Definitions

sooty blotch

List of apple diseases

This article is a list of diseases of apples (Malus × domestica).

Bacterial diseases

Bacterial diseases
Blister spot

Pseudomonas syringae pv. papulans
Crown gall

Agrobacterium tumefaciens
Fire blight

Erwinia amylovora
Hairy root

Agrobacterium rhizogenes

Fungal diseases

Fungal diseases
Alternaria blotch

Alternaria mali

"font-style : italic;">A. alternata apple pathotype

Alternaria rot

Alternaria alternata
American brown rot

Monilinia fructicola
Anthracnose canker and bull's-eye rot

Pezicula malicorticus
Cryptosporiopsis curvispora [anamorph]
Apple scab

Venturia inaequalis
Spilocaea pomi [anamorph]
Apple ring rot and canker

Botryosphaeria berengeriana

"font-style : italic;">Physalospora

Armillaria root rot = shoestring root rot

Armillaria mellea
Bitter rot

Glomerella cingulata
Colletotrichum gloeosporioides [anamorph]
Colletotrichum acutatum
Black pox

Helminthosporium papulosum
Black root rot

Xylaria mali
Xylaria polymorpha
Black rot, frogeye leafspot and canker

Botryosphaeria obtusa
Sphaeropsis malorum [anamorph]
Blister canker = nailhead canker

Biscogniauxia marginata

"font-style : italic;">Nummularia discreta

Blue mold

Penicillium spp.
Penicillium expansum
Brooks fruit spot

Mycosphaerella pomi
Cylindrosporium pomi [anamorph]
Brown rot blossom blight and spur infection

Monilinia laxa
Calyx-end rot

Sclerotinia sclerotiorum
Clitocybe root rot

Armillaria tabescens

"font-style : italic;">Clitocybe tabescens

Diaporthe canker*

Diaporthe tanakae
''Phomopsis tanakae [anamorph]
Diplodia canker

Botryosphaeria stevensii

"font-style : italic;">Physalospora malorum
Diplodia mutila [anamorph]

European brown rot

Monilinia fructigena
Monilia fructigena [anamorph]
Monilinia laxa
Fisheye rot

Butlerelfia eustacei

"font-style : italic;">Corticium centrifugum

Flyspeck

Schizothyrium pomi
Zygophiala jamaicensis [anamorph]
Fruit blotch, leaf spot and twig canker

Phyllosticta solitaria
Glomerella leaf spot

Glomerella cingulata
Colletotrichum gloeosporioides [anamorph]
Gay mold rot = dry eye rot, blossom-end rot

Botrytis cinerea
Botryotinia fuckeliana [teleomorph]
Leptosphaeria canker and fruit rot

Diapleella coniothyrium

"font-style : italic;">Leptosphaeria coniothyrium
Coniothyrium fuckelii [anamorph]

Leucostoma canker and dieback

Leucostoma cinctum
Cytospora cincta [anamorph]
Valsa auerswaldii

"font-style : italic;">Leucostoma auerswaldii
Cytospora personata [anamorph]

Marssonina blotch

Diplocarpon mali
Marssonina coronaria [anamorph]
Moldy core and core rot

Alternaria spp.
Cladosporium spp.
Coniothyrium sp.
Epicoccum spp.
Pleospora herbarum
Stemphylium spp.
Ulocladium spp.
Monilia leaf blight

Monilinia mali
Monilia sp. [anamorph]
Monochaetia twig canker

Seiridium unicorne

"font-style : italic;">Monochaetia mali
Lepteutypa cupressi [teleomorph]

Mucor rot

Mucor spp.
Mucor piriformis
Nectria canker

Nectria galligena
Cylindrocarpon heteronemum [anamorph]
Nectria twig blight = coral spot

Nectria cinnabarina
Tubercularia vulgaris [anamorph]
Peniophora root canker

Peniophora sacrata
Perennial canker

Neofabraea perennans
Cryptosporiopsis perennans [anamorph]
Phomopsis canker, fruit decay and rough bark

Phomopsis mali
Diaporthe perniciosa [teleomorph]
Phymatotrichum root rot = cotton root rot

Phymatotrichopsis omnivora

"font-style : italic;">Phymatotrichum omnivorum

Phytophthora crown, collar and root rot = sprinkler rot

Phytophthora spp.
Phytophthora cactorum
Phytophthora cambivora
Phytophthora cryptogea
Phytophthora megasperma
Phytophthora syringae
Phytophthora fruit rot

