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

Bacterial diseases

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

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

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

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

Phytoplasmal and spiroplasmal diseases
Aster yellows Aster yellows phytoplasma
Witches'-broom Phytoplasma

See also

References

Category