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Important New York Vegetable Diseases

For Homeowners and Roadside Gardeners

Thomas A. Zitter, Professor, Plant Pathology

Fall 2005

See Chart Below

IMPORTANT NEW YORK VEGETABLE DISEASES

Crop	Disease	Causal Agent/Vector	Publication		Agent Type/ Source
Asparagus	Fusarium wilt & crown rot	Fusarium oxysporum and F. moniliforme	BU, web, PG		F/SB
	Rust	Puccinia asparagi	BU, web, PG		F

Bean	Brown spot	Pseudomonas syringae pv. syringae	FS, web, PG		B/SB
	Common blight (fuscous)	Xanthomonas phaseoli pv.phaseoli	FS, web, PG		B/SB
	Halo blight	Pseudomonas syringae pv. phaseolicola	FS, web, PG		B/SB
	Angular leaf spot	Phaeoisariopsis griseola	PG		F
	Anthracnose	Colletotrichum lindemuthianum	FS, web, PG		F/SB
	Black root rot	Thielaviopsis basicola			F
	Dry root rot	Fusarium solani f. sp. phaseoli	GE, web, PG		F
	Gray mold	Botrytis cinerea	PG		F
	Pythium root rot	P. debaryanum; P. ultimum	GE, PG		O
	Rhizoctonia root rot	Rhizoctonia solani	GE, PG		F
	Rust	Uromyces phaseoli	PG, PG		F
	White mold	Sclerotinia sclerotiorum	GE, web, PG		F
	Common mosaic	Common Bean Mosaic Virus (BV 1)/aphids	FS, web, PG		V/SB
	Yellow mosaic	Bean Yellow Mosaic Virus (BV 2)/aphids	FS, web, PG		V

Bean, Fava	Charcoal rot	Macrophomina phaseolina	PG		F
	Chocolate spot	Botrytis fabae	PG		F

Beet	Damping-off	Rhizoctonia solani plus other genera	GE, web , PG		F
	Leaf spot	Cercospora beticola	PG		F
	Heart rot	Lack of boron			P

Carrot	Soft rot	Erwinia carotovora			B
	Alternaria leaf blight	Alternaria dauci	FS, web, PG		F/SB
	Cercospora leaf blight	Cercospora carotae	FS, web, PG		F/SB
	Nematode	Root knot nematode (Meloidogyne)	GE, web, PG		N
	Yellows	Aster yellows/leafhoppers			PH

Celery	Early blight	Cercospora apii	PG		F/SB
	Late blight	Septoria apii	PG		F/SB
	Yellows	Fusarium oxysporum f. sp.	PG		F
	Nematode	Root knot nematode (Meloidogyne)	PG		N
	Blackheart	Calcium deficiency	PG		P
	Cracked stem	Boron deficiency	PG		P
	Cucumber mosaic	Cucumber Mosaic Virus (CMV)/aphids	FS, web, PG		V

Crucifers	(Cabbage, Cauliflower, Broccoli, Brussel Sprouts, Turnips)
	Black rot	Xanthomonas campestris pv. campestris	FS, web, PG		B/SB
	Alternaria leaf spot	Alternaria brassicicola (A. brassicae on rape)	PG		F/SB
	Blackleg	Phoma lingam	PG		F/SB
	Clubroot	Plasmodiophora brassicae	FS, web, PG		F
	Downy mildew	Peronospora parasitica	PG		O
	White mold	Sclerotinia sclerotiorum	FS, web, PG		F
	Wire stem, bottom rot, head rot	Rhizoctonia solani	PG		F
	Yellows	Fusarium oxysporum f. sp. conglutinans	FS, web, PG		F
	Mosaic	Cauliflower or Turnip Mosaic Virus (CaMV, TuMV)	FS, web, PG		V

