Preface ......................................................... 8
Acknowledgements ................................................ 9
PART 1
Introduction to vegetable crops and diseases
VEGETABLE PRODUCTION
The increasing importance of vegetables ........................ 12
Vegetable commodities .......................................... 13
Technological advances ......................................... 14
Challenges in vegetable production ............................. 15
The challenge of vegetable diseases ............................ 16
CAUSES OF DISEASE
Diseases caused by biotic agents ............................... 18
Bacteria ....................................................... 18
Viruses ........................................................ 20
Fungi .......................................................... 22
Fungus-like pathogens .......................................... 24
Disorders caused by abiotic factors and physiological
conditions ..................................................... 24
DIAGNOSING DISEASE
The importance of timely, accurate diagnoses ................... 31
Overall strategy ............................................... 31
Asking the right questions ..................................... 31
Questions about the healthy plant .............................. 32
Questions about the unhealthy plant ............................ 32
Questions about possible agents and factors .................... 33
Questions about the surrounding environment, growing
conditions, production practices ............................... 33
Conducting the examination ..................................... 35
Incorporating laboratory tests ................................. 35
Diagnosing virus diseases ...................................... 36
Digitally assisted diagnosis ................................... 36
Compiling information and drawing a conclusion ................. 36
CONTROLLING DISEASE
Criteria for commercial control of vegetable diseases .......... 38
Disease control options ........................................ 38
Other aspects of disease management ............................ 49
PART 2
Diseases of vegetable crops
ALLIACEAE (onion family)
Bacterial diseases
Pseudomonas syringae pv. porri
Bacterial blight ............................................ 54
Fungal diseases
Alternaria porri,
Stemphylium vesicarium
Purple blotch ............................................... 56
Aspergillus niger
Black mold .................................................. 58
Botryotinia squamosa
Botrytis leaf blight, Botrytis blast ........................ 59
Botrytis allii
Neck rot .................................................... 61
Fusarium culmorum, F. oxysporum,
F. proliferatum
Fusarium basal plate rot .................................... 63
Mycosphaerella allii, M. allii-cepae
Cladosporium leaf blotch .................................... 64
Penicillium hirsutum
Penicillium mold, blue mold ................................. 66
Peronospora destructor
Downy mildew ................................................ 67
Phoma terrestris
Pink root ................................................... 69
Phytophthora porri
White tip ................................................... 70
Puccinia allii
Rust ........................................................ 72
Sclerotium cepivorum
White rot ................................................... 74
Urocystis cepulae
Smut ........................................................ 77
Viral diseases
Garlic yellow stripe virus,
Garlic yellow streak virus,
Leek yellow stripe virus,
Garlic mosaic ............................................... 78
Onion yellow dwarf virus
Onion yellow dwarf .......................................... 79
APIACEAE (parsley family)
Аpium graveolens (celery)
Bacterial diseases
Aster yellows phytoplasma
Aster yellows ............................................... 80
Pseudomonas syringae pv. apii
Bacterial leaf spot ......................................... 82
Fungal diseases
Cercospora apii
Early blight ................................................ 83
Fusarium oxysporum f. sp. apii
Fusarium yellows ............................................ 85
Phoma apiicola
Phoma crown and root rot .................................... 86
Pythium spp.
Damping-off, Pythium root rot ............................... 87
Sclerotinia sclerotiorum
Pink rot .................................................... 88
Septoria apiicola
Late blight ................................................. 90
Thanatephorus cucumeris
Crater spot ................................................. 91
Viral diseases
Celery mosaic virus
Celery mosaic ............................................... 92
Cucumber mosaic virus
Cucumber mosaic ............................................. 93
Abiotic disorders
Blackheart .................................................. 94
DAUCUS CFROTA(carrot)
Bacterial diseases
Xanthomonas campestrsi pv. carotae
Bacterial leaf blight ....................................... 95
Fungal diseases
Alternaria dauci
Alternaria leaf blight ...................................... 96
Alternaria radicina
Black rot ................................................... 98
Athelia arachnoidea
Crater rot ................................................. 100
Athelia rolfsii
Southern blight ............................................ 101
Cercospora carotae
Cercospora leaf blight ..................................... 102
Erysiphe heraclei,
Leveillula spp.
