This is a list of diseases of hemp (Cannabis sativa).
| Bacterial diseases | |
|---|---|
| Bacterial blight | Pseudomonas cannabina |
| Crown gall | Agrobacterium tumefaciens |
| Striatura ulcerosa | Pseudomonas amygdali pv. mori |
| Xanthomonas leaf spot | Xanthomonas campestris pv. cannabis |
| Fungal diseases | |
|---|---|
| Anthracnose | Colletotrichum coccodes Colletotrichum atramentarium |
| Black dot disease | Epicoccum nigrum Epicoccum purpurascens |
| Black mildew | Schiffnerula cannabis |
| Brown blight | Alternaria alternata Alternaria tenuis |
| Brown leaf spot and stem canker | Ascochyta spp. Ascochyta prasadii Phoma spp. Didymella spp. [teleomorph] Phoma exigua Phoma glomerata Phoma herbarum |
| Charcoal rot | Macrophomina phaseolina |
| Cladosporium stem canker | Cladosporium cladosporioides Cladosporium herbarum Mycosphaerella tassiana [teleomorph] |
| Curvularia leaf spot | Curvularia cymbopogonis Curvularia lunata Cochliobolus lunatus [teleomorph] |
| Cylindrosporium blight | Cylindrosporium spp. Cylindrosporium cannabinum |
| Damping-off | Botrytis cinerea Botryotinia fuckeliana [teleomorph] Fusarium oxysporum Fusarium solani Nectria haematococca [teleomorph] Macrophomina phaseolina Pythium aphanidermatum Pythium debaryanum Pythium ultimum Rhizoctonia solani Thanatephorus cucumeris [teleomorph] Pellicularia filamentosa |
| Downy mildew | Pseudoperonospora cannabina Pseudoperonospora humuli |
| Fusarium foot rot and root rot | Fusarium solani |
| Fusarium stem canker | Fusarium sulphureum Gibberella cyanogena [teleomorph] Gibberella saubinetii |
| Fusarium wilt | Fusarium oxysporum f.sp. cannabis Fusarium oxysporum f.sp. vasinfectum |
| Gray mold | Botrytis cinerea |
| Hemp canker | Sclerotinia sclerotiorum |
| Leptosphaeria blight | Leptosphaeria cannabina Leptosphaeria woroninii Leptosphaeria acuta |
| Olive leaf spot | Cercospora cannabis Pseudocercospora cannabina |
| Ophiobolus stem canker | Ophiobolus cannabinus Ophiobolus anguillides |
| Phoma stem canker | Phoma herbarum Phoma exigua |
| Phomopsis stem canker | Phomopsis cannabina Phomopsis achilleae Diaporthe arctii var. achilleae [teleomorph] |
| Phymatotrichum root rot Cotton root rot | Phymatotrichopsis omnivora Phymatotrichum omnivorum |
| Pink rot | Trichothecium roseum Cephalothecium roseum |
| (of Cannabis) | Leveillula taurica Oidiopsis taurica [anamorph] Podosphaera macularis Sphaerotheca humuli Sphaerotheca macularis Golovinomyces cichoracearum sensu lato |
| Red boot | Melanospora cannabis (secondary on hemp canker) |
| Rhizoctonia soreshin and root rot | Rhizoctonia solani |
| Rust | Aecidium cannabis Uredo kriegeriana Uromyces inconspicuus |
| Southern blight Sclerotium root and stem rot | Sclerotium rolfsii Athelia rolfsii [teleomorph] |
| Stemphylium leaf and stem spot | Stemphylium botryosum Pleospora tarda [teleomorph] Stemphylium cannabinum |
| Tar spot | Phyllachora cannabis |
| Tropical rot | Lasiodiplodia theobromae Botryodiplodia theobromae |
| Twig blight | Dendrophoma marconii Botryosphaeria marconii [teleomorph] |
| Verticillium wilt | Verticillium albo-atrum Verticillium dahliae |
| White leaf spot | Phomopsis ganjae |
| Yellow leaf spot | Septoria cannabis Septoria cannabina |
| Nematodes, parasitic | |
|---|---|
| Cyst | Heterodera humuli Heterodera schachtii |
| Needle | Paralongidorus maximus Longidorus maximus |
| Root-knot | Meloidogyne incognita Meloidogyne javanica |
| Stem | Ditylenchus dipsaci |
| Viral diseases | |
|---|---|
| Alfalfa mosaic & Lucerne mosaic | genus Alfamovirus, Alfalfa mosaic virus (AMV) |
| Arabis mosaic | genus Nepovirus, Arabis mosaic virus (ArMV) |
| Cucumber mosaic | genus Cucumovirus, Cucumber mosaic virus (CMV) |
| Hemp mosaic | genus ?Tobamovirus |
| Hemp streak | |
| Miscellaneous diseases and disorders | |
|---|---|
| Fasciation | Cause undetermined |
| Grey fleck | Magnesium deficiency |
| Tipburn & leaf margin necrosis | Potassium deficiency |