Cucurbits	(Muskmelon, Watermelon, Cucumber, Squash, Pumpkin)
	Angular leaf spot — w. squash	Pseudomonas syringae pv. lachrymans		FS, web, PG		B/SB
	Bacterial wilt	Erwinia tracheiphila/cucumber beetles		FS, web, PG		B
	Bacterial leaf spot	Xanthomonas campestris pv. cucurbitae		FS, PG		B/SB
	Anthracnose	Colletotrichum orbiculare		FS, web		F/SB
	Choanephora fruit rot — squash	Choanephora cucurbitarum		PG		F
	Downy mildew	Pseudoperonospora cubensis		FS,web, PG		O/wind
	Fusarium wilt — muskmelon	Fusarium oxysporum f. sp. melonis		FS, web, PG		F/SB
	Gummy stem blight, black rot — squash, pumpkin	Didymella bryoniae		FS, web, PG		F/SB
	Leaf blight — melon	Alternaria cucumerina		FS, web, PG		F
	Phytophthora blight	Phytophthora capsici		FS, web, PG		O/SB
	Plectosporium blight	Plectosporium tabacinum		web,PG,PG		F
	Powdery mildew	Podosphaera xanthii (FormerlySphaerotheca fuliginea) also Erysiphe cichoracearum		FS, web, PG		F/wind
	Sudden wilt - muskmelon	CMV, Verticillium, stress		PG		F, V
	Scab	Cladosporium cucumerinum		FS, web, PG		F/SB
	Mosaic	CMV, SqMV, WMV, PRSV, ZYMV/aphids		FS, web, PG		V

Eggplant	Phytophthora blight	Phytophthora capsici		FS, web, PG		O/SB
	Verticillium wilt	Verticillium sp.		FS, web, PG		F

Lettuce	Soft rot	Erwinia carotovora		PG		B
	Bottom rot	Rhizoctonia solani		PG		F
	Downy mildew	Bremia lactucae		PG		F
	Drop	Sclerotinia sclerotiorum		PG		F
	Gray mold	Botrytis cinerea		PG		F
	Root knot	Root knot nematode (Meloidogyne)		GE, web, PG		N
	Tip burn	Calcium deficiency, high temperature				P
	Aster yellows	Aster yellows/leafhoppers		FS, web, PG		PH
	Big vein	Virus + Olpidium fungus vector		FS, web, PG		V, F
	Mosaic	Viruses — LMV, CMV, BBWV, TuMV/aphids		FS, web, PG		V/SB

Onion	Soft rot	Erwinia carotovora pv. carotovora		PG		B
	Downy mildew	Peronospora destructor		FS, web,PG		O
	Fusarium basal rot	Fusarium oxysporum f. sp. cepae		PG		F
	Leaf blight (blast)	Botrytis squamosa		FS, web,PG		F
	Neck rot	Botrytis alii		PG		F/SB
	Pink root	Phoma terrestris		PG		F
	Purple blotch	Alternaria porri		PG		F
	Smut	Urocystis cepulae		PG		F
	Bloat or bulb nematode	Bloat nematode (Ditylenchus dipsaci)		PG		N
	Root knot	Root knot nematode (Meloidogyne)		GE, web		N

Pea	Root rots	Several soilborne fungi (Aphanomyces, Fusarium, Phythium, Rhizoctonia)				F,O
	Viruses	Pea Enation Mosaic, Pea Stunt, Pea Streak, Bean Yellow Mosaic/aphids		FS, web		V

Pepper	Bacterial spot	Xanthomonas campestris pv. vesicatoria		FS, web		B/SB
	Anthracnose	Colletotrichum gloesporioides				F
	Gray Mold (usually Gr. Hs)	Botrytis cinerea		PG		F
	Damping off	Several fungus species		PG		F
	Phytophthora blight	Phytophthora capsici		FS, web		FS,web
	Powdery Mildew	Oidiopsis sicula (anamorph);Leveillula taurica (teleomorph)		PG		PG
	White mold	Sclerotinia sclerotiorum		PG		F
	Blossom end rot	Calcium deficiency		PG		P
	Mosaic	CMV/aphids		FS, web,PG		V

