This article is a list of diseases of the cultivated oat Avena sativa.
| Bacterial diseases | |
|---|---|
| Bacterial blight (halo blight) | Pseudomonas coronafaciens pv. coronafaciens |
| Bacterial stripe blight | Pseudomonas coronafaciens pv. striafaciens |
| Black chaff and bacterial streak (stripe) | Xanthomonas campestris pv. translucens |
| Fungal diseases | |
|---|---|
| Anthracnose | Colletotrichum graminicola Glomerella graminicola [teleomorph] |
| Blast | Unfavorable environmental conditions and/or any of several pathogens |
| Downy mildew | Sclerophthora macrospora |
| Ergot | Claviceps purpurea Sphacelia segetum [anamorph] |
| Fusarium foot rot | Fusarium culmorum |
| Head blight | Bipolaris sorokiniana Cochliobolus sativus [teleomorph] Gibberella zeae [teleomorph] |
| Leaf blotch and crown rot (Helminthosporium leaf blotch) | Drechslera avenacea Helminthosporium avenaceum Helminthosporium avenae Pyrenophora avenae [teleomorph] |
| Powdery mildew | Erysiphe graminis f. sp. avenae E. graminis Oidium monilioides [anamorph] |
| Red leather disease | Spermospora avenae [anamorph] |
| Rhizoctonia root rot | Rhizoctonia solani Thanatephorus cucumeris [teleomorph] |
| Root rot | Bipolaris sorokiniana Cochliobolus sativus [teleomorph] |
| Rust, crown | Puccinia coronata |
| Rust, stem | Puccinia graminis |
| Seedling blight | Bipolaris sorokiniana Cochliobolus sativus [teleomorph] Drechslera avenae Fusarium culmorum Pythium spp. Rhizoctonia solani |
| Sharp eyespot | Rhizoctonia cerealis Ceratobasidium cereale [teleomorph] |
| Smut, covered | Ustilago segetum U. kolleri |
| Smut, loose | Ustilago avenae |
| Snow mold, pink (Fusarium patch) | Microdochium nivale Fusarium nivale Monographella nivalis [teleomorph] |
| Snow mold, speckled or gray (Typhula blight) | T. idahoensis T. incarnata T. ishikariensis |
| Speckled blotch (Septoria blight) | Stagonospora avenae Septoria avenae Phaeosphaeria avenaria [teleomorph] |
| Take-all (white head) | Gaeumannomyces graminis var. avenae Other G. graminis strains |
| Victoria blight | Bipolaris victoriae Cochliobolus victoriae [teleomorph] |
| Miscellaneous diseases or disorders | |
|---|---|
| Blast | Unfavorable environmental conditions and/or any of several pathogens |
| Gray streak | Manganese deficiency |
| Physiological leaf spot | Genetic predisposition |
| Nematodes, parasitic | |
|---|---|
| Bulb and stem | Ditylenchus dipsaci |
| Cyst, oat or cereal | Heterodera avenae |
| Cyst | Heterodera hordecalis Heterodera latipons Punctodera chalcoensis |
| Dagger, American | Xiphinema americanum |
| Lesion | Pratylenchus spp. Pratylenchus thornei |
| Pin | Pratylenchus spp. |
| Ring | Criconemella spp. Nothocriconemella mutabilis and other spp. |
| Root-knot | Meloidogyne spp. M. chitwoodi M. naasi |
| Sheath | Hemicycliophora spp. |
| Spiral | Helicotylenchus spp. |
| Sting | Belonolaimus longicaudatus |
| Stubby-root | Paratrichodorus minor |
| Stunt | Quinisulcius capitatus Tylenchorhynchus spp. Merlinius spp. |
| Viruses | |
|---|---|
| Oat blue dwarf | Oat blue dwarf virus |
| Oat mosaic | Oat mosaic virus |
| Oat necrotic mottle | Oat necrotic mottle virus |
| Oat red leaf | Barley yellow dwarf virus |