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

J. J. Nunez and R. M. Davis, primary collators (last update: 4/18/16)

BACTERIAL DISEASES

Bacterial leaf blight

Xanthomonas hortorum pv. carotae (Kendrick) Vauterin et al.

       (syn. X. campestris (Pammel) Dowson pv. carotae (Kendrick) Dye)

Bacterial soft rot

Dickeya dadantii Samson et al.

       (syns. D. chrysanthemi (Burkholder et al.) Samson et al.; Erwinia chrysanthemi

       Burkholder et al.)

Pectobacterium carotovorum subsp. carotovorum (Jones) Hauben et al.

       (syn. Erwinia carotovora subsp. carotovora (Jones) Bergey et al.)

Pectobacterium atrosepticum (van Hall) Garden et al.

       (syns. Erwinia carotovora subsp. atroseptica (van Hall) Dye; P. carotovorum

       subsp. atrosepticum (van Hall) Hauben et al.)

Crown gall

Agrobacterium tumefaciens (Smith & Townsend) Conn

Hairy root

Agrobacterium rhizogenes (Riker et al.) Conn

Scab

Streptomyces scabiei (Thaxter) Lambert & Loria

       (syn. Streptomyces scabies (Thaxter) Waksman & Henrici)

FUNGAL and OOMYCETE DISEASES

Alternaria leaf blight

Alternaria dauci (J. G. Kühn) J. W. Groves & Skolko

Black root rot

Thielaviopsis basicola (Berk. & Broome) Ferraris

       (syn. Chalara elegans Nag Raj & Kendr.)

Black rot

Alternaria radicina Meier, Drechsler & E. D. Eddy

       (syn. Stemphylium radicinum (Meier, Drechsler & E. D. Eddy) Neerg.)

Blue mold rot

Penicillium expansum Link

Brown rot

Plenodomus libanotidis (Fuckel) Gruyter, Aveskamp & Verkley

       (syn. Leptosphaeria libanotis (Fuckel) Niessl)

Buckshot rot

Typhula spp.

Canker

Rhizoctonia solani J. G. Kühn

        (syn. Thanatephorus cucumeris (A. B. Frank) Donk)

Cavity spot

Globisporangium ultimum (Trow) Uzuhashi, Tojo & Kakish.

       (syn. Pythium ultimum Trow)

Globisporangium violae (Chesters & Hickman) Uzuhashi, Tojo & Kakish.

       (syn. Pythium violae Chester & Hickman)

Pythium sulcatum R. G. Pratt & J. E. Mitchell

Pythium spp.

Cercospora leaf spot

Cercospora carotae (Pass.) Kazn. & Siemaszko

Cottony rot

Sclerotinia minor Jagger

Sclerotinia sclerotiorum (Lib.) de Bary

Crater rot

Athelia arachnoidea (Berk.) Jülich

       (syns. Fibularhizoctonia carotae (Rader) Adams & Kropp; Rhizoctonia carotae Rader)

Damping-off

Fusarium spp.

Pythium spp.

Rhizoctonia solani J. G. Kühn

        (syn. Thanatephorus cucumeris (A. B. Frank) Donk)

Downy mildew

Plasmopara crustosa (Fr.) Jörst.

P. nivea (Unger) J. Schröt.

Fusarium dry rot

Fusarium sp.

Gray mold

Botrytis cinerea Pers.:Fr.

       (syn. Botryotinia fuckeliana (de Bary) Whetzel)

Hard rot

Fusarium sp.

Gliocladium roseum Bainier

       (syn. G. aureum Rader)

Leaf rot

Typhula variabilis Riess

Leaf spot (Ramularia leaf spot)

Ramularia spp.

Licorice rot

Mycocentrospora acerina (R. Hartig) Deighton

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

Phymatotrichum root rot

Phymatotrichopsis omnivora (Duggar) Hennebert

       (syn. Phymatotrichum omnivorum Duggar)

Phytophthora root rot

Phytophthora cactorum (Lebert & Cohn) J. Schröt.

Phytophthora spp.

Pink mold rot

Trichothecium roseum (Pers.) Link

Powdery mildew

Erysiphe heraclei DC.

Erysiphe polygoni DC.

       (syn. E. umbelliferum (Lev.) de Bary)

Leveillula lanuginosa (Fuckel) Golovin

Leveillula taurica (Lev.) G. Arnaud

Rhizoctonia root canker

Rhizoctonia solani J. G. Kühn

       (syn. Thanatephorus cucumeris (A. B. Frank) Donk)

Rhizopus wooly soft rot

Rhizopus arrhizus A. Fischer

       (syn. R. oryzae Went & Prins. Geerl.)

