Diseases of apples (Malus domestica) include:
Bacterial diseases
PseudomonadotaBlister spotPseudomonas syringae pv. papulansCrown gallAgrobacterium tumefaciensFire blightErwinia amylovoraHairy rootAgrobacterium rhizogenes MycoplasmatotaApple chat fruitPhytoplasma suspectedApple declinePhytoplasma suspectedApple proliferationPhytoplasmaRubbery woodPhytoplasma suspected
Fungal diseases
Fungal diseasesAlternaria blotchAlternaria mali A. alternata apple pathotypeAlternaria rotAlternaria alternataAmerican brown rotMonilinia fructicolaAnthracnose canker and bull's-eye rotPezicula malicorticus Cryptosporiopsis curvispora [anamorph]Apple scabVenturia inaequalis Spilocaea pomi [anamorph]Apple ring rot and cankerBotryosphaeria berengeriana PhysalosporaArmillaria root rot = shoestring root rotArmillaria melleaBitter rotGlomerella cingulata [teleomorph] (archaic) Colletotrichum gloeosporioides [anamorph]
Colletotrichum gloeosporioides species complex
Colletotrichum fructicola Colletotrichum chrysophilum
Colletotrichum acutatum species complex
Colletotrichum fioriniae Colletotrichum nymphaeaeBlack poxHelminthosporium papulosumBlack root rotXylaria mali Xylaria polymorphaBlack rot, frogeye leafspot and cankerBotryosphaeria obtusa Sphaeropsis malorum [anamorph]Blister canker = nailhead cankerBiscogniauxia marginata Nummularia discretaBlue moldPenicillium spp. Penicillium expansumBrooks fruit spotMycosphaerella pomi Cylindrosporium pomi [anamorph]Brown rot blossom blight and spur infectionMonilinia laxaCalyx-end rotSclerotinia sclerotiorumClitocybe root rotArmillaria tabescens Clitocybe tabescensDiaporthe canker*Diaporthe tanakae Phomopsis tanakae [anamorph]Diplodia cankerBotryosphaeria stevensii Physalospora malorum Diplodia mutila [anamorph]European brown rotMonilinia fructigena Monilia fructigena [anamorph] Monilinia laxaFisheye rotButlerelfia eustacei Corticium centrifugumFlyspeckSchizothyrium pomi Zygophiala jamaicensis [anamorph]Fruit blotch, leaf spot and twig cankerPhyllosticta solitariaGlomerella leaf spotGlomerella cingulata Colletotrichum gloeosporioides [anamorph]Gray mold rot = dry eye rot, blossom-end rotBotrytis cinerea Botryotinia fuckeliana [teleomorph]Leptosphaeria canker and fruit rotDiapleella coniothyrium Leptosphaeria coniothyrium Coniothyrium fuckelii [anamorph]Leucostoma canker and diebackLeucostoma cinctum Cytospora cincta [anamorph] Valsa auerswaldii Leucostoma auerswaldii Cytospora personata [anamorph]Marssonina blotchDiplocarpon coronariaeMoldy core and core rotAlternaria spp. Cladosporium spp. Coniothyrium sp. Epicoccum spp. Pleospora herbarum Stemphylium spp. Ulocladium spp.Monilia leaf blightMonilinia mali Monilia sp. [anamorph]Monochaetia twig cankerSeiridium unicorne Monochaetia mali Lepteutypa cupressi [teleomorph]Mucor rotMucor spp. Mucor piriformisNectria cankerNectria galligena Cylindrocarpon heteronemum [anamorph]Nectria twig blight = coral spotNectria cinnabarina Tubercularia vulgaris [anamorph]Peniophora root cankerPeniophora sacrataPerennial cankerNeofabraea perennans Cryptosporiopsis perennans [anamorph]Phomopsis canker, fruit decay and rough barkPhomopsis mali Diaporthe perniciosa [teleomorph]Phymatotrichum root rot = cotton root rotPhymatotrichopsis omnivora Phymatotrichum omnivorumPhytophthora crown, collar and root rot = sprinkler rotPhytophthora spp. Phytophthora cactorum Phytophthora cambivora Phytophthora cryptogea Phytophthora megasperma Phytophthora syringaePhytophthora