredium Chrysomyxa rhododendri - Rhododendron Rust (Pucciniales: Coleosporiaceae) UK/Ireland Buczacki, S. & Harris, K., 1998,
Legon, N.W. & Henrici, A. with Roberts, P.J., Spooner, B.M. & Watling, R., 2005,
Ellis, M.B. & J.P., 1997
leaf (live) live leaf is parasitised by mostly hypophyllous telium Chrysomyxa rhododendri - Rhododendron Rust (Pucciniales: Coleosporiaceae) UK/Ireland Buczacki, S. & Harris, K., 1998,
Legon, N.W. & Henrici, A. with Roberts, P.J., Spooner, B.M. & Watling, R., 2005,
Ellis, M.B. & J.P., 1997
leaf (live) live leaf may be infected and damaged by amphigenous, immersed pycnidium of Septoria coelomycetous anamorph Septoria azaleae - a leaf-spot fungus (Capnodiales: Mycosphaerellaceae) UK/Ireland Buczacki, S. & Harris, K., 1998,
Dennis, R.W.G., 1995 [usually on imported pot plants],
Ellis, M.B. & J.P., 1997 [causes leaf scorch, the leaf turning yellow to rusty brown from the tip backwards]
leaf (live) live leaf has sap sucked by Graphocephala fennahi - Rhododendron Leafhopper (Hemiptera: Cicadellidae) UK/Ireland Buczacki, S. & Harris, K., 1998
leaf (live) live leaf has sap sucked by Dialeurodes chittendeni - Rhododendron Whitefly (Hemiptera: Aleyrodidae) Buczacki, S. & Harris, K., 1998
leaf (live) live leaf has sap sucked by hypophyllous Pulvinaria floccifera - Cushion Scale, Cottony Camellia Scale (Hemiptera: Coccidae) UK/Ireland Buczacki, S. & Harris, K., 1998
leaf (live) live leaf is spotted by immersed pseudothecium Botryosphaeria rhodorae - an ascomycete (Botryosphaeriales: Botryosphaeriaceae) Ellis, M.B. & J.P., 1997 [causes brown or greyish-brown spots]
leaf (live) live leaf is spotted by pycnidial anamorph Botryosphaeria rhodorae - an ascomycete (Botryosphaeriales: Botryosphaeriaceae) Ellis, M.B. & J.P., 1997 [causes brown or greyish-brown spots]
leaf (live) live leaf is spotted by Phyllosticta coelomycetous anamorph Phyllosticta rhododendri senu Sacc. - a coelomycete (Botryosphaeriales: Botryosphaeriaceae) Buczacki, S. & Harris, K., 1998 [causes rusty brown lesions]
leaf (live) live leaf is spotted by amphigenous colony of Pseudocercospora dematiaceous anamorph Pseudocercospora handelii - a dematiaceous anamorphic fungus (Capnodiales: Mycosphaerellaceae) UK/Ireland Dennis, R.W.G., 1995,
Ellis, M.B. & J.P., 1997 [causing brown or purple spots with broad, very dark purple margins.]
leaf (live) live leaf is spotted by concentrically arranged acervulus of Gloeosporium coelomycetous anamorph Glomerella cingulata - Willow Black Canker - causative organism (Glomerellaceae) Buczacki, S. & Harris, K., 1998 [causes large, irregular brown blotches with a distinct brown or purple margin],
Ellis, M.B. & J.P., 1997 [causes large, zonate, brown or greyish brown, purple-bordered spots]
leaf (live) live leaf is spotted by acervulus of Monochaetia coelomycetous anamorph Monochaetia karstenii - a coelomycete (Xylariales: Amphisphaeriaceae) Ellis, M.B. & J.P., 1997 [causes brown, grey or whitish, sometimes bordered, spots]
leaf (live) live leaf may have epiphytic epiphyllous thallus Cephaleuros - a genus of algal leaf spots (Trentepohliales: Trentepohliaceae) John, D.M., Whitton, B.A. & Brook, A.J., 2002,
anon., 2009
leaf (margin) leaf (margin) is grazed by nocturnal adult Otiorhynchus (Dorymerus) sulcatus - Vine Weevil (Coleoptera: Curculionidae) Major Buczacki, S. & Harris, K., 1998 [feeding produces irregular notches and holes],
RHS Gardening For All: http://www.rhs.org.uk/index.asp [Eats notches in leaf margin.]