Phytophthora cactorum
Phytophthora syringae
Pink mold rot

Trichothecium roseum

"font-style : italic;">Cephalothecium roseum

Powdery mildew

Podosphaera leucotricha
Rosellinia root rot = Dematophora root rot

Rosellinia necatrix
Dematophora necatrix [anamorph]
Rusts
American hawthorne rust

Gymnosporangium globosum
Cedar apple rust

Gymnosporangium juniperi-virginianae
Japanese apple rust

Gymnosporangium yamadae
Pacific Coast pear rust

Gymnosporangium libocedri
Quince rust

Gymnosporangium clavipes
...
Side rot

Phialophora malorum
Silver leaf

Chondrostereum purpureum
Sooty blotch complex

Peltaster fructicola
Geastrumia polystigmatis
Leptodontidium elatius
Gloeodes pomigena
Southern blight

Sclerotium rolfsii
Athelia rolfsii [teleomorph]
Thread blight = Hypochnus leaf blight

Corticium stevensii

"font-style : italic;">Pellicularia koleroga

"font-style : italic;">Hypochnus ochroleucus

Valsa canker

Valsa ceratosperma
Cytospora sacculus [anamorph]
Violet root rot

Helicobasidium mompa
White root rot

Scytinostroma galactinum

"font-style : italic;">Corticium galactinum

White rot

Botryosphaeria dothidea
Fusicoccum aesculi [anamorph]
X-spot = Nigrospora spot

Nigrospora oryzae
Zonate leaf spot

Cristulariella moricola
Grovesinia pyramidalis [teleomorph]

Nematodes, parasitic

Nematodes, parasitic
Dagger nematode

Xiphinema americanum
Xiphinema rivesi
Xiphinema vuittenezi
Lesion nematode

Pratylenchus spp.
Pratylenchus penetrans
Pin nematode

Paratylenchus spp.
Ring nematode

Criconemella spp.
Root-knot nematode

Meloidogyne spp.

Viral diseases

Viral diseases
Apple chlorotic leafspot

genus Trichovirus, Apple chlorotic leafspot virus (ACLSV)
Apple dwarf (Malus platycarpa)

Apple stem pitting virus (ASPV) (? not US/CAN)
Apple flat apple

genus Nepovirus, Cherry rasp leaf virus (CRLV)
Apple mosaic

genus Ilarvirus, Apple mosaic virus (ApMV)
genus Ilarvirus, Tulare apple mosaic virus (TAMV)
Apple stem grooving = Apple decline of Virginia crab

genus Capillovirus, Apple stem grooving virus (ASGV)
Apple stem pitting = apple Spy 227 epinasty and decline

Apple stem pitting virus (ASPV)
Apple union necrosis and decline

genus Nepovirus, Tomato ringspot virus (ToRSV)

Viroid diseases

Viroid diseases
Apple blister bark (‘Delicious’)

Apple fruit crinkle viroid (AFCVd)
Apple dimple fruit

Apple scar skin viroid (ASSVd)
Apple fruit crinkle

Apple fruit crinkle viroid (AFCVd) (Japan)
Apple scar skin = apple dapple, apple sabi-ka, apple bumpy fruit

Apple scar skin viroid (ASSVd)

Suspected viral- and viroid-like diseases

Suspected viral- and viroid-like diseases
Dead spur

GTP, unidentified
False sting

GTP, virus suspected
Green crinkle

GTP, virus suspected
Rough skin

GTP, virus suspected
Star crack

GTP, virus suspected

Phytoplasmal diseases

Phytoplasmal diseases
Apple chat fruit

Phytoplasma suspected
Apple decline

Phytoplasma suspected
Apple proliferation

Phytoplasma
Rubbery wood

Phytoplasma suspected

Miscellaneous diseases and disorders

Miscellaneous diseases and disorders
Bitter pit

Localized calcium deficiency
Blossom blast

Boron deficiency
Burrknot

Genetically predisposed rootstock
Fruit cracking

Genetic
Fruit russet

Frost, sprays, etc.
Green mottle

Unidentified
Hollow apple

High temperature
Internal bark necrosis = measles

Low pH and mineral nutrient imbalance
Internal browning

Boron and calcium deficiencies, etc.
Jonathan spot

Reduced by controlled atmosphere storage
Narrow leaf

Genetic
Necrotic leaf blotch of ‘Golden Delicious’

Rapid synthesis of gibberellins triggered by environmental factors
Storage scald

Injury to fruit surfaces by naturally occurring gases produced by the fruit
Sunburn

Sun injury to fruit
Sunscald

Freezing of bark following high temperatures in winter
Water core

Sorbitol accumulation

References

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