List of pear diseases

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The following is a list of diseases of pears (Pyrus communis).

Bacterial diseases[edit]

Bacterial diseases
Crown gall Agrobacterium tumefaciens
Fire blight Erwinia amylovora
Pseudomonas blossom blast and canker Pseudomonas syringae pv. syringae
Pear decline Phytoplasma

Fungal diseases[edit]

Fungal diseases
Alternaria fruit rot

Alternaria spp.

Anthracnose canker and bull's-eye rot

Pezicula malicorticus
Cryptosporiopsis curvispora [anamorph]

Armillaria root rot (shoestring root rot)

Armillaria mellea
Rhizomorpha subcorticalis [anamorph]

Bitter rot

Glomerella cingulata
Colletotrichum gloeosporioides [anamorph]

Black rot, leaf spot and canker

Botryosphaeria obtusa
Sphaeropsis malorum [anamorph]

Black spot (of Japanese pear)

Alternaria alternata

Blister canker

Helminthosporium papulosum

Blister disease Coniothecium chomatosporum
Blue mold rot

Penicillium spp.
Penicillium expansum

Botrytis spur and blossom blight

Botrytis cinerea
Botryotinia fuckeliana [teleomorph]

Brown rot

Monilinia fructicola
Monilinia laxa

Cladosporium fruit rot

Cladosporium herbarum
Mycosphaerella tassiana [teleomorph]

Clitocybe root rot (mushroom root rot)

Armillaria tabescens
= Clitocybe tabescens

Coprinus rot

Coprinopsis psychromorbida

Dematophora root rot (Rosellinia root rot)

Rosellinia necatrix
Dematophora necatrix [anamorph]

Diplodia canker

Botryosphaeria stevensii
= Physalospora malorum
Diplodia mutila [anamorph]

Elsinoe leaf and fruit spot

Elsinoe piri
Sphaceloma pirinum [anamorph]

European canker

Nectria galligena
Cylindrocarpon heteronemum [anamorph]

Fabraea leaf and fruit spot

Diplocarpon mespili
= Fabraea maculata
Entomosporium mespili [anamorph]

Fly speck

Schizothyrium pomi
Zygophiala jamaicensis [anamorph]

Gibberella canker

Gibberella baccata
Fusarium lateritium [anamorph]

Gray mold rot

Botrytis cinerea

Late leaf spot

Cercospora minima

Mucor fruit rot

Mucor spp.
Mucor piriformis

Mycosphaerella leaf spot (ashy leaf spot and fruit spot)

Mycosphaerella pyri
= Mycosphaerella sentina
Septoria pyricola [anamorph]

Nectria twig blight (coral spot)

Nectria cinnabarina
Tubercularia vulgaris [anamorph]

Pear scab

Venturia pirina
Fusicladium pyrorum [anamorph]

Perennial canker

Neofabraea perennans
Cryptosporiopsis perennans [anamorph]

Phyllosticta leaf spot

Phyllosticta sp.

Phytophthora crown and root rot (sprinkler rot)

Phytophthora cactorum

Pink mold rot

Trichothecium roseum
= Cephalothecium roseum

Powdery mildew

Podosphaera leucotricha

Pythium dieback

Pythium spp.

Rhizopus rot

Rhizopus stolonifer

Rust, American hawthorne

Gymnosporangium globosum

Rust, Kern's pear

Gymnosporangium kernianum

Rust, Pacific Coast pear

Gymnosporangium libocedri

Rust, pear trellis (European pear rust)

Gymnosporangium fuscum

Rust, Rocky Mountain pear

Gymnosporangium nelsonii

Side rot

Phialophora malorum

Silver leaf

Chondrostereum purpureum

Sooty blotch

Gloeodes pomigena

Thread blight (Hypochnus leaf blight)

Corticium stevensii
= Pellicularia koleroga
= Hypochnus ochroleucus

Valsa canker

Valsa ceratosperma
Cytospora sacculus [anamorph]

Wood rot

Trametes versicolor
and various basidiomycetes

Xylaria root rot

Xylaria spp.

Miscellaneous diseases and disorders[edit]

Miscellaneous diseases and 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[edit]

Nematodes, parasitic
Dagger, American

Xiphinema americanum

Dagger

Xiphinema riveri
Xiphinema vuittenezi

Lesion

Pratylenchus spp.
Pratylenchus penetrans

Pin

Paratylenchus spp.

Root-knot

Meloidogyne spp.

Viruslike diseases[edit]

Viruslike diseases
Flemish beauty corky pit Virus suspected
Pear blister canker Virus suspected
Pear decline Phytoplasma
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

References[edit]