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Diseases of Cucurbits
(Citrullus spp., Cucumis spp., Cucurbita spp., and others)

R. D. Martyn, M. E. Miller and B. D. Bruton, primary collators (last update 2/19/93)


BACTERIAL DISEASES

Angular leaf spot
Pseudomonas syringae pv. lachrymans (Smith and Bryan) Young et al.
Bacterial fruit blotch/seedling blight
Acidovorax avena subsp. citrulli (Schaad et al.) Willems
    et al.
= Pseudomonas pseudoalcaligenes subsp. citrulli
Bacterial leaf spot
Xanthomonas campestris pv. cucurbitae (Bryan) Dye
Bacterial rind necrosis
Erwinia spp.
Bacterial soft rot
Erwinia carotovora subsp. carotovora (Jones) Bergey et al.
Bacterial wilt
Erwinia tracheiphila (Smith) Bergey et al.
Brown spot
Erwinia ananas Serrano

FUNGAL DISEASES

Alternaria leaf blight
Alternaria cucumerina (Ellis & Everh.) J.A. Elliott
Alternaria leaf spot
Alternaria alternata (Fr.:Fr.) Keissl. f. sp. cucurbitae
Anthracnose (stem, leaf and fruit)
Colletotrichum orbiculare (Berk. & Mont.) Arx
= C. lagenarium (Pass.) Ellis & Halst
(teleomorph: Glomerella lagenarium Stevens)
Belly rot
Rhizoctonia solani Kühn
(teleomorph: Thanatephora cucumeris (A.B. Frank) Donk)
Black root rot
Thielaviopsis basicola (Berk. & Broome) Ferraris
Blue mold rot
Penicillium spp.
P. digitatum (Pers.:Fr.) Sacc.
Cephalosporium root and hypocotyl rot, stem streak and dieback
Acremonium spp.
= Cephalosporium spp.
Cercospora leaf spot
Cercospora citrullina Cooke
Charcoal rot (vine decline and fruit rot)
Macrophomina phaseolina (Tassi) Goidanich
Choanephora fruit rot
Choanephora cucurbitarum (Berk. & Ravenel) Thaxt.
Collapse of melon
Monosporascus eutypoides (Petrak) Arx
= Bitrimonospora indica Sivanesans et al.
Corynespora blight/target spot
Corynespora cassiicola (Berk. & M.A. Curtis) C.T. Wei
Crater rot (fruit)
Myrothecium roridum Tode:Fr.
Crown and foot rot
Fusarium solani (Mart.) Sacc. f. sp. cucurbitae W.C. Snyder
    & H.N. Hans.
(teleomorph: Nectria haematococca Berk. & Broome)
Damping-off
Acremonium spp.
Fusarium spp.
F. equiseti (Corda) Sacc.
(teleomorph: Gibberella intricans Wollenweb.)
Phytophthora sp.
Pythium spp.
Rhizoctonia solani Kühn
Thielaviopsis basicola (Berk. & Broome) Ferraris
Other fungi
Downy mildew
Pseudoperonospora cubensis (Berk. & M.A. Curtis) Rostovzev
Fusarium fruit rot
Fusarium equiseti (Corda) Sacc.
= F. roseum Link f. gibbosum W.C. Snyder & H.N. Hans.
F. graminearum Schwabe
(teleomorph: Gibberella zeae (Schwein.) Petch
F. semitectum Berk. & Ravenel
F. solani (Mart.) Sacc. f. sp. cucurbitae W.C. Snyder and
    H.N. Hans.
Fusarium spp.
Fusarium wilt
Fusarium oxysporum Schlechtend.:Fr. (with these formae speciales:) f. sp. benincasae Gerlagh & Ester (wax gourd), f. sp. cucumerinum J.H. Owen (cucumber), f. sp. lagenariae Matuo & Yamamoto (calabash gourd), f. sp. luffae Lawai et al. (vegetable sponge), f. sp. melonis W.C. Snyder & H.N. Hans. (muskmelon), f. sp. momordicae Sun & Huang (bitter melon), f. sp. niveum (E.F. Sm.) W.C. Snyder & H.N. Hans. (watermelon)
Gray mold
Botrytis cinerea Pers.:Fr.
(teleomorph: Botryotinia fuckeliana (de Bary) Whetzel)
Gummy stem blight (vine decline)
Didymella bryoniae (Auersw.) Rehm
= Mycosphaerella melonis (Pass.) Chiu & J.C. Walker
(anamorph: Phoma cucurbitacearum (Fr.:Fr.) Sacc.)
Lasiodiplodia vine decline/fruit rot
Lasiodiplodia theobromae (Pat.) Griffon & Maubl.
= Diplodia natalensis Pole-Evans
Monosporascus root rot/Myrothecium canker (black canker)
Monosporascus cannonballus Pollack & Uecker
Myrothecium roridum Tode:Fr.
Net spot
Leandria momordicae Rangel
Phoma blight
Phoma exigua Desmaz. var. exigua
= Ascochyta phaseolorum Sacc.
Purple stem
Diaporthe melonis Beraha & O'Brien
(anamorph: Phomopsis cucurbitae McKeen)
Phomopsis black stem
Phomopsis sclerotiodes Van Kesteren.
Phyllosticta leaf spot
Phyllosticta cucurbitacearum Sacc.
Phytophthora root rot
Phytophthora spp.
P. capsici Leonian
Pink mold rot
Trichothecium roseum (Pers.:Fr.) Link
Plectosporium blight
Plectosporium tabacinum van Beyma
Powdery mildew
Sphaerotheca fuliginea (Schlechtend.:Fr.) Pollacci
Erysiphe cichoracearum DC.
Pythium fruit rot (cottony leak)
Pythium spp.
Rhizopus soft rot (fruit)
Rhizopus stolonifer (Ehrenb.:Fr.) Vuill.
= R. nigricans Ehrenb.
Scab/gummosis
Cladosporium cucumerinum Ellis & Arth.
Sclerotinia stem rot
Sclerotinia sclerotiorum (Lib.) deBary
Septoria leaf blight
Septoria cucurbitacearum Sacc.
Southern blight (Sclerotium fruit and stem rot)
Sclerotium rolfsii Sacc.
(teleomorph: Athelia rolfsii (Curzi) Tu & Kimbrough)
Sudden wilt
Pythium aphanidermatum (Edson) Fitzp.
Ulocladium leaf spot
Ulocladium consortiale (Thuem.) E. Simmons
Verticillium wilt
Verticillium albo-atrum Reinke & Berthier
V. dahliae Kleb.
Web blight
Rhizoctonia solani Kühn

