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Diseases of Chrysanthemum
(Dendrathema × grandiflorum Kitam. = Chrysanthemum × morifolium Ramat.)

Arthur H. McCain, primary collator

BACTERIAL DISEASES

Bacterial blight

Erwinia chrysanthemi Burkholder et al.

Bacterial leaf spot

Pseudomonas cichorii (Swingle) Stapp

Crown gall

Agrobacterium tumefaciens (Smith & Townsend) Conn

Fasciation

Rhodococcus fascians (Tilford) Goodfellow

= Corynebacterium fascians (Tilford) Dowson

Stem necrosis

Pseudomonas cichorii (Swingle) Stapp

FUNGAL DISEASES

Alternaria leaf spot

Alternaria sp.

Bipolaris leaf spot

Bipolaris setaria (Sawada) Shoemaker

    Cochliobolus setariae (Ito & Kuribayashi in Ito) Drechs. ex Dastur [teleomorph]

Cercospora leaf spot

Cercospora chrysanthemi Heald & F. A. Wolf

Charcoal stem rot

Macrophomina phaseolina (Tassi) Goidanich

Cylindrosporium leaf

Cylindrosporium chrysanthemi Ellis & spot Dearn.

Fusarium wilt

Fusarium oxysporum Schlechtend.:Fr. f. sp. chrysanthemi G. M. Armstrong et al.

F. oxysporum Schlechtend.:Fr. f. sp. tracheiphilum

    (E. F. Sm.) W. C. Snyder & H. N. Hans. (race 1)

Gray mold

Botrytiscinerea Pers.:Fr.

    Botryotinia fuckeliana (de Bary) Whetzel [teleomorph]

Itersonilia petal blight

Itersonilia perplexans Derx

Phymatotrichum root rot (cotton root rot)

Phymatotrichiopsis omnivora (Duggar) Hennebert

= Phymatotrichum omnivorum Duggar

Powdery mildew

Erysiphe cichoracearum DC.

Pythium root rot

Pythium spp.

P. ultimum Trow

Ray blight

Didymella ligulicola (K. Baker et al.) Arx in E. Müller & Arx

    Phoma chrysanthemi Voglino [anamorph]

= Ascochyta chrysanthemi F. Stevens

Ray speck

Stemphylium lycopersici (Enjoji) W. Yamamoto

= S. floridanum Hannon & Weber

Rhizoctonia stem rot

Rhizoctonia solani Kühn

    Thanatephora cucumeris (A. B. Frank) Donk [teleomorph]

Root rot

Phoma chrysanthemicola Hollos

Rust

Puccinia tanaceti DC.

Septoria leaf spot

Septoria chrysanthemi Halst. in Seym. & Earle

Sclerotinia rot

Sclerotinia sclerotiorum (Lib.) de Bary

Southern blight

Sclerotium rolfsii Sacc.

    Athelia rolfsii (Curzi) Tu & Kimbrough [teleomorph]

Stem rot

Fusarium solani (Mart.) Sacc.

    Nectria haematococca Berk & Broome [teleomorph]

Verticillium wilt

Verticillium albo-atrum Reinke & Berthier

V. dahliae Kleb.

White rust

Puccinia horiana Henn.

NEMATODES, PARASITIC

Bud and leaf

Aphelenchoides ritzemabosi (Schwartz) Steiner & Buhrer

Lesion

Pratylenchus pratensis (de Man) Filipjev

Root-knot

Meloidogyne spp.

VIRAL DISEASES

Aspermy & Chrysanthemum mosaic

genus Cucumovirus, Tomato aspermy virus (TAV)

Spotted wilt

genus Tospovirus, Tomato spotted wilt virus (TSWV)

Chrysanthemum chlorotic mottle

Chrysanthemum chlorotic mottle viroid

Chrysanthemum stunt

Chrysanthemum stunt viroid

PHYTOPLASMAL DISEASES

Aster yellows