This is a list of diseases of carrots (Daucus carota subsp. sativus).
| Bacterial diseases | |
|---|---|
| Bacterial leaf blight | Xanthomonas campestris |
| Bacterial soft rot | Erwinia chrysanthemi E. carotovora subsp. carotovora = Pectobacterium carotovorum subsp. carotovorum E. carotovora subsp. atroseptica = Pectobacterium carotovorum subsp. atrosepticum |
| Carrot bacterial gall | Rhizobacter dauci |
| Carrot bacteriosis | Xanthomonas campestris pv. carotae |
| Crown gall | Agrobacterium tumefaciens |
| Hairy root | Agrobacterium rhizogenes |
| Scab | Streptomyces scabiei |
| Fungal diseases | |
|---|---|
| Alternaria leaf blight | Alternaria dauci |
| Black root rot | Thielaviopsis basicola Chalara elegans [synanamorph] |
| Black rot (black carrot root dieback) | Alternaria radicina Stemphylium radicinum |
| Blue mold rot (blue green mold) | Penicillium expansum |
| Brown rot (Phoma disease) | Leptosphaeria libanotis Phoma rostrupii [anamorph] |
| Buckshot rot | Typhula spp. |
| Canker | Thanatephorus cucumeris Rhizoctonia solani [anamorph] |
| Pythium spp. Pythium violae Rhizoctonia spp. Rhizoctonia solani | |
| Cercospora leaf spot | Cercospora carotae |
| Cottony rot | Sclerotinia minor Sclerotinia sclerotiorum |
| Crater rot | Athelia arachnoidea (anamorph = Fibulorhizoctonia carotae) |
| Crown rot | Rhizoctonia spp. Rhizoctonia solani |
| Damping off | Fusarium spp. Pythium spp. Rhizoctonia solani |
| Dieback of carrots | Pythium spp. Pythium debaryanum |
| Downy mildew | Plasmopara crustosa Plasmopara nivea |
| Forking, brown root | Pythium spp. Pythium irregulare Pythium paroecandrum Pythium sylvaticum |
| Fusarium dry rot | Fusarium sp. |
| Gray mold rot | Botryotinia fuckeliana Botrytis cinerea [anamorph] |
| Hard rot | Fusarium sp. Gliocladium roseum |
| Lateral root dieback | Pythium spp. |
| Leaf rot | Typhula variabilis |
| Leaf spot | Ramularia spp. |
| Licorice rot | Mycocentrospora acerina Centrospora acerina Sclerotinia sclerotiorum Thielaviopsis basicola Typhula spp. |
| Phytophthora root rot | Phytophthora megasperma |
| Pink mold rot | Trichothecium roseum |
| Powdery mildew | Erysiphe heraclei Erysiphe polygoni Erysiphe umbelliferarum f. dauci |
| Pythium brown rot and forking | Pythium irregulare Pythium paroecandrum Pythium sulcatum Pythium sylvaticum |
| Pythium root dieback | Pythium spp. |
| Rhizoctonia canker | Rhizoctonia solani |
| Rhizoctonia seedling disease | Rhizoctonia spp. |
| Rhizopus wooly soft rot | Rhizopus arrhizus Rhizopus oryzae Rhizopus stolonifer Rhizopus nigricans |
| Root canker | Rhizoctonia spp. |
| Root dieback | Pythium spp. |
| Root rot | Fusarium spp. Fusarium culmorum Rhizoctonia spp. Sclerotium rolfsii |
| Phymatotrichum root rot (cotton root rot) | Phymatotrichopsis omnivora Phymatotrichum omnivorum |
| Rubbery brown rot | Phytophthora cactorum P. megasperma |
| Rubbery slate rot | Pythium debaryanum |
| Rust | Aecidium foeniculi Uromyces graminis Uromyces lineolatus subsp. nearcticus Uromyces scirpi |
| Rusty root | Pythium spp. Olpidium brassicae, as vector, tobacco necrosis virus |
| Sclerotinia rot | Sclerotinia sclerotiorum Sclerotinia minor |
| Seed mold | Alternaria alternata Gibberella fujikuroi Fusarium moniliforme [anamorph] |
| Sooty rot | Aspergillus niger |
| Sour rot | Geotrichum candidum |
| Southern blight | Athelia rolfsii Sclerotium rolfsii [anamorph] |
| Stem spot | Diaporthe arctii |
| Tip rot | Numerous pathogens |
| Umbel blight | Colletotrichum gloeosporioides |
| Violet root rot | Helicobasidium brebissonii Helicobasidium purpureum Rhizoctonia crocorum [anamorph] |
| Watery soft rot | Sclerotinia minor Sclerotinia sclerotiorum Sclerotium rolfsii Botrytis cinerea |
| Nematodes, parasitic | |
|---|---|
| Cyst nematode | Heterodera carotae |
| Dagger nematode | Xiphinema |
| Lance nematode | Hoplolaimus uniformis |
| Lesion nematode | Pratylenchus penetrans Pratylenchus spp. |
| Root knot | Meloidogyne hapla |
| Sting nematode | Belonolaimus longicaudatus |
| Stubby-root nematodes | Trichodorus |
| 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) |
| Miscellaneous diseases and 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 |