The following is a list of diseases in citrus plants.
Bacterial diseases
| Bacterial diseases | |
|---|---|
| Bacterial spot | Xanthomonas euvesicatoria pv. citrumelo | 
| Black pit (fruit) | Pseudomonas syringae | 
| Blast | Pseudomonas syringae | 
| Citrus canker | Xanthomonas citri pv. citri | 
| Citrus variegated chlorosis | Xylella fastidiosa | 
| Huanglongbing = citrus greening | Candidatus Liberibacter asiaticus Candidatus L. africanus | 
Fungal diseases
Nematodes, parasitic
| Nematodes, parasitic | |
|---|---|
| Citrus slump nematode | |
| Dagger nematode | Xiphinema spp. | 
| Lesion nematode | Pratylenchus spp.  | 
| Needle nematode | Longidorus spp. | 
| Root-knot nematode | Meloidogyne spp. | 
| Sheath nematode | |
| Slow decline (citrus nematode) | |
| Spreading decline (burrowing nematode) | |
| Sting nematode | |
| Stubby-root nematode | Paratrichodorus spp. | 
| Stunt nematode | Tylenchorhynchus spp. | 
Viral diseases
| Viral diseases | |
|---|---|
| Citrus mosaic | Satsuma dwarf-related virus | 
| Bud union crease | Virus for some combinations, otherwise genetic or unknown | 
| Citrus leaf rugose | genus Ilarvirus, Citrus leaf rugose virus (CLRV) | 
| Citrus yellow mosaic | genus Badnavirus | 
| Crinkly leaf | Crinkly leaf virus (strain of Citrus variegation virus) | 
| Infectious variegation | genus Ilarvirus, Citrus variegation virus (CVV) | 
| Navel infectious mottling | Satsuma dwarf-related virus | 
| Psorosis | Citrus psorosis virus (CPsV) | 
| Satsuma dwarf | Satsuma dwarf virus (SDV) | 
| Tatter leaf = citrange stunt | genus Capillovirus, Citrus tatter leaf virus (probably a closely related strain of Apple stem grooving virus rather than a distinct virus | 
| Tristeza = decline and stem pitting, seedling yellows | genus Closterovirus, Citrus tristeza virus (CTV) | 
| Citrus Leprosis Virus type I & II | |
Viroids and graft-transmissible pathogens [GTP]
| Viroids and graft-transmissible pathogens [GTP] | |
|---|---|
| Algerian navel orange virus | GTP | 
| Blight = young tree decline, rough lemon decline | GTP | 
| Blind pocket | GTP | 
| Cachexia | Citrus cachexia viroid (Hostuviroid) | 
| Chlorotic dwarf | White-fly transmitted GTP | 
| Citrus dwarfing | Various viroids | 
| Citrus vein enation (CVEV) = woody gall | GTP (possible luteovirus) | 
| Citrus yellow mottle | GTP | 
| Citrus yellow ringspot | GTP | 
| Concave gum | GTP | 
| Cristacortis | GTP | 
| Exocortis | Citrus exocortis viroid (CEVd) Pospiviroidae | 
| Fatal yellows | GTP | 
| Gummy bark | GTP, possible viroid | 
| Gum pocket and gummy pittings | GTP, possible viroid | 
| Impietratura | GTP | 
| Indian citrus ringspot | GTP | 
| Leaf curl | GTP | 
| Leathery leaf | GTP | 
| Leprosis | GTP associated with Brevipalpus spp. mites | 
| Measles | GTP | 
| Milam stem-pitting | GTP | 
| Multiple sprouting disease | GTP | 
| Nagami kumquat disease | GTP | 
| Ringspot diseases | Various GTPs | 
| Xyloporosis = cachexia | Citrus cachexia viroid (Hostuviroid) | 
| Yellow vein | GTP | 
| Yellow vein clearing of lemon | GTP | 
Phytoplasmal and spiroplasmal diseases
| Phytoplasmal and spiroplasmal diseases | |
|---|---|
| Australian citrus dieback | Unknown procaryote? | 
| Stubborn | Spiroplasma citri (spread by leafhoppers) | 
| Witches’ broom of lime | Phytoplasma | 
Miscellaneous diseases and disorders
| Miscellaneous diseases and disorders | |
|---|---|
| Algal disease (algal spot) | Cephaleuros virescens | 
| Amachamiento | Unknown | 
| Blossom-end clearing | Physiological | 
| Chilling injury | Cold temperatures | 
| Citrus blight | Unknown - pathogen suspected | 
| Creasing | Nutritional (?) | 
| Crinkle scurf | Genetic | 
| Granulation | Physiological | 
| Lemon sieve-tube necrosis | Unknown, but hereditary | 
| Lime blotch = wood pocket | Inherited chimeral agent | 
| Membranous stain | Cold temperatures | 
| Mesophyll collapse | Unknown | 
| Oleocellosis | Physiological | 
| Postharvest pitting | Physiological | 
| Puffing | Physiological | 
| Rind breakdown | Physiological | 
| Rind staining | Physiological | 
| Rind stipple of grapefruit | Environmental | 
| Rumple of lemon fruit | Unknown | 
| Shell bark complex | Unknown - (viroid?) | 
| Sooty mold (superficial, not pathogenic) | Capnodium C. citricola | 
| Stem-end rind breakdown | Physiological | 
| Stylar-end breakdown of Tahiti lime | Physiological | 
| Stylar-end rind breakdown | Physiological | 
| Stylar-end rot | Physiological | 
| Sunburn | Excessive heat and light | 
| Tangerine dieback | Unknown | 
| Water spot | Physiological | 
| Woody galls on stems | Bruchophagus fellis (Citrus Gall Wasp) | 
| Zebra skin | Physiological | 
References
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