Common Names of Plant Diseases


Diseases of Pear (Pyrus communis L.)



BACTERIAL DISEASES

Crown gall
Agrobacterium tumefaciens (Smith & Townsend) Conn
Fire blight
Erwinia amylovora (Burrill) Winslow et al.
Pseudomonas blossom blast and canker
Pseudomonas syringae pv. syringae van Hall

FUNGAL DISEASES

Alternaria fruit rot
Alternaria spp.
Anthracnose canker and bull's-eye rot
Pezicula malicorticus (H. Jacks) Nannf.
(anamorph: Cryptosporiopsis curvispora (Peck) Gremmen in
    Boerema & Gremmen)
Armillaria root rot (shoestring root rot)
Armillaria mellea (Vahl:Fr.) P. Kumm.
(anamorph: Rhizomorpha subcorticalis Pers.)
Bitter rot
Glomerella cingulata (Stoneman) Spauld. & Schrenk
(anamorph: Colletotrichum gloeosporioides (Penz.) Penz. &
    Sacc. in Penz.
Black rot, leaf spot and canker
Botryosphaeria obtusa (Schwein.) Shoemaker
(anamorph: Sphaeropsis malorum Berk.)
Black spot (of Japanese pear)*
Alternaria alternata (Fr.:Fr.) Keissl.
Blister canker
Helminthosporium papulosum Berg.
Blister disease*
Coniothecium chromatosporum Corda
Blue mold rot
Penicillium spp.
P. expansum Link
Botrytis spur and blossom blight
Botrytis cinerea Pers.:Fr.
(teleomorph: Botryotinia fuckeliana (de Bary) Whetzel)
Brown rot
Monilinia fructicola (Wint.) Honey
M. laxa (Aderh. & Ruhl.) Honey
Cladosporium fruit rot
Cladosporium herbarum (Pers.:Fr.) Link
(teleomorph: Mycosphaerella tassiana (De Not.) Johans.)
Clitocybe root rot (mushroom root rot)
Armillaria tabescens (Scop.) Dennis et al.
= Clitocybe tabescens (Scop.) Bres.
Coprinus rot
Coprinus psychromorbidus Redhead & Traquair
Dematophora root rot (Rosellinia root rot)
Rosellinia necatrix Prill.
(anamorph: Dematophora necatrix R. Hartig)
Diplodia canker
Botryosphaeria stevensii Shoemaker
= Physalospora malorum Shear et al.
(anamorph: Diplodia mutila (Fr.:Fr.) Mont.)
Elsinoe leaf and fruit spot
Elsinoe piri (Woronichin) Jenk.
(anamorph: Sphaceloma pirinum Jenk.)
European canker
Nectria galligena Bres. in Strass.
(anamorph: Cylindrocarpon heteronemum (Berk. &
    Broome) Wollenweb.)
Fabraea leaf and fruit spot
Diplocarponmespili (Sorauer) Sutton
= Fabraea maculata Atk.
(anamorph: Entomosporium mespili (DC.) Sacc.)
Fly speck
Schizothyrium pomi (Mont.:Fr.) Arx
(anamorph: Zygophiala jamaicensis E. Mason)
Gibberella canker
Gibberella baccata (Wallr.) Sacc.
(anamorph: Fusarium lateritium Nees:Fr.)
Gray mold rot
Botrytis cinerea Pers.:Fr.
Late leaf spot
Cercospora minima Tracy & Earle
Mucor fruit rot
Mucor spp.
M. piriformis E. Fischer
Mycosphaerella leaf spot (ashy leaf spot and fruit spot)
Mycosphaerella pyri (Auersw.) Boerema
= M. sentina (Fr.:Fr.) Schrot.
(anamorph: Septoria pyricola (Desmaz.) Desmaz.)
Nectria twig blight (coral spot)
Nectria cinnabarina (Tode) Fr.
(anamorph: Tubercularia vulgaris Tode)
Pear scab
Venturia pirina Aderh.
(anamorph: Fusicladium pyrorum (Lib.) Fuckel)
Perennial canker
Neofabrae perennans Kienholz
(anamorph: Cryptosporiopsis perennans (Zeller & Childs)
    Wollenweb.)
Phyllosticta leaf spot
Phyllosticta sp.
Phytophthora crown and root rot (sprinkler rot)
Phytophthora cactorum (Lebert & Cohn) J. Schrot.
Pink mold rot
Trichothecium roseum (Pers.:Fr.) Link
= Cephalothecium roseum Corda
Powdery mildew
Podosphaera leucotricha (Ellis & Everh.) E.S. Salmon
Pythium dieback
Pythium spp.
Rhizopus rot
Rhizopus stolonifer (Ehrenb.:Fr.)Vuill.
Rust, American hawthorne
Gymnosporangium globosum (Farl.) Farl.
Rust, Kern's pear
Gymnosporangium kernianum Bethel
Rust, Pacific Coast pear
Gymnosporangium libocedri (C. Henn.) F. Kern
Rust, pear trellis (European pear rust)
Gymnosporangium fuscum R. Hedw. in DC.
Rust, Rocky Mountain pear
Gymnosporangium nelsonii Arth.
Side rot
Phialophora malorum (M.N. Kidd & A. Beaumont) McColloch
Silver leaf
Chondrostereum pupureum (Pers.:Fr.) Pouzar
Sooty blotch
Gloeodes pomigena (Schwein.) Colby
Thread blight (Hypochnus leaf blight)
Corticiumstevensii Burt
= Pellicularia koleroga Cooke
= Hypochnus ochroleucus Noack
Valsa canker
Valsa ceratosperma (Tode:Fr.) Maire
(anamorph: Cytospora sacculus (Schwein.) Gvritischvili)
Wood rot
Trametes versicolor (L.:Fr.) Pilat and various basidiomycetes
Xylaria root rot
Xylaria spp.

MISCELLANEOUS DISEASES OR DISORDERS

Alfalfa greening (green stain)
Unknown
Bitter pit
Localized calcium deficiency
Black end
Water imbalance
Black speck (skin speckling)
Associated with low oxygen in storage
Blossom blast
Boron deficiency
Brown core
High CO2
Core breakdown (Bartlett)
Senescence
Core spot
Associated with calcium deficiency
Green stain
Unknown
Internal bark necrosis
Unknown
Mealy core (d`Anjou)
Senescence
Pink end (Bartlett)
Preharvest low temperature
Rosette
Unknown
Scald
Senescence

NEMATODES, PARASITIC

Dagger, American
Xiphinema americanum Cobb.
Dagger
X. riveri Dalmasso
X. vuittenezi Luc et al.
Lesion
Pratylenchus spp.
P. penetrans (Cobb) Filipjev & Schuurmans-Stekhoven
Pin
Paratylenchus spp.
Root-knot
Meloidogyne spp.

VIRUSLIKE DISEASES

(Also mycoplasmalike organism [MLO])
Flemish beauty corky pit
Virus suspected
Pear blister canker
Virus suspected
Pear decline
MLO
Pear freckle pit
Virus suspected
Pear red mottle
Virus suspected
Pear ring pattern mosaic
Virus suspected
Pear rough bark
Virus suspected
Pear stony pit
Virus suspected
Pear vein yellows
Virus suspected
Quince bark necrosis
Virus suspected
Quince sooty ring spot
Virus suspected
Quince stunt
Virus suspected
Quince yellow blotch
Virus suspected

*Not known to occur naturally on pear in the United States.

 

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