Diseases of Hemp
(Cannabis sativa L.)

J. M. McPartland, primary collator (last update 4/8/03)

BACTERIAL DISEASES

Bacterial blight

Pseudomonas syringae pv. cannabina (Sutic & Dowson) Young et al.

Crown gall

Agrobacterium tumefaciens (Smith & Townsend) Conn

Striatura ulcerosa

Pseudomonas syringae pv. mori (Boyer & Lambert) Young et al.

Xanthomonas leaf spot

Xanthomonas campestris pv. cannabis Severin

FUNGAL DISEASES

Anthracnose

Colletotrichum coccodes (Wallroth) Hughes

= C. atramentarium (Berk. & Broome) Tauberhaus

= C. dematium (Pers.:Fr.) Grove

Black dot disease

Epicoccum nigrum Link

= Epicoccum purpurascens Ehrenb.

Black mildew

Schiffnerula cannabis McPartland & Hughes

Brown blight

Alternaria alternata (Fr.:Fr.) Keissl.

= A. tenuis Nees

Brown leaf spot and stem canker

Ascochyta spp.

A. prasadii Shukia & Pathak

Phoma spp.

    Didymella spp. [teleomorph]

P. exigua Desmaz.

P. glomerata (Corda) Wollenweb. & Hochapfel

P. herbarum Westendorp

Charcoal rot

Macrophomina phaseolina (Tassi) Goidanich

Cladosporium stem canker

Cladosporium cladosporioides (Fresen.) De Vries.

C. herbarum (Pers.:Fr.) Link

    Mycosphaerella tassiana (De Not.) Johan. [teleomorph]

Curvularia leaf spot

Curvularia cymbopogonis (C. W. Dodge) Groves

    & Skolko

C. lunata (Wakker) Boedijn

    Cochliobolus lunatus Nelson & Haasis [teleomorph]

Cylindrosporium blight

Cylindrosporium spp.

C. cannabinum Ibrahimov

Damping-off

Botrytis cinerea Pers.:Fr.

    Botryotinia fuckeliana (de Bary) Whetzel [teleomorph]

Fusarium oxysporum Schlechtend.:Fr.

F. solani (Mart.) Sacc.

    Nectria haematococca Berk. & Broome [teleomorph]

Macrophomina phaseolina (Tassi) Goidanich

Pythium aphanidermatum (Edson) Fitzp.

P. debaryanum auct. non Hesse

P. ultimum Trow

Rhizoctonia solani Kühn

    Thanatophorus cucumeris (A. B. Frank) Donk

    [teleomorph]

= Pellicularia filamentosa (Pat) D. P. Rogers

Downy mildew

Pseudoperonospora cannabina (Otth) Curzi

P. humuli (Miyabe & Takah.) G. W. Wils.

Fusarium foot rot and root rot

Fusarium solani (Mart.) Sacc.

Fusarium stem canker

Fusarium sulphureum Schlechtend.

    Gibberella cyanogena (Desmaz.) Sacc. [teleomorph]

= G. saubinett (Mont.) Sacc.

Fusarium wilt

Fusarium oxysporum Schlechtend.:Fr. f. sp. cannabis

    Noviello & W. C. Snyder

F. oxysporum Schlechtend.Fr. f. sp. vasinfectum (Atk.)

    W. C. Snyder & H. N. Hans.

Gray mold

Botrytis cinerea Pers.:Fr.

Hemp canker

Sclerotinia sclerotiorum (Lib.) de Bary

Leptosphaeria blight

Leptosphaeria cannabina Ferraris & Massa

L. woroninii Docea & Negru

L. acuta (Fuckel) P. Karst.

Olive leaf spot

Cercospora cannabis K. Hara & Fukui

Pseudocercospora cannabina (Wakef.) Deighton

Ophiobolus stem canker

Ophiobolus cannabinus Pass.

O. anguillidus (Cooke in Cooke & Ellis) Sacc.

Phoma stem canker

Phoma herbarum Westendorp.

P. exigua Desmaz

Phomopsis stem canker

Phomopsis cannabina Curzi

P. achilleae (Sacc.) Hohn.

    Diaporthe arctii (Lasch) Nitschke var. achilleae

    (Auersw.) Wehmeyer [teleomorph]

Phymatotrichum root rot (Cotton root rot)

Phymatotrichopsis omnivora (Duggar) Hennebert

= Phymatotrichum omnivorum Duggar

Pink rot

Trichothecium roseum (Pers.:Fr.) Link

= Cephalothecium roseum Corda

Powdery mildew

Leveillula taurica (Lév.) Arnaud.

    Oidiopsis taurica Salmon [anamorph]

Sphaerotheca macularis (Wallroth:Fr.) Lind

= S. humuli (DC.) Burrill

    Oidium sp. [anamorph]

Red boot

Melanospora cannabis Behrens (secondary on hemp canker)

Rhizoctonia soreshin and root rot

Rhizoctonia solani Kühn

Rust

Aecidium cannabis Szembel

Uredo kriegeriana Syd. & P. Syd.

Uromyces inconspicuus Otth

Southern blight (Sclerotium root and stem rot)

Sclerotium rolfsii Sacc.

    Athelia rolfsii (Curzi) Tu & Kimbrough [teleomorph]

Stemphylium leaf and stem spot

Stemphylium botryosum Wallroth

    Pleospora tarda E. Simmons [teleomorph]

S. cannabinum (Bachtin & Gutner) Dobrozrakova et al.

Tar spot

Phyllachora cannabidis (P. Henn.)

Tropical rot

Lasiodiplodia theobromae (Pat.) Griffon & Maubl.

= Botryodiplodia theobromae Pat.

Twig blight

Dendrophoma marconii Cav.

    Botryosphaeria marconii V. Charles & Jenkins

    [teleomorph]

Verticillium wilt

Verticillium albo-atrum Reinke & Berthier

V. dahliae Kleb.

White leaf spot

Phomopsis ganjae McPartland

Yellow leaf spot

Septoria cannabis (Lasch) Sacc.

S. cannabina Peck

NEMATODE DISEASES

Cyst

Heterodera humuli Filipjev

H. schachtii Schmidt

Needle

Paralongidorus maximus (Butschli) Siddiqi

= Longidorus maximus (Butschli) Th. & Swang.

Root-knot

Meloidogyne incognita (Kofoid &White) Chitwood

M. javanica (Treub) Chitwood

Stem

Ditylenchus dipsaci (Kühn) Filipjev

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 ?, Hemp mosaic virus

Hemp streak

genus ?, Hemp streak virus

PHYTOPLASMAL DISEASES

Witches' broom

DISEASES CAUSED BY PARASITIC PLANTS

Broomrape

Orobanche ramosa L.

Dodder

Cuscuta europaea L.

C. pentagona Eng.

MISCELLANEOUS DISEASES OR DISORDERS

Fasciation

Cause undetermined

Grey fleck

Magnesium deficiency

Tipburn & leaf margin necrosis

Potassium deficiency