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Diseases of Garden Dahlia
(Dahlia sp.)

S. T. Nameth, primary collator (last update 9/22/98)

BACTERIAL DISEASES

Bacterial wilt

Pseudomonas solanacearum E. F. Sm.

Crown gall

Agrobacterium tumefaciens (Smith & Town.) Conn.

FUNGAL DISEASES

Flower blight

Botrytis cinerea Pers.: Fr.

Leaf spot

Alternaria alternata (Fr.:Fr.) Keissl

Powdery mildew

Erysiphe cichoracearum DC.

Erysiphe communis (Wallr.) Link

Erysiphe polygoni DC.

Soft rot

Erwinia carotovora subsp. carotovora (Jones) Bergy et. al.

Southern blight

Sclerotium rolfsii Sacc.

(teleomorph: Athelia rolfsii (Curzi) Tu & Kimbrough)

Smut

Entyloma dahliae Syd. & P. Syn.

Stem and tuber rot

Rhizoctonia solani Kühn

(teleomorph: Thanatephorus cucumeris (A. B. Frank) Donk)

Cottony stem rot

Sclerotinia sclerotiorum (Lib.) de Bary

Vascular wilt

Fusarium oxysporum Schlechtend.: Fr.

Verticillium albo-atrum Ranch and Berth.

VIRAL DISEASES

Mosaic

Cucumber mosaic virus

Dahlia mosaic virus

Tomato spotted wilt virus

Ringspot

Impatiens necrotic spot virus