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Diseases of Geranium (Pelargonium)

Pelargonium × domesticum Bailey
     (regal geranium or Lady Washington or
     Martha Washington geranium; interspecific hybrids)
Pelargonium × hortorum Bailey
     (florists' or zonal geranium; interspecific hybrids)
Pelargonium graveolens L'Her. ex Aiton
     (scented geranium)
Pelargonium peltatum (L.) L'Her. ex Aiton
     (ivy geranium)

Gary W. Moorman, primary collator (last update 10/1/98)

BACTERIAL DISEASES

Bacterial blight

Xanthomonas campestris pv. pelargonii (Brown) Dye

Bacterial fasciation

Rhodococcus fascians (Tilford) Goodfellow

(= Corynebacterium fascians (Tilford) Dows.)

Bacterial leaf spot

Acidovorax sp.

Pseudomonas cichorii (Swingle) Stapp

Pseudomonas syringae van Hall

Crown gall

Agrobacterium tumefaciens (Smith & Townsend) Conn

Southern wilt

Pseudomonas solanacearum E. F. Sm.

FUNGAL DISEASES

Armillaria root rot

Armillaria mellea (Vahl.: Fr.) P. Kumm.

Black root rot

Thielaviopsis basicola (Berk. & Broome) Ferraris

Blackleg (cutting rot)

Pythium sp.

Botryosphaeria stem rot

Botryosphaeria ribis Gross. & Duggar

Botrytis blight

Botrytis cinerea Pers. ex Fr.

Cottony stem rot

Sclerotinia sclerotiorum (Lib.) deBary

Damping-off

Pythium sp.

Rhizoctonia sp.

Downy mildew

Peronospora conglomerata Fuckel

Fusarium cutting rot

Fusarium sp.

Glomerella stem rot

Glomerella cingulata (Stoneman) Spauld. & H. Schrenk

Leaf mold

Aspergillus fischerianus R. A. Samson & W. Gams

Diaporthe rudis (Fr.:Fr.) Nitschke
     (= D. meduseae Nitschke)

Botryosporium pulchrum Corda

Leaf spot

Alternaria alternata (Fr.:Fr.) Keissler
     (= Alternaria tenuis Neergaard)

Cercospora brunkii Ell. & Gall.

Bipolaris setariae (Sawada) Shoemaker
     (teleomorph: Cochliobolus setariae (Ito & Kuribayashi)
     Drechs. ex Dastur.)

Bipolaris maydis (Nisikado & Miyake) Shoemaker
     (teleomorph: Cochliobolus heterostrophus (Drechs.)
     Drechs.

Ascochyta sp.

Discohainesia oenotherae (Cooke. & Ellis) Nannf.

Pleosphaerulina sp.

Colletotrichum gloeosporiodes (Penz.) Penz. & Sacc.
     (teleomorph: Glomerella cingulata (Stoneman) Spauld. &
     H. Schrenk)

Phyllosticta sp.

Cylindrocladium scoparium Morg.
     (teleomorph: Calonectria kyotensis Terashita)

Phytophthora root rot

Phytophthora sp.

Powdery mildew

Erysiphe communis (Wallr.) Link

Pythium root rot

Pythium sp.

Rhizoctonia root and crown rot

Rhizoctonia solani Kühn (teleomorph: Thanatephorus cucumeris (A. B. Frank) Donk)

Rust

Puccinia pelargonii-zonalis Doidge

Verticillium wilt

Verticillium albo-atrum Reinke & Berthier

Verticillium dahliae Kleb.

VIRAL DISEASES

Leaf cupping and curling

Beet curly top geminivirus

Mosaic

Arabis mosaic virus

Cucumber mosaic virus

Tobacco mosaic virus

Impatiens necrotic spot virus

Tobacco rattle virus

Pelargonium flower break

Pelargonium flower break virus

Pelargonium line pattern

Pelargonium line pattern virus

Pelargonium ring pattern

Pelargonium ring pattern virus

Pelargonium ringspot

Tomato ringspot virus

Tobacco ringspot virus

Pelargonium zonate spot

Pelargonium zonate spot virus

Vein clearing

Pelargonium vein clearing virus

NEMATODES, PARASITIC

Foliar nematode

Aphelenchoides coffeae Zimmerman

Aphelenchoides fragariae (Ritzema Bos) Christie

Nematodes

Pratylenchus pratensis Filipjev

Tylenchorhynchus dubius Cobb

Xiphinema americanum Cobb

Root knot

Meloidogyne arenaria (Neal) Chitwood

Meloidogyne hapla Chitwood

Meloidogyne incognita (Kofold & White) Chitwood

MISCELLANEOUS DISEASES AND DISORDERS

Edema (Oedema)

Moisture imbalance in plants when soil is warm and wet while the air is cool and wet

Leaf bleaching

Heat stress

Yellow net vein

Cause unknown