Potato	Common scab	Streptomyces scabies		FS, web,PG		B, TB
	Ring rot	Corynebacterium sepedonicum		BU, web,PG		B, TB
	Blackleg	Erwinia atroseptica		BU, web,PG		B, TB
	Black dot	Colletotrichum coccodes		FS, web,PG		F, TB
	Early blight	Alternaria solani		FS, web,PG		F, TB
	Fusarium tuber rot	Fusarium sambucinum		FS, web,PG		F, TB
	Fusarium wilt	Fusarium spp.		BU, web,PG		F, TB
	Late blight	Phytophthora infestans		FS, web,PG		F, TB
	Leak	Pythium spp.		web		O
	Pink Rot	Phytophthora erythroseptica		web		O
	Powdery scab	Spongospora subterranea		BU, web,PG		F, TB
	Rhizoctonia	Rhizoctonia solani		BU, web,PG		F, TB
	Silver scurf	Helminthosporium solani		FS, web,PG		F, TB
	Verticillium wilt	Verticillium albo-atrum		BU, web,PG		F, TB
	Golden nematode	Heterodera rostochiensis		PG		N
	Leafroll	Potato Leafroll Virus/aphids		FS, web,PG		V, TB
	Mosaics	X, A and Y viruses/aphids		FS, web,PG		V, TB

Radish	Black root	Aphanomyces raphani		PG		F
	Downy mildew	Peronospora parasitica		PG		O
	White rust	Albugo candida		PG		F

Spinach	Downy mildew (blue mold)	Peronospora effusa				O
	White rust	Albugo occidentalis				F
	Blight (Mosaic)	Cucumber mosaic virus/aphids		FS, web,PG		V
	Mosaic	Broad Bean wilt virus/aphids		FS, web,PG		V

Sweet Corn	Bacterial wilt (Stewart’s)	Erwinia stewartii		FS, web,PG		B
	Common rust	Puccinia sorghi		FS, web,PG		F
	Common smut	Ustilago maydis		FS, web,PG		F
	Crazy top (Downy mildew)	Sclerophthora macrospora				O
	Northern leaf blight	Helminthosporium turcicum (Exserohilum)				F
	Barley yellow dwarf	Barley Yellow Dwarf virus/aphids		Web,PG		V
	Maize dwarf mosaic	Maize Dwarf Mosaic Virus/aphids		FS, web,PG		V

Tomato	Bacterial canker	Clavibacter michiganense subsp. michiganense		FS, web,PG		B/SB
	Bacterial speck	Pseudomonas syringae pv. tomato		FS, web,PG		B/SB
	Bacterial spot	Xanthomonas campestris pv. vesicatoria		FS, web,PG		B/SB
	Anthracnose	Colletotrichum coccodes		FS, web,PG		F
	Damping off	Phythium and Rhizoctonia species		PG		F
	Early blight	Alternaria tomatophila		FS, web		F/SB
	Fusarium wilt	Fusarium oxysporum f. sp. lycopersici				F/SB
	Gray mold	Botrytis cinerea		FS, web		F
	Late blight	Phytophthora infestans		FS, web		O/wind
	Leaf mold (G.H. only)	Fulvia (Cladosporium) fulvum				F/SB
	Septoria leaf spot	Septoria lycopersici		FS, web		F/SB
	Soil rot	Rhizoctonia solani				F
	Verticillium wilt	Verticillium albo-atrum		FS, web		F
	White mold	Sclerotinia sclerotiorum				F
	Root knot	Root knot nematode (Meloidogyne)				N
	Blossom end rot	Calcium deficiency		FS, web		P
	Magnesium deficiency	Lack of adequate Mg				P
	Walnut wilt	Nearness to walnut tree				P
	Cucumber mosaic	Cucumber mosaic virus/aphids		FS, web		V
	Graywall (blotchy ripening)	TMV, bacterial, physiological				V,B,P
	Double virus streak	Potato virus X and TMV/mechanical		FS, web		V,SB
	Tobacco mosaic	Tobacco Mosaic Virus/mechanical		FS, web		V,SB

Abbreviations: Disease Agents: B = bacteria, O = oomycete, F = fungus, V = virus, N = nematode, PH = phytoplasmas, P = physiological Sources of Inoculum: SB = seedborne, TB = tuber borne, Wind = blown in from other areas; otherwise soilborne inoculum Publication Sources: Information about diseases other than the web site (web = vegetablemdonline. ppath.cornell.edu) or Photo Gallery (PG), can be found in FACT SHEET (FS), BULLETIN (BU), or Geneva Experiment Station Bulletins (GE) and are available on the web site or from the following sources: Local Cornell Cooperative Extension Office; Cornell Media Services, 7 Business & Technology Park, Ithaca, NY 14853 (607) 255-2080; or Communication Services, Jordan Hall, NYSAES, Geneva, NY 14456 (315) 787-2248. T. A. Zitter, Sept 29, 2005

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