MISCELLANEOUS DISEASES OR DISORDERS

Air pollution injury
Ozone, sulfur dioxide and others
Bitter fruit
Sunburn injury, physiologic stress
Blossom end rot
Physiological disorder, calcium deficiency, moisture imbalance
Bottle neck of fruit
Incomplete pollination
Measles
Physiological disorder, salt toxicity
Sandburn
Physiological disorder
Sunscald (fruit)
Excessive or intense direct heat/ solar injury
Windburn
Physiological disorder

NEMATODES, PARASITIC

Dagger, American
Xiphinema americanum Cobb
Lesion
Pratylenchus spp.
Pin
Paratylenchus spp.
Reniform
Rotylenchulus reniformis Linford & Oliviera
Ring
Circonemella spp.
Root-knot
Meloidogyne spp.
Spiral
Helicotylenchus spp.
Sting
Belonolaimus longicaudatus Rau
Stubby-root
Paratrichodorus minor (Colbran) Steiner
Stunt
Tylenchorhynchus claytoni Steiner

VIRUS DISEASES

(Also mycoplasmalike organisms [MLO])
Aster yellows
MLO
Chlorotic leaf spot
Bean yellow mosaic virus (BYMV)
Curly top
Beet curly top virus (BCTV)
Cucumber green mottle
Cucumber green mottle mosaic virus (CGMMV)
Cucumber mosaic
Cucumber mosaic virus (CMV)
Cucumber vein yellowing
Cucumber vein yellowing virus (CVYV)
Lettuce infectious yellows
Lettuce infectious yellows virus (LIYVV)
Melon leaf curl
Melon leaf curl virus (MLCV)
Melon necrotic spot
Melon necrotic spot virus (MNSV)
Mosaic
Papaya ringspot virus W strain (PRSV-W)
Muskmelon vein necrosis
Muskmelon vein necrosis virus (MkVNV)
Squash leaf curl
Squash leaf curl virus (SqLCV)
Squash mosaic
Squash mosaic virus (SqMV)
Tobacco ringspot
Tobacco ringspot virus (TobRSV)
Tomato ringspot
Tomato ringspot virus (TRSV)
Tomato spotted wilt
Tomato spotted wilt virus (TSWV)
Watermelon mosaic
Watermelon mosaic virus (WMV)
Zucchini yellows
Zucchini yellows mosaic virus (ZYMV)