Carrot
(Daucus carota L. subsp. sativus (Hoffm.) Arcang.)

J. O. Strandberg, primary collator (last update 5/25/00)

BACTERIAL DISEASES

Bacterial leaf blight

Xanthomonas campestris (Pammel 1895) Dowson 1939 pv. carotae (Kendrick) Dye

Bacterial soft rot

Erwinia chrysanthemi Burkholder et al. 1953

E. carotovora subsp. carotovora (Jones 1901) Bergey et al. 1923

     = Pectobacterium carotovorum subsp. carotovorum
     (Jones 1901) Hauben et al. 1999, comb. nov.

E. carotovora subsp. atroseptica (van Hall 1902) Dye 1969

     = Pectobacterium carotovorum subsp. atrosepticum
     (van Hall 1902) Hauben et al. 1999, comb. nov.

Carrot bacteriosis

Xanthomonas campestris (Pammel 1895) Dowson 1939 pv. carotae (Kendrick) Dye

Crown gall

Agrobacterium tumefaciens (Smith and Townsend 1907) Conn 1942

Hairy root

Agrobacterium rhizogenes (Riker et al. 1930) Conn 1942

Milky disease

Bacillus popilliae Dutky 1940 var. rhopaea

Scab

Streptomyces scabiei corrig. (ex Thaxter 1891) Lambert and
     Loria 1989, sp. nov., nom. rev.

= Streptomyces scabies (Thaxter 1891) Waksman and
     Henrici 1948

FUNGAL DISEASES

Alternaria leaf blight

Alternaria dauci (Kühn) Groves & Skolko

Black root rot

Thielaviopsis basicola (Berk. & Broome) Ferraris

     Chalara elegans Nag Raj & Kendr. [synanamorph]

Black rot (black carrot root dieback)

Alternaria radicina Meier et al.

= Stemphylium radicinum (Meier et al.) Neergaard

Blue mold rot (blue green mold)

Penicillium expansum Link

Brown rot (Phoma disease)

Leptosphaeria libanotis (Fuckel) Sacc.

     Phoma rostrupii Sacc. [anamorph]

Buckshot rot

Typhula spp.

Canker

Thanetophorus cucumeris (A.B. Frank) Donk

     Rhizoctonia solani Kühn [anamorph]

Cavity spot

Pythium spp.

Pythium violae Chester & Hickman

Rhizoctonia spp.

Rhizoctonia solani Kühn

Cercospora leaf spot

Cercospora carotae (Pass.) Solheim

Cottony rot

Sclerotinia minor Jagger

Sclerotinia sclerotiorum (Lib.) de Bary

Crater rot

Rhizoctonia carotae Rader

Crown rot

Rhizoctonia spp.

Rhizoctonia solani Kühn

Damping off

Fusarium spp.

Pythium spp.

Rhizoctonia solani Kühn

Dieback of carrots

Pythium spp.

Pythium debaryanum Auct. non R. Hesse

Downy mildew

Plasmopara crustosa (Fr.:Fr.) Jörst.

= P. nivea Auct.

Forking, brown root

Pythium spp.

Pythium irregulare Buisman

P. paroecandrum Drechs.

P. sylvaticum W. A. Campbell & J.W. Hendrix

Fusarium dry rot

Fusarium sp.

Gray mold rot

Botryotinia fuckeliana (de Bary) Whetzel

     Botrytis cinerea Pers:Fr. [anamorph]

Hard rot

Fusarium sp.

Gliocladium roseum Bainier

Lateral root dieback

Pythium spp.

Leaf rot

Typhula variabilis Riess

Leaf spot

Ramularia spp.

Licorice rot

Mycocentrospora acerina (R. Hartig) Deighton

     = Centrospora acerina (R. Hartig) A. G. Newhall

Sclerotinia sclerotiorum (Lib.) de Bary

Thielaviopsis basicola (Berk & Broome) Ferraris

Typhula spp.

Phytophthora root rot

Phytophthora megasperma Drechs.

Pink mold rot

Trichothecium roseum (Pers.:Fr.) Link

Powdery mildew

Erysiphe heraclei DC.

E. polygoni DC.

E. umbelliferaum de Bary f. dauci

Pythium brown rot and forking

Pythium irregulare Buisman

P. paroecandrum Drechs.

P. sulcatum Pratt & Mitchell

P. sylvaticum W. A. Campbell & J.W. Hendrix

Pythium root dieback

Pythium spp.