leaf (newly dead) newly dead leaf is spotted by pycnidial anamorph Botryosphaeria rhodorae - an ascomycete (Botryosphaeriales: Botryosphaeriaceae) Ellis, M.B. & J.P., 1997 [causes brown or greyish-brown spots]
leaf (newly dead) newly dead leaf is spotted by immersed pseudothecium Botryosphaeria rhodorae - an ascomycete (Botryosphaeriales: Botryosphaeriaceae) Ellis, M.B. & J.P., 1997 [causes brown or greyish-brown spots]
leaf (semicircular or oblong pieces of live) semicircular or oblong pieces of live leaf is used to build or strengthen the nest by female Megachile - leaf-cutter and mud bees (Hymenoptera: Apidae) Buczacki, S. & Harris, K., 1998
leaf leaf may be infected and damaged by coremium of Pycnostysanus dematiacous anamorph Pycnostysanus azaleae - Rhododendron Bud Blast and Twig Blight - causative organism (Chaetothyriales: Herpotrichiellaceae) UK/Ireland Restricted Ellis, M.B. & J.P., 1997 ["Rhododendron Bud Blast" and "Twig Blight"]
leaf leaf is spotted by mycelium Phytophthora ramorum - Sudden Oak Death - causative organism, SOD (Peronosporales: Peronosporaceae) UK/Ireland Major Giltrap, P.M. et al, 2004 [cause a die-back],
Appiah, A., Jennings, P., & Turner, J.A., 2004,
anon., 2008 [causes dagger-shaped lesions on leaves]
leaf leaf is spotted by epiphyllous pycnidium of Phyllosticta coelomycetous anamorph Phyllosticta rhododendri sensu Westd. - a coelomycete (Botryosphaeriales: Botryosphaeriaceae) UK/Ireland Grove, W.B., 1935 [causes rusty-fuscous, mostly marginal spots],
Dennis, R.W.G., 1995
leaf leaf may have epiphytic superficial pseudothecium Dennisiella babingtonii - a sooty mould (Chaetothyriales: Coccodiniaceae) Ellis, M.B. & J.P., 1997 [in areas of high rainfall]
leaf leaf may have epiphytic seta-bearing mycelial mat Dennisiella babingtonii - a sooty mould (Chaetothyriales: Coccodiniaceae) Ellis, M.B. & J.P., 1997 [in areas of high rainfall]
litter litter is decayed by colony of Phaeostalagmus dematiaceous anamorph Phaeostalagmus tenuissimus - a dematiaceous anamorphic fungus (Chaetosphaeriales: Chaetosphaeriaceae) Ellis, M.B. & J.P., 1997
log (decayed) decayed log is decayed by fruitbody Crepidotus applanatus var. applanatus - Flat Oysterling (Agaricales: Inocybaceae) UK/Ireland Legon, N.W. & Henrici, A. with Roberts, P.J., Spooner, B.M. & Watling, R., 2005
petal (dead, fallen, collapsed, rotting) dead, fallen, collapsed, rotting petal is decayed by sclerotium Ovulinia azaleae - Rhododendron Petal Blight - causative organism (Helotiales: Sclerotiniaceae) UK/Ireland Buczacki, S. & Harris, K., 1998,
Ellis, M.B. & J.P., 1997
petal (live, wilting) live, wilting petal is spotted by Ovulitis anamorph Ovulinia azaleae - Rhododendron Petal Blight - causative organism (Helotiales: Sclerotiniaceae) UK/Ireland Buczacki, S. & Harris, K., 1998,
Ellis, M.B. & J.P., 1997
root (live) live root is endomycorrhizal host of mycelium Oidiodendron maius - a dematiaceous hyphomycete (Onygenales: Myxotrichaceae) UK/Ireland Rice, A.V. & Currah, R.S., 2001
stem (base, esp.) stem (base, esp.) is galled by Agrobacterium tumefaciens - Crown Gall - causative organism (Rhizobiales: Rhizobiaceae) Buczacki, S. & Harris, K., 1998
stem stem may be infected and damaged by basidiome Chondrostereum purpureum - Silverleaf Fungus (Agaricales: Cyphellaceae) Buczacki, S. & Harris, K., 1998
stump (large) (dead, decayed) dead, decayed stump (large) is decayed by caespitose fruitbody Psathyrella piluliformis - Common Stump Brittlestem (Agaricales: Psathyrellaceae) Rare Legon, N.W. & Henrici, A. with Roberts, P.J., Spooner, B.M. & Watling, R., 2005
