This article is a list of diseases of lettuce (Lactuca sativa).
Bacterial diseases
| Bacterial diseases | |
|---|---|
| Bacterial leaf spot and head rot | Xanthomonas campestris pv. vitians |
| Bacterial soft rot | Erwinia carotovora |
| Corky root | Rhizomonas spp. R. suberifaciens |
| Varnish spot | Pseudomonas cichorii |
Fungal diseases
| Fungal diseases | |
|---|---|
| Alternaria leaf spot | |
| Anthracnose | |
| Bottom rot |
Rhizoctonia solani |
| Cercospora leaf spot | |
| Damping-off, Pythium |
Pythium spp. |
| Damping-off, Rhizoctonia | |
| Downy mildew | |
| Drop (Sclerotinia rot) | |
| Gray mold |
Botrytis cinerea |
| Phymatotrichum root rot (cotton root rot) | |
| Powdery mildew | |
| Rust | |
| Septoria leaf spot | |
| Southern blight |
Sclerotium rolfsii |
| Stemphylium leaf spot |
Stemphylium botryosum |
| Wilt and leaf blight | |
Miscellaneous diseases and disorders
| Miscellaneous diseases and disorders | |
|---|---|
| Brown stain | Physiological, excess CO2 |
| Russet spotting | Physiological, excess ethylene |
| Tipburn | Physiological, Ca** deficiency and high temperature |
Nematodes, parasitic
| Nematodes, parasitic | |
|---|---|
| False root knot | |
| Lesion |
Pratylenchus spp. |
| Needle |
Longidorus spp. |
| Root-knot |
Meloidogyne spp. |
| Spiral | |
| Stunt |
Melinius brevidens |
Phytoplasma, Viral and viroid diseases
| Viral and viroid diseases | |
|---|---|
| Big vein | Lettuce big vein virus |
| Calico | Alfalfa mosaic virus |
| Lettuce dieback[1] | Lettuce necrotic stunt virus |
| Internal rib necrosis |
Lettuce mosaic virus |
| Mosaic | Lettuce mosaic virus Bidens mosaic virus |
| Necrotic yellows | Lettuce necrotic yellows virus |
| Ring necrosis | Presumed viral agent (not identified) |
| Rusty brown discoloration | Accentuated by lettuce mosaic virus |
| Speckles | Lettuce speckles virus and beet western yellows virus |
| Stunt | Beet yellow stunt virus |
| Virescence | Aster yellows phytoplasma Beet leafhopper-transmitted virescence phytoplasma |
| Wilt | Broadbean wilt virus |
| Yellow spot | Tobacco rattle virus |
| Yellows | Beet western yellows virus |
| Other | Sowthistle yellow vein virus |
References
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