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Diseases of African Violet
(Saintpaulia ionantha Wendl.)

Gary W. Moorman, primary collator (last update 9/21/98)

BACTERIAL DISEASES

Bacterial blight

Erwinia chrysanthemi Burkholder, McFadden & Dimock

Crown gall

Agrobacterium tumefaciens (Smith & Townsend) Conn

FUNGAL DISEASES

Crown rot

Sclerotium rolfsii Sacc.

Cylindrocarpon root rot

Cylindrocarpon destructans (Zinssmeister) Scholten

Fusarium root rot

Fusarium solani (Mart.) Sacc.

Gray mold

Botrytis cinerea Pers. ex Fr.

Leaf spot

Alternaria sp. Nees, nom. cons.

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

Phytophthora root and crown rot

Phytophthora nicotianae Breda de Haan var. parasitica
     (Dast.) Waterh.

Phytophthora nicotianae Dastur var. nicotianae (Breda de
     Haan) Tucker

Phytophthora cryptogea Peth. & Laff.

Powdery mildew

Oidium sp. Link, nom. cons.

Pythium root rot

Pythium sp. Pringsh., nom. cons.

Rhizoctonia root and crown rot

Rhizoctonia sp. D.C.

VIRUS DISEASES

Leaf etch

Impatiens necrotic spot virus

Mosaic

Anemone mosaic virus

NEMATODES, PARASITIC

Foliar nematode

Aphelenchoides fragariae (Ritzema Bos) Christie

Aphelenchoides ritzemabosi (Schwartz) Steiner & Buhrer

Nematodes

Criconema sp. Hofmänner & Menzel

Helicotylenchus sp. Steiner

Pratylenchus pratensis Filipjev

Paratylenchus projectus Micoletzky

Rotylenchus brachyurus Filipjev

Scutellonema brachyurum Andrassy

Tylenchorynchus sp. Cobb

Root knot

Meloidogyne arenaria (Neal) Chitwood

Meloidogyne hapla Chitwood

Meloidogyne javanica (Treub) Chitwood

Meloidogyne incognita (Kofoid & White) Chitwood

MISCELLANEOUS DISEASES AND DISORDERS

Marginal leaf burn

Overfertilization

Ring spot

Irrigation water temperature much above or below leaf temperature applied to the leaf surface