trunk (decayed, fallen) decayed, fallen trunk is decayed by fruitbody Crepidotus applanatus var. applanatus - Flat Oysterling (Agaricales: Inocybaceae) UK/Ireland Legon, N.W. & Henrici, A. with Roberts, P.J., Spooner, B.M. & Watling, R., 2005
trunk (large) (dead, decayed) dead, decayed trunk (large) is decayed by caespitose fruitbody Psathyrella piluliformis - Common Stump Brittlestem (Agaricales: Psathyrellaceae) Rare Legon, N.W. & Henrici, A. with Roberts, P.J., Spooner, B.M. & Watling, R., 2005
twig (bark) (attached) attached twig (bark) is decayed by opening by slit pseudothecium Lembosina aulographoides - an ascomycete (Capnodiales: Asterinaceae) Ellis, M.B. & J.P., 1997
twig (cankered) cankered twig is swollen by mycelium Phytophthora ramorum - Sudden Oak Death - causative organism, SOD (Peronosporales: Peronosporaceae) UK/Ireland Major Giltrap, P.M. et al, 2004 [cause a die-back],
Appiah, A., Jennings, P., & Turner, J.A., 2004
twig (dead, often grey or purple stained) dead, often grey or purple stained twig is decayed by effuse colony of Triposporium dematiaceous anamorph Triposporium elegans - a dematiaceous anamorphic fungus (Capnodiales: Asterinaceae) Ellis, M.B. & J.P., 1997
twig (dead) dead twig is decayed by effuse colony of Belemnospora dematiaceous anamorph Belemnospora verruculosa - a dematiaceous anamorphic fungus Ellis, M.B. & J.P., 1997
twig (dead) dead twig is decayed by hysterothecium Gloniopsis praelonga - an ascomycete (Hysteriales: Hysteriaceae) Ellis, M.B. & J.P., 1997
twig (dead) dead twig is decayed by superficial, subiculate pseudothecium Protoventuria arxii - an ascomycete (Pseudosphaeriales: Venturiaceae) Ellis, M.B. & J.P., 1997
twig (fallen, dead) fallen, dead twig is decayed by effuse colony of Helminthosporium dematiaceous anamorph Helminthosporium velutinum - a dematiaceous anamorphic fungus (Pleosporales: Massarinaceae) Ellis, M.B. & J.P., 1997
twig twig may be infected and damaged by coremium of Pycnostysanus dematiacous anamorph Pycnostysanus azaleae - Rhododendron Bud Blast and Twig Blight - causative organism (Chaetothyriales: Herpotrichiellaceae) UK/Ireland Restricted Ellis, M.B. & J.P., 1997 ["Rhododendron Bud Blast" and "Twig Blight"]
wood (dead, decayed) dead, decayed wood is decayed by caespitose fruitbody Psathyrella piluliformis - Common Stump Brittlestem (Agaricales: Psathyrellaceae) Rare Legon, N.W. & Henrici, A. with Roberts, P.J., Spooner, B.M. & Watling, R., 2005
wood (dead, decayed) dead, decayed wood is decayed by fruitbody Scytinostroma ochroleucum - a resupinate fungus (Russulales: Lachnocladiaceae) Rare Legon, N.W. & Henrici, A. with Roberts, P.J., Spooner, B.M. & Watling, R., 2005
wood (dead, rotten) dead, rotten wood is decayed by effuse colony of Brachysporium dematiaceous anamorph Brachysporium dingleyae - a dematiaceous anamorphic fungus (Trichosphaeriales: Trichosphaeriaceae) Ellis, M.B. & J.P., 1997
wood (dead) dead wood is foodplant of Rhopalomesites tardyi - Holly Weevil (Coleoptera: Curculionidae) UK/Ireland Morris, M.G., 2002
wood (dead) dead wood is decayed by sessile apothecium Mollisia cinerea - Common Grey Disco (Helotiales: Dermateaceae) Ellis, M.B. & J.P., 1997
wood (dead) dead wood is decayed by synnema of Graphium dematiacous anamorph Dendrostilbella smaragdina - a discomycete (Helotiales: Helotiaceae) Ellis, M.B. & J.P., 1997
wood (dead) dead wood is decayed by apothecium Hyaloscypha leuconica - a discomycete (Helotiales: Hyaloscyphaceae) Ellis, M.B. & J.P., 1997
wood (dead) dead wood is decayed by effuse colony of Acladium anamorph Botryobasidium conspersum - a resupinate fungus (Cantharellales: Botryobasidiaceae) Ellis, M.B. & J.P., 1997