Rhizopus stolonifer (Ehrenb.) Vuill.

       (syn. R. nigricans Ehrenb.)

Root dieback

Globisporangium irregulare (Buisman) Uzuhashi, Tojo & Kakish.

       (syn. Pythium irregulare Buisman)

Globisporangium paroecandrum (Drechsler) Uzuhashi, Tojo & Kakish.

       (syn. Pythium paroecandrum Drechsler)

Globisporangium sylvaticum (W. A. Campbell & F. F. Hendrix) Uzuhashi, Tojo & Kakish.

       (syn. Pythium sylvaticum W. A. Campbell & F. F. Hendrix)

Globisporangium ultimum (Trow) Uzuhashi, Tojo & Kakish.

       (syn. Pythium ultimum Trow)

Pythium spp.

Rhizoctonia solani J. G. Kühn

       (syn. Thanatephorus cucumeris (A. B. Frank) Donk)

Rubbery slate rot

Globisporangium debaryanum (R. Hesse) Uzuhashi, Tojo & Kakish.

       (syn. Pythium debaryanum R. Hesse)

Rust

Aecidium foeniculi Castagne

Uromyces graminis (Niessl) Dietel

Uromyces lineolatus (Desm.) J. Schröt. subsp. nearcticus Savile

       (syn. U. scirpi Burrill)

Rusty root

Olpidiaster brassicae (Woronin) Doweld (as vector of Tobacco necrosis virus)

       (syn. Olpidium brassicae (Woronin) P. A. Dang.)

Seed mold

Alternaria alternata (Fr.) Keissl.

Fusarium moniliforme J. Sheld.

       (syn. Gibberella fujikuroi (Sawada) Wollenw.)

Sooty rot

Aspergillus niger Tiegh.

Sour rot

Geotrichum candidum Link.

       (syn. Dipodascus geotrichum (E. E. Butler & L. J. Petersen) Arx)

Southern blight

Athelia rolfsii (Curzi) C. C. Tu & Kimbr.

       (syn. Sclerotium rolfsii Sacc.)

Stem spot

Diaporthe arctii (Lasch) Nitschke

       (syn. Phomopsis arctii (Lasch) Traverso)

Umbel blight

Colletotrichum gloeosporioides (Penz.) Penz. & Sacc.

Violet root rot

Helicobasidium purpureum (Tul.) Pat.

       (syns. H. brebissonii (Desm.) Donk; Rhizoctonia crocorum (Pers.) DC.)

MISCELLANEOUS DISEASES AND DISORDERS

Heat canker

High soil surface temperature

Hollow black heart

Boron deficiency

Ozone injury

Ozone pollution

Speckled carrot

Genetic disorder

NEMATODES, PARASITIC

Cyst nematode

Heterodera carotae Jones

Lance nematode

Rotylenchus robustus de Man

Lesion nematode

Pratylenchus penetrans Cobb

Pratylenchus spp.

Needle nematode

Longidorus africanus Merny

Root-knot nematode

Meloidogyne arenaria (Neal) Chitwood

M. hapla Chitwood

M. incognita (Kofoid & White) Chitwood

M. javanica (Treub) Chitwood

Sting nematode

Belonolaimus longicaudatus Rau

Stubby-root nematode

Paratrichodorus sp.

PARASITIC PLANTS

Broomrape

Orobanche spp.

Dodder

Cuscuta arvensis Beyr.

Cuscuta spp.

PHYTOPLASMAL DISEASE

Aster yellows

Aster yellows phytoplasma

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 Polerovirus, Carrot red leaf virus (CtRLV)

Carrot thin leaf

Genus Potyvirus, Carrot thin leaf virus (CTLV)

Carrot yellow leaf

Genus Closterovirus, Carrot yellow leaf virus (CYLV)

Celery mosaic

Genus Potyvirus, Celery mosaic virus (CeMV)

Cucumber mosaic

Genus Cucumovirus, Cucumber mosaic virus (CMV)

Curly top

Genus Curtovirus, Beet curly top virus (BCTV)

Motley dwarf

Genus Polerovirus, Carrot red leaf virus (CtRLV)

Genus Umbravirus, Carrot mottle virus (CMoV)

Parsnip yellow fleck

Genus Sequivirus, Parsnip yellow fleck virus (PYFV)

Tobacco necrosis

Genus Necrovirus, Tobacco necrosis virus (TNV)