Diseases of Apricot
(Prunus armeniaca L.)

J. M. Ogawa, J. K. Uyemoto, and B. A. Jaffee, primary collators (last update 4/8/03)

BACTERIAL DISEASES

Bacterial canker and blast

Pseudomonas syringae pv. syringae van Hall

Bacterial spot

Xanthomonas airboricola pv. Pruni (Smith) vauterin et. al.

= X. campestris pv. pruni (Smith) Dye

Crown gall

Agrobacterium tumefaciens (Smith & Townsend) Conn

FUNGAL DISEASES

Alternaria spot and fruit rot

Alternaria alternata (Fr.:Fr.) Keissl.

Armillaria crown and root rot (shoestring crown and root rot)

Armillaria mellea (Vahl:Fr.) P. Kumm.

    Rhizomorpha subcorticalis Pers. [anamorph]

Brown rot blossom and twig blight and fruit rot

Monilinia fructicola (G. Wint.) Honey

M. laxa (Aderhold) & Ruhland) Honey

Ceratocystis canker

Ceratocystis fimbriata Ellis & Halst.

Cytospora canker

Cytospora leucostoma Sacc.

    Leucostoma persoonii Höhn. [teleomorph]

Dematophora root rot

Rosellinia necatrix Prill.

    Dematophora necatrix R. Hartig [anamorph]

Eutypa dieback

Eutypa lata (Pers.:Fr.) Tul. & C. Tul.

    Cytosporina spp. [anamorph]

Green fruit rot

Botrytis cinerea Pers.:Fr.

    Botryotinia fuckeliana (de Bary) Whetzel [teleomorph]

Sclerotinia sclerotiorum (Lib.) de Bary

Leaf spot

Phyllosticta circumscissa Cooke

Phytophthora crown and root rot

Phytophthora cactorum (Lebert & Cohn) J. Schrot.

P. cambivora (Petri) Buisman

P. cinnamomi Rands

P. citricola Sawada

P. dreschsleri Tucker

P. megasperma Drechs.

P. syringae (Kleb.) Kleb.

Phytophthora pruning wound canker

Phytophthora syringae (Kleb.) Kleb.

Powdery mildew

Podosphaera clandestina (Wallr.:Fr.) Lev.

    Oidium sp. [anamorph]

Sphaerotheca pannosa (Wallr.:Fr.) Lév.

    O. leucoconium Desmaz. [anamorph]

Replant problems

Fungi and others (see under Miscellaneous Disorders)

Rhizopus fruit rot

Rhizopus arrhizus A. Fischer

R. circinans Tiegh.

R. stolonifer (Ehrenb.:Fr.) Vuill.

Ripe fruit rot

Aspergillus niger Tiegh.

Cladosporium spp.

Mucor spp.

Penicillium expansum Link

P. italicum Wehmer

Scab

Cladosporium carpophilum Thuem.

    Venturia carpophilia E. E. Fisher [teleomorph]

Shot hole

Wilsonomyces carpophilus (Lév) Adaskaveg, Ogawa, and

    E. E. Butler

= Stigmina carpophilia (Lév.) Ellis

Silver leaf

Chondrostereum purpureum (Pers.:Fr.) Pouzar

Verticillium wilt

Verticillium dahliae Kleb.

Wood rots (pathogenicity has not been proven for these fungi)

Cerrena unicolor (Bull.:Fr.) Murrill

Coprinus spp.

Coriolopsis gallica (Bull.:Fr.) Ryvarden

Daedaleopsis confragosa (Bolten:Fr) J. Schröt.

Dendrophora albabadia (Schwein.:Fr.) Chamuris

D. erumpens (Burt) Chamuris

Fomes fomentarius (L.:Fr.) J. Kickx fil.

Fomitopsis cajanderi (P. Karst.) Kotlaba & Pouzar

F. pinicola (Sw.:Fr.) P. Karst.

F. rosea (Albertini & Schwein.:Fr.) P. Karst.

Ganoderma applanatum (Pers.) Pat.

G. lucidum (Curtis:Fr.) P. Karst.

Gloeophyllum sepiarium (Wulfen:Fr.) P. Karst.

G. trabeum (Pers.:Fr.) Murrill

Gloeoporus dichrous (Fr.:Fr.) Bres.

Grandinia granulosa (Pers.:Fr.) Fr.

= Hyphodontia aspera (Fr.) J. Erikss.L

Heterobasidion annosum (Fr.:Fr.) Bref. (unconfirmed)

Hyphodermella corrugata (Fr.) J. Eriksson & Ryvarden

Inonotus dryophilus (Berk.) Murrill

Irpex lacteus (Fr.:Fr.) Fr.

Laetiporus sulphureus (Bull.:Fr.) Murrill

Oxyporus corticola (Fr.:Fr.) Ryvarden

O. latemarginatus (Durieu & Mont.) Donk

O. populinus (Schumach:Fr.) Donk

Perenniporia fraxinophila (Peck) Ryvarden

P. medulla-panis (Jacq.:Fr.) Donk

Phellinus ferreus (Pers.) Bourd. & Galzin

P. ferruginosus (Schrad.:Fr.) Pat.

P. gilvus (Schwein.:Fr.) Pat.

P. igniarius (L.:Fr.) Quél.

P. pomaceus (Pers.) Maire

Pholiota spp.

P. varius Fr.

Pycnoporus cinnabarinus (Jacq.:Fr.) P. Karst.

Schizophyllum commune Fr.:Fr.

Stereum spp.

Trametes elegans (Spreng.:Fr.) Fr.

T. hirsuta (Wulfen.:Fr.) Quel.

T. versicolor (L.:Fr.) Pilát

NEMATODE DISEASES

Dagger

Xiphinema americanum Cobb

X. rivesi Dalmasso

Lesion

Pratylenchus vulnus Allen & Jensen

Ring

Criconemella xenoplax (Raski) Luc & Raski

Root-knot

Meloidogyne arenaria (Neal) Chitwood

M. incognita (Kofoid & White) Chitwood

M. javanica (Treub) Chitwood

VIRAL DISEASES

(includes uncharacterized graft-transmissible pathogens [GTP])

 

Bare twig and unfruitfulness

genus Nepovirus, Strawberry latent ringspot virus

                                        +

genus Tobamovirus, Cucumber green mottle mosaic virus

Line pattern & Necrotic ring spot

genus Ilarvirus, Prunus necrotic ringspot virus (PNRSV)

Peach mosaic

genus Trichovirus, Cherry mottle leaf virus (CMLV)

Plum pox (= Sharka)

genus Potyvirus, Plum pox virus (PPV)

Prunus stem pitting

genus Nepovirus, Tomato ringspot virus (ToRSV)

Pseudopox

genus Trichovirus, Apple chlorotic leaf spot virus (ACLSV)

Viral gummosis

genus Ilarvirus, Prune dwarf virus (PDV)

 

GTP

  Asteroid spot (= Peach asteroid spot)

  Cherry mottle leaf

  Chlorotic leaf mottle

  Deformation mosaic (associated with an isometric particle)

  Moorpark mottle

  Peach yellow mottle

  Pucker leaf

  Ring pox (= Spur cherry?)

  Stone pitting

PHYTOPLASMAL DISEASES

Chlorotic leaf roll (= Apple proliferation)

Witches' broom

PARASITIC HIGHER PLANTS

Mistletoe

Phoradendron flavescens (Pursh.) Nutt.

MISCELLANEOUS DISEASES OR DISORDERS

Apricot gumboil

Unknown etiology (nontransmissible)

Replant problems

Bacteria, fungi, nematodes, viruses, nutrients, toxins and environmental conditions (?)