fruit rotPhytophthora cactorum Phytophthora syringaePink mold rotTrichothecium roseum Cephalothecium roseumPowdery mildewPodosphaera leucotrichaRosellinia root rot = Dematophora root rotRosellinia necatrix Dematophora necatrix [anamorph]Rubber rotPhacidiopycnis washingtonensisRustsAmerican hawthorne rustGymnosporangium globosumCedar apple rustGymnosporangium juniperi-virginianaeJapanese apple rustGymnosporangium yamadaePacific Coast pear rustGymnosporangium libocedriQuince rustGymnosporangium clavipes...Side rotPhialophora malorumSilver leafChondrostereum purpureumSooty blotch complexPeltaster fructicola Geastrumia polystigmatis Leptodontidium elatius Gloeodes pomigenaSouthern blightSclerotium rolfsii Athelia rolfsii [teleomorph]Thread blight = Hypochnus leaf blightCorticium stevensii Pellicularia koleroga Hypochnus ochroleucusValsa cankerValsa ceratosperma Cytospora sacculus [anamorph]Violet root rotHelicobasidium mompaWhite root rotScytinostroma galactinum Corticium galactinumWhite rotBotryosphaeria dothidea Fusicoccum aesculi [anamorph]X-spot = Nigrospora spotNigrospora oryzaeZonate leaf spotCristulariella moricola Grovesinia pyramidalis [teleomorph]
Nematodes, parasitic
Nematodes, parasiticDagger nematodeXiphinema americanum Xiphinema rivesi Xiphinema vuitteneziLesion nematodePratylenchus spp. Pratylenchus penetransPin nematodeParatylenchus spp.Ring nematodeCriconemella spp.Root-knot nematodeMeloidogyne spp.
Viral diseases
Viral diseasesApple chlorotic leafspotgenus Trichovirus, Apple chlorotic leafspot virus (ACLSV)Apple dwarf (Malus platycarpa)Apple stem pitting virus (ASPV) (? not US/CAN)Apple flat applegenus Nepovirus, Cherry rasp leaf virus (CRLV)Apple mosaicgenus Ilarvirus, Apple mosaic virus (ApMV) genus Ilarvirus, Tulare apple mosaic virus (TAMV)Apple stem grooving = Apple decline of Virginia crabgenus Capillovirus, Apple stem grooving virus (ASGV)Apple stem pitting = apple Spy 227 epinasty and declineApple stem pitting virus (ASPV)Apple union necrosis and declinegenus Nepovirus, Tomato ringspot virus (ToRSV)
Viroid diseases
Viroid diseasesSwollen appleApple fruit crinkle viroid (AFCVd)Apple dimple fruitApple scar skin viroid (ASSVd)Apple fruit crinkleApple fruit crinkle viroid (AFCVd) (Japan)Apple scar skin = apple dapple, apple sabi-ka, apple bumpy fruitApple scar skin viroid (ASSVd)
Suspected viral- and viroid-like diseases
Suspected viral- and viroid-like diseasesDead spurGTP, unidentifiedFalse stingGTP, virus suspectedGreen crinkleGTP, virus suspectedRough skinGTP, virus suspectedStar crackGTP, virus suspected
Miscellaneous diseases and disorders
Miscellaneous diseases and disordersBitter pitLocalized calcium deficiencyBlossom blastBoron deficiencyBurrknotGenetically predisposed rootstockFruit crackingGeneticFruit russetFrost, sprays, etc.Green mottleUnidentifiedHollow appleHigh temperatureInternal bark necrosis = measlesLow pH and mineral nutrient imbalanceInternal browningBoron and calcium deficiencies, etc.Jonathan spotReduced by controlled atmosphere storageNarrow leafGeneticNecrotic leaf blotch of ‘Golden Delicious’Rapid synthesis of gibberellins triggered by environmental factorsSpray injurySprayStorage scaldInjury to fruit surfaces by naturally occurring gases produced by the fruitSunburnSun injury to fruitSunscaldFreezing of bark following high temperatures in winterWater coreSorbitol accumulation
References
External links Common Names of Diseases, The American Phytopathological Society