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Diseases of Cattleya Lindl. spp.

G. W. Simone, primary collator (last update 11/08/00)

BACTERIAL DISEASES

Bacterial soft rot

Erwinia carotovora subsp. carotovora (Jones 1901) Bergey
    et al. 1923

= Pectobacterium carotovorum (Jones 1901) Waldee 1945

Brown spot

Acidovorax avenae subsp. cattleya (Pavarino 1911) Willems
    et al. 1992

= Pseudomonas cattleya (Pav.) Sav.

FUNGAL DISEASES

Anthracnose

Colletotrichum crassipes (Speg.) Arx

Glomerella cingulata (Stoneman) Spauld. & H. Schrenk

    Colletotrichum gloeosporioides (Penz.) Penz. & Sacc
    [anamorph]

Gloeosporium cattleyae Henn.

Basal rot

Sclerotium rolfsii Sacc.

Black rot

Phytophthora cactorum (Lebert & Cohn) J. Schroet.

Pythium ultimum Trow

Bloom shoot necrosis

Alternaria sp.

Dieback

Botryodiplodia oncidii (Henn.) Petr. & Syd.

Flyspeck

Schizothyrium perexiguum (Roberge) Hoehn.

Gray mold

Botrytis cinerea Pers.:Fr.

    Botryotinia fuckeliana (deBary) Whetzel [teleomorph]

Leaf necrosis

Curvularia sp.

Leaf rot

Pythium splendens H. Braun

Leaf spot

Alternaria sp.

Cercospora angraeci Feuillebois & Roum.

C. odontoglossi Prill. & Delacr.

Chaetodiplodia sp.

Coniothyrium sp.

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

Diplodia laelio-cattleyae Sibilia

D. paraphysaria Sacc.

Fulvia fulva (Cooke) Cif.

Lasiodiplodia theobromae (Pat.) Griffon & Maubl.

Leptothyrium sp.

Phoma oncidii-sphacelati Tassi

Phyllosticta capitalensis Henn.

Pseudocercospora sp.

Septoria selenophomoides Cash & A.M. Watson

Pseudobulb and root rot

Fusarium oxysporum Schlechtend.:Fr. f. sp. cattleyae V. Foster

Root and stem rot

Rhizoctonia solani Kühn

Root rot

Phytophthora palmivora (E.J. Butler) E.J. Butler

Rust

Sphenospora kevorkianii Linder

    Uredo nigropuncta Henn. [anamorph]

U. behnickiana Henn.

VIRAL and VIROID DISEASES

Flower break

genus Tobamovirus, Odontoglossum ringspot virus (ORSV)

Mosaic

genus Potexvirus, Cymbidium mosaic virus (CymMV)

genus Tobamovirus, Odontoglossum ringspot virus (ORSV)

White cell necrosis

genus Potexvirus, Cymbidium mosaic virus (CymMV)

MISCELLANEOUS DISEASES and DISORDERS

Algal spot

Cephaleuros virescens Kunze

Blind leads

Suboptimal light levels

Chlorotic leaf mottle

Iron deficiency

Dry sepal

Ethylene toxicity (> 2 – 50 ppb)

Edema

Edema

Mesophyll collapse

Low temperature exposure

No flowers

Extended low light periods on short-day plants

Pimpling

High light conditions

Sepal wilt

High soluble nitrogen or high levels of air-pollutants

Shriveling

Senescence of pseudobulbs

Slime molds

Fuligo spp.

Snow mold

Ptychogaster sp. (saprophyte)

Sooty blotch

Gloeodes pomigena (Schwein.) Colby

Sooty mold

Capnodium spp.

Sunburn

Sudden high light

Tip necrosis

Calcium deficiency

White streaking

Genetic flower break