Fungal diseases
| | Alternaria blotch | Alternaria mali
{{=}} 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
{{=}} 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
{{=}} 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
{{=}} Clitocybe tabescens |
| Diaporthe canker* | Diaporthe tanakae
Phomopsis tanakae [anamorph] |
| Diplodia canker | Botryosphaeria stevensii
{{=}} Physalospora malorum
Diplodia mutila [anamorph] |
| European brown rot | Monilinia fructigena
Monilia fructigena [anamorph]
Monilinia laxa |
| Fisheye rot | Butlerelfia eustacei
{{=}} 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] |
| Gray mold rot = dry eye rot, blossom-end rot | Botrytis cinerea
Botryotinia fuckeliana [teleomorph] |
| Leptosphaeria canker and fruit rot | Diapleella coniothyrium
{{=}} Leptosphaeria coniothyrium
Coniothyrium fuckelii [anamorph] |
| Leucostoma canker and dieback | Leucostoma cinctum
Cytospora cincta [anamorph]
Valsa auerswaldii
{{=}} 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
{{=}} 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
{{=}} 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
{{=}} 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
{{=}} Pellicularia koleroga
{{=}} Hypochnus ochroleucus |
| Valsa canker | Valsa ceratosperma
Cytospora sacculus [anamorph] |
| Violet root rot | Helicobasidium mompa |
| White root rot | Scytinostroma galactinum
{{=}} Corticium galactinum |
| White rot | Botryosphaeria dothidea
Fusicoccum aesculi [anamorph] |
| X-spot = Nigrospora spot | Nigrospora oryzae |
| Zonate leaf spot | Cristulariella moricola
Grovesinia pyramidalis [teleomorph] |
|
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) |
|