Diseases of Common House or Florist's Hydrangea
(Hydrangea macrophylla) (Thunb.) Ser.

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

BACTERIAL DISEASES

Bacterial blight

Pseudomonas solanacearum E. F. Sm.

Bacterial leaf spot

Pseudomonas cichorii (Swingle) Stapp.

FUNGAL DISEASES

Bud and flower blight

Botrytis cinerea Pers.: Fr.

Interveinal chlorosis

Lack of iron uptake due to alkaline soils

Fungal leaf spots

Cercospora hydrangeae Ellis & Everh. in Atk.

Corynespora cassicola (Berk. & M. A. Curtis) C. T. Wei

Phyllosticta hydrangeae Ellis & Everth.

Septoria hydrangeae Bizz.

Powdery mildew

Erysiphe polygoni DC.

Root rot

Pythium spp.

Rust

Pucciniastrum hydrangeae (Magn.) Arth.

Southern blight

Sclerotium rolfsii Sacc.

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

VIRAL DISEASES

Phyllody

Hydrangea ringspot virus

Ringspots

Hydrangea ringspot virus

Tobacco ringspot virus

Tomato spotted wilt virus

Tomato ringspot virus