This article is a list of diseases of lettuce (Lactuca sativa).
Bacterial diseases
Bacterial diseasesBacterial leaf spot and head rot Xanthomonas campestris pv. vitiansBacterial soft rotErwinia carotovora Pseudomonas marginalisCorky root Rhizomonas spp. R. suberifaciensVarnish spot Pseudomonas cichorii
Fungal diseases
Fungal diseasesAlternaria leaf spot Alternaria sonchiAnthracnose Microdochium panattonianum Marssonina panattonianaBottom rot Rhizoctonia solani Thanatephorus cucumeris [teleomorph] Cercospora leaf spot Cercospora longissimaDamping-off, Pythium Pythium spp. Pythium ultimumDamping-off, Rhizoctonia Rhizoctonia solaniDowny mildew Bremia lactucae Plasmopara lactucae-radicisDrop (Sclerotinia rot) Sclerotinia sclerotiorum Sclerotinia minorGray mold Botrytis cinerea Botryotinia fuckeliana [teleomorph] Phymatotrichum root rot (cotton root rot) Phymatotrichopsis omnivora Phymatotrichum omnivorumPowdery mildew Erysiphe cichoracearumRust Puccinia dioicae Puccinia extensicola var. hieraciataSeptoria leaf spot Septoria lactucaeSouthern blight Sclerotium rolfsii Athelia rolfsii [teleomorph] Stemphylium leaf spot Stemphylium botryosum Pleospora tarda [teleomorph] Wilt and leaf blight Pythium tracheiphilum
Miscellaneous diseases and disorders
Miscellaneous diseases and disordersBrown stain Physiological, excess CO2 Russet spotting Physiological, excess ethylene Tipburn Physiological, Ca** deficiency and high temperature
Nematodes, parasitic
Nematodes, parasiticFalse root knot Nacobbus aberransLesion Pratylenchus spp. Needle Longidorus spp. Root-knot Meloidogyne spp. Spiral Rotylenchus robustusStunt Melinius brevidens Tylenchorhynchus spp.
Phytoplasma, Viral and viroid diseases
Viral and viroid diseasesBig vein Lettuce big vein virus Calico Alfalfa mosaic virus Tobacco ringspot virus Lettuce diebackInternal rib necrosis Lettuce mosaic virus Mosaic Lettuce mosaic virus Bidens mosaic virus Cucumber mosaic virus Turnip 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 virusStunt Beet yellow stunt virus Virescence Aster yellows phytoplasma Beet leafhopper-transmitted virescence phytoplasma Wilt Broadbean wilt virus Tomato spotted wilt virus Yellow spot Tobacco rattle virus Yellows Beet western yellows virus Other Sowthistle yellow vein virus
References Common Names of Diseases, The American Phytopathological Society