wood (decayed) decayed wood is decayed by fruitbody Crepidotus applanatus var. applanatus - Flat Oysterling (Agaricales: Inocybaceae) UK/Ireland Legon, N.W. & Henrici, A. with Roberts, P.J., Spooner, B.M. & Watling, R., 2005
wood (decayed) decayed wood is decayed by fruitbody Calocera pallidospathulata - Pale Stagshorn (Dacrymycetales: Dacrymycetaceae) UK/Ireland Legon, N.W. & Henrici, A. with Roberts, P.J., Spooner, B.M. & Watling, R., 2005
wood (rotten) rotten wood is decayed by solitary or in small groups, erumpent bcoming more or less superficial ascocarp Capronia pleiospora - an ascomycete (Chaetothyriales: Herpotrichiellaceae) Ellis, M.B. & J.P., 1997
wood (rotten) rotten wood is decayed by effuse colony of Alysidium anamorph Botryobasidium candicans - a resupinate fungus (Cantharellales: Botryobasidiaceae) Ellis, M.B. & J.P., 1997
wood wood is decayed by effuse colony of Mariannaea anamorph Mariannaea elegans - an anamorphic fungus (Hypocreales: Nectriaceae) Ellis, M.B. & J.P., 1997
wood wood is decayed by perithecium Diaporthe eres - a pyrenomycete (Diaporthales: Diaporthaceae) Ellis, M.B. & J.P., 1997 [immersed in wood with necks emerging through the bark]
wood wood is decayed by effuse colony of Veronaea dematiaceous anamorph Veronaea botryosa - a dematiaceous anamorphic fungus Ellis, M.B. & J.P., 1997

Rhododendron may be associated with more taxa listed at higher taxonomic level

PLANTAE
(plants)
TRACHEOPHYTA
(vascular plants)
MAGNOLIOPSIDA
(flowering plants)
EU-DICOTS
(dicotyledonous flowering plants)
ERICACEAE
(heaths, heathers, rhododendrons, azaleas & wintergeeens)
Evergreen trees and shrubs (via Rhododendron) Woody plants Broadleaved shrubs Broadleaved trees and shrubs Trees and shrubs Trees, shrubs, woody and climbing plants (via Broadleaved shrubs) Broadleaved trees, shrubs and climbers (via Broadleaved trees and shrubs)

References

RHS Gardening For All: http://www.rhs.org.uk/index.asp RHS Gardening For All
anon., 2008 Phytophthora diseases of trees
anon., 2009 Algal leaf spot - Cephaleuros species
Appiah, A., Jennings, P., & Turner, J.A., 2004 Phytophthora ramorum: one pathogen and many diseases, an emerging threat to forest ecosystems and ornamental plant life
Buczacki, S. & Harris, K., 1998 Pests, Diseases & Disorders of Garden Plants
Dennis, R.W.G., 1995 Fungi of the South East England
Ellis, M.B. & J.P., 1997 Microfungi on Land Plants: An Identification Handbook
Giltrap, P.M. et al, 2004 First report of Ramorum dieback (Phytophthora ramorum) on Hamamelis virginiana in the UK
Grove, W.B., 1935 British Stem- and Leaf- Fungi: Coelomycetes Vol. I … Sphaeropsidales with hyaline conidia
Hawksworth, D.L., Henrici, A. & Kirk, P.M., 1999 Melanospora pegleri, a new species from fallen Laurus and other leaves in the British Isles
Henrici, A., 2004 Notes and Records (Jan 2004)
Ing, B., 2000 Microsphaera azaleae, the perfect state of the Rhododendron mildew in England
John, D.M., Whitton, B.A. & Brook, A.J., 2002 The Freshwater Algal Flora of the British Isles
Legon, N.W. & Henrici, A. with Roberts, P.J., Spooner, B.M. & Watling, R., 2005 Checklist of the British and Irish Basidiomycota
MacLeod, A., 2006 CSL Pest Risk Analysis for Stephanitis takeyai
Moore, W.C., 1959 British Parasitic Fungi
Morris, M.G., 2002 True Weevils (Part I): Family Curculionidae, subfamilies Raymondionyminae to Smicronychinae
Rice, A.V. & Currah, R.S., 2001 Physiological and morphological variations in Oidiodendron maius
Southwood, T.R.E. & Leston, D., 1959 Land and Water Bugs of the British Isles
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