Rhizoctonia canker

Rhizoctonia solani Kühn

Rhizoctonia seedling disease

Rhizoctonia spp.

Rhizopus wooly soft rot

Rhizopus arrhizus A. Fischer

     = R. oryzae Went & Prinsen Geerligs

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

     = R. nigricans Ehrenb.

Root canker

Rhizoctonia spp.

Root dieback

Pythium spp.

Root rot

Fusarium spp.

Fusarium culmorum (Wm. G. Sm.) Sacc.

Rhizoctonia spp.

Sclerotium rolfsii Sacc.

Phymatotrichum root rot (cotton root rot)

Phymatotrichopsis omnivora (Duggar), Hennebert

= Phymatotrichum omnivorum Duggar

Rubbery brown rot

Phytophthora cactorum (Lebert & Cohn) J. Schrot.

P. megasperma Drechs.

Rubbery slate rot

Pythium debaryanum Auct. Non R. Hesse

Rust

Aecidium foeniculi Cast.

Uromyces graminis (Niessl) Dietel

U. lineolatus (Desmaz.) J. Schrot. subsp. nearcticus Savile

     = U. scirpi Burrill

Rusty root

Pythium spp.

Olpidium brassicae, as vector, tobacco necrosis virus

Sclerotinia rot

Sclerotinia sclerotiorum (Lib.) de Bary

Sclerotinia minor Jagger

Seed mold

Alternaria alternata (Fr.:Fr.) Keissl.

Gibberella fujikori (Sawada) Ito in Ito & K. Kimura

     Fusarium moniliforme J. Sheld [anamorph]

Sooty rot

Aspergillus niger Tiegh.

Sour rot

Geotrichium candidum Link.

Southern blight

Athelia rolfsii (Curzi) Tu & Kimbrough

     Sclerotium rolfsii Sacc. [anamorph]

Stem spot

Diaporthe arctii (Lasch) Mitschke

Tip rot

Numerous pathogens

Umbel blight

Colletotrichum gloeosporioides (Penz.) Sacc.

Violet root rot

Helicobasidium brebissonii (Dezmaz.) Donk =
Helicobasidium purpureum Pat.

     Rhizoctonia crocorum (Pers.:Fr.) DC [anamorph]

Watery soft rot

Sclerotinia minor Jagger

S. sclerotiorum (Lib.) de Bary

S. rolfsii Sacc.

Botrytis cinerea Pers.:Fr.

NEMATODES, PARASITIC

Cyst nematode

Heterodera carotae Jones

Lance nematode

Hoplolaimus uniformis

Lesion nematode

Pratylenchus penetrans Cobb

Pratylenchus spp.

Root knot

Meloidogyne hapla Chitwood

Sting nematode

Belonolaimus longicaudatus Rau

VIRUS AND VIROID DISEASES

Alfalfa mosaic

genus Alfamovirus, Alfalfa mosaic virus (AMV)

Carrot latent

genus Nucleorhabdovirus, Carrot latent virus (CtLtV)

Carrot mottle

genus Umbravirus, Carrot mottle virus (CMoV)

Carrot red leaf

genus Luteovirus, Carrot red leaf virus (CaRLV)

Carrot thin leaf

genus Potyvirus, Carrot thin leaf virus (CTLV)

Carrot yellow leaf

Carrot yellow leaf virus (CYLV)

Celery mosaic

genus Potyvirus, Celery mosaic virus (CeMV)

Cucumber mosaic

genus Cucumovirus, Cucumber mosaic virus (CMV)

Curly top

genus Hybrigeminivirus, Beet curly top virus (BCTV)

Motley dwarf

genus Luteovirus, Carrot red leaf virus (CaRLV)

genus Umbravirus, Carrot mottle virus (CMoV)

PHYTOPLASMAL AND SPIROPLASMAL DISEASES

Aster yellows

Aster yellows phytoplasma

PARASITIC PLANTS

Broomrape

Orobanche spp.

Dodder

Cuscuta spp.

Cuscuta arvensis Beyr.

MISCELLANEOUS DISEASES & DISORDERS

Crown rot disorder

No specific pathogen associated with this disorder

Heat canker

High soil surface temperature

Hollow black heart

Boron deficiency

Ozone injury

Ozone pollution

Root scab

Physiological

Speckled carrot

No pathogen; genetic disorder