The following is a list of diseases in citrus plants.
| Bacterial diseases | |
|---|---|
| Bacterial spot | Xanthomonas euvesicatoria pv. citrumelo |
| Black pit (fruit) | Pseudomonas syringae |
| Blast | Pseudomonas syringae |
| Xanthomonas citri pv. citri | |
| Citrus variegated chlorosis | Xylella fastidiosa |
| Huanglongbing = citrus greening | Candidatus Liberibacter asiaticus Candidatus L. africanus |
| Nematodes, parasitic | |
|---|---|
| Citrus slump nematode | Pratylenchus coffeae |
| Dagger nematode | Xiphinema spp. |
| Lesion nematode | Pratylenchus spp. Pratylenchus brachyurus Pratylenchus coffeae Pratylenchus vulnus |
| Needle nematode | Longidorus spp. |
| Root-knot nematode | Meloidogyne spp. |
| Sheath nematode | Hemicycliophora spp. Hemicycliophora arenaria |
| Slow decline (citrus nematode) | Tylenchulus semipenetrans |
| Spreading decline (burrowing nematode) | Radopholus similis |
| Sting nematode | Belonolaimus longicaudatus |
| Stubby-root nematode | Paratrichodorus spp. |
| Stunt nematode | Tylenchorhynchus spp. |
| Viral diseases | |
|---|---|
| Citrus mosaic | |
| 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 | |
| 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] | |
|---|---|
| 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 | |
| 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 | |
|---|---|
| Australian citrus dieback | Unknown procaryote? |
| Spiroplasma citri (spread by leafhoppers) | |
| Witches’ broom of lime | Phytoplasma |
| 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 Capnodium sp. |
| 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 |