List of alfalfa diseases

This article is a list of diseases of alfalfa (Medicago sativa).

## Bacterial diseases

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Bacterial diseases

Bacterial leaf spot  | Xanthomonas campestris pv. alfalfae
Bacterial sprout rot  | Erwinia chrysanthemi pv. chrysanthemi
Bacterial stem blight  | Pseudomonas savastanoi pv. phaseolicola = P. medicaginis
Bacterial wilt  | Clavibacter michiganensis subsp. insidiosus = Corynebacterium insidiosum
Crown gall  | Agrobacterium tumefaciens
Crown and root rot complex  | Pseudomonas viridiflava
Dwarf  | Xylella fastidiosa

## Fungal diseases

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Fungal diseases

Acrocalymma root and crown rot  |

Acrocalymma medicaginis
Massarina walkeri [teleomorph]

Anthracnose  | Colletotrichum trifolii
Aphanomyces root rot  | Aphanomyces euteiches
Black patch  | Rhizoctonia leguminicola
Black root rot  |

Thielaviopsis basicola
Chalara elegans [synanamorph]

Blossom blight  |

Botrytis cinerea
Botryotinia fuckeliana [teleomorph]
Sclerotinia sclerotiorum

Brown root rot  | Phoma sclerotioides = Plenodomus meliloti
Crown and root rot complex  |

Fusarium acuminatum
Gibberella acuminata [teleomorph]
Fusarium avenaceum
Gibberella avenacea [teleomorph]
Fusarium equiseti
Fusarium oxysporum
Fusarium sambucinum
Fusarium solani
Nectria haematococca [teleomorph]
Fusarium spp.
Phoma medicaginis
Pythium spp.
Rhizoctonia solani
Thanatephorus cucumeris [teleomorph]
Thielaviopsis basicola
Chalara elegans [synanamorph]

Charcoal rot  | Macrophomina phaseolina
Common leaf spot  | Pseudopeziza medicaginis
Corky root rot  | Xylaria sp.
Crown wart  | Physoderma alfalfae

= Urophlyctis alfalfae

Cylindrocarpon root rot  |

Cylindrocarpon magnusianum
= Cylindrocarpon ehrenbergii
Nectria ramulariae [teleomorph]

Cylindrocladium root and crown rot  | Cylindrocladium crotalariae

Calonectria crotalariae [teleomorph]

Damping-off  |

Fusarium acuminatum
Gibberella acuminata [teleomorph]
Mycoleptodiscus terrestris
Phytophthora medicaginis
Phytophthora megasperma f.sp. medicaginis
Pythium spp.
Pythium debaryanum
Pythium irregulare
Pythium splendens
Pythium ultimum
Rhizoctonia solani
Thanatephorus cucumeris [teleomorph]

Downy mildew  | Peronospora trifoliorum
Fusarium wilt  | Fusarium oxysporum f.sp. medicaginis
Lepto leaf spot  | Leptosphaerulina trifolii
Marasmius root rot  | Marasmius sp.
Mycoleptodiscus crown and root rot  | Mycoleptodiscus terrestris
Myrothecium root rot  |

Myrothecium roridum
Myrothecium verrucaria

Phymatotrichum root rot = cotton root rot = Texas root rot  |

Phymatotrichopsis omnivora
= Phymatotrichum omnivorum

Phytophthora root rot  |

Phytophthora medicaginis
Phytophthora megasperma f.sp. medicaginis

Powdery mildew  |

Erysiphe pisi
Leveillula taurica

Rhizoctonia root rot and stem blight  |

Rhizoctonia solani
Thanatephorus cucumeris [teleomorph]

Rhizopus sprout rot  | Rhizopus stolonifer
Rust  |

Uromyces striatus
= Uromyces medicaginis
= Uromyces oblongus
= Uromyces striatus var. medicaginis

Sclerotinia crown and stem rot  |

Sclerotinia trifoliorum
Sclerotinia sclerotiorum

Southern blight  |

Sclerotium rolfsii
Athelia rolfsii [teleomorph]

Spring black stem and leaf spot  | Phoma medicaginis
Stagonospora leaf spot and root rot  |

Stagonospora meliloti
Phoma meliloti [synanamorph]
Leptosphaeria pratensis [teleomorph]

Stemphylium leaf spot  |

Pleospora spp.
Stemphylium alfalfae
Pleospora alfalfae[teleomorph]
Stemphylium botryosum
Pleospora tarda [teleomorph]
Stemphylium globuliferum
Stemphylium herbarum
Pleospora herbarum [teleomorph]
Stemphylium vesicarium species complex

Summer black stem and leaf spot  | Cercospora medicaginis
Verticillium wilt  |

Verticillium albo-atrum
Verticillium dahliae

Violet root rot  |

Helicobasidium brebissonii
Rhizoctonia crocorum[anamorph]

Winter crown rot = Coprinus snow mold | Coprinus psychromorbidus
Yellow leaf blotch  |

Leptotrochila medicaginis
= Pyrenopeziza medicaginis
= Pseudopeziza jonesii
Sporonema phacidioides [anamorph]

## Nematodes, parasitic

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Nematodes, parasitic

Bulb and stem nematode  |

Ditylenchus dipsaci

Chrysanthemum foliar nematode  |

Aphelenchoides ritzemabosi

Cyst nematode  |

Heterodera trifolii

Dagger nematode  |

Xiphinema americanum

Lesion nematode  |

Pratylenchus spp.
Pratylenchus neglectus
Pratylenchus penetrans

Needle nematode  | Longidorus spp.
Pin nematode  |

Paratylenchus spp.
Paratylenchus hamatus

Reniform nematode  |

Rotylenchulus spp.

Root-knot nematode  |

Meloidogyne spp.
Meloidogyne arenaria
Meloidogyne chitwoodi
Meloidogyne hapla
Meloidogyne incognita
Meloidogyne javanica

Spiral nematode  |

Helicotylenchus spp.

Stubby-root nematode  |

Paratrichodorus spp.

Stunt nematode  |

Tylenchorhynchus spp.

## Viral diseases

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Viral diseases

Alfalfa enation  | genus Rhabdovirus, Alfalfa enation virus (AEV)
Alfalfa mosaic | genus Alfamovirus, Alfalfa mosaic virus (AMV)
Bean leaf roll  | genus Luteovirus, Bean leaf roll virus (BLRV)
Bean yellow mosaic  | genus Potyvirus, Bean yellow mosaic virus (BYMV)
Cucumber mosaic  | genus Cucumovirus, Cucumber mosaic virus (CMV)
Lucerne Australian latent  | genus Nepovirus, Lucerne Australian latent virus (LALV)
Lucerne Australian symptomless  | genus Comoviridae, Lucerne Australian symptomless virus (LASV)
Lucerne transient streak  | genus Sobemovirus, Lucerne transient streak virus (LTSV)
Pea streak  | genus Carlavirus, Pea streak virus (PSV)
Red clover vein mosaic  | genus Carlavirus, Red clover vein mosaic virus (RCVMV)
Tobacco streak  | genus Ilarvirus, Tobacco streak virus (TSV)
White clover mosaic  | genus Potexvirus, White clover mosaic virus (WCMV)

## Phytoplasmal and spiroplasmal diseases

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Phytoplasmal and spiroplasmal diseases

Aster yellows  | Aster yellows phytoplasma
Witches'-broom  | Phytoplasma

## See also

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* Alfalfa pests, pests named for alfalfa

## References

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* Common Names of Diseases, The American Phytopathological Society