Powdery mildew ............................................. 103
Helicobasidium brebissonii
Violet root rot ............................................ 105
Mycocentrospora acerina
Licorice rot ............................................... 107
Pythium violae, P. sulcatum
Cavity spot ................................................ 108
Sclerotinia minor, S. sclerotiorum
White mold, cottony rot,watery soft rot .................... 111
Streptomyces scabies
Scab ....................................................... 112
Thanatephorus cucumeris
Crown and root rot ......................................... 113
Thielaviopsis basicola,
Chalaropsis thielaviodes
Black mold ................................................. 114
Uromyces graminis, U. lineolatus
Rust ....................................................... 115
Viral diseases
Carrot red leaf virus,
Carrot mottle virus
Carrot motley dwarf ........................................ 116
PASTINACA SATIVA(parsnip)
Fungal diseases
Erysiphe heraclei
Powdery mildew ............................................. 118
Itersonilia perplexans, I. pastinaceae
Itersonilia canker, black canker ........................... 118
Phloeospora heraclei
Phloeospora leaf spot ...................................... 120
Phoma complanata
Phoma canker ............................................... 121
Plasmopara umbelliferarum
Downy mildew .............................................. 122
Ramularia pastinacae
Ramularia leaf spot ........................................ 123
Viral diseases
Parsnip yellow fleck virus
Parsnip yellow fleck ....................................... 124
PETROSELINUM CRISPUM (parsley)
Fungal diseases
Erysiphe heraclei,
Leveillula lanuginosa
Powdery mildew ............................................. 126
Phytophthora spp., Pythium spp.
Root rot ................................................... 126
Sclerotinia sclerotiorum
White mold ................................................. 127
Septoria petroselini
Septoria blight ............................................ 128
ASPARAGUS OFFICINALIS (Asparagus)
Fungal diseases
Cercospora asparagi
Cercospora blight .......................................... 129
Fusarium oxysporum f.sp. asparagi,
F. proliferatum
Fusarium crown and root rot ................................ 130
Helicobasidium brebissonii,
Zopfia rhizophila
Root rots .................................................. 132
Phytophthora megasperma,
Phytophthora spp.
Phytophthora spear and crown rot ........................... 133
Pleospora herbarum
Purple spot ................................................ 134
Puccinia asparagi
Rust ....................................................... 135
Viral diseases
Asparagus virus 1, 2,3,
Tobacco streak virus ....................................... 137
BETA VULGARIS (beet)
Fungal diseases
Aphanomyces cochlioides
Damping-off, black root rot ................................ 138
Cercospora beticola
Cercospora leaf spot ....................................... 140
Erysiphe betae
Powdery mildew ............................................. 141
Peronospora farinosa f. sp. betae
Downy mildew ............................................... 142
Pleospora bjoerlingii
Black leg .................................................. 143
Ramularia beticola
Ramularia leaf spot ........................................ 145
Streptomyces spp.
Scab ....................................................... 146
Uromyces betae
Rust ....................................................... 147
Viral diseases
Beet curly top virus
Beet curly top ............................................. 148
Beet leaf curl virus
Beet leaf curl ............................................. 149
Beet mild yellowing virus
Beet mild yellowing ........................................ 150
Beet mosaic virus
Beet mosaic ................................................ 151
Beet necrotic yellow vein virus
Beet necrotic yellow vein,
Rhizomania ................................................. 151
Beet pseudo-yellows virus
Beet pseudo-yellows ........................................ 152
Beet western yellows virus
Beet western yellows ....................................... 153
Beet yellows virus
Beet yellows ............................................... 154
BRASSICACEAE (mustard family)
Bacterial diseases
Erwinia spp., Pseudomonas spp.
Bacterial head/spear rot
of broccoli ................................................ 155
Pseudomonas syringae pv. alisalensis
Bacterial blight ........................................... 157
Pseudomonas syringae pv. maculicola
Bacterial leaf spot ........................................ 158
Xanthomonas campestris pv.campestris
Black rot .................................................. 159
Fungal diseases
Albugo Candida
White rust, white blister .................................. 162
Alternaria brassicae, A. brassicicola
Alternaria leaf spot/head rot, dark leaf spot .............. 164
Botrytis cinerea
Gray mold .................................................. 167
Erysiphe cruciferarum
Powdery mildew ............................................. 168
Fusarium oxysporum f. sp. conglutinans,
F. oxysporum f. sp. raphani
Fusarium wilt, Fusarium yellows ............................ 169
Leptosphaeria maculans, L. biglobosa
Black leg, Phoma leaf spot and canker ...................... 171
Mycosphaerella brassicicola
Ring spot .................................................. 174
Mycosphaerella capsellae
White leaf spot ............................................ 176
Peronospora parasitica
Downy mildew ............................................... 178
Plasmodiophora brassicae
Clubroot ................................................... 181
Phytophthora brassicae
Phytophthora storage rot ................................... 186
Phytophthora megasperma
Phytophthora root rot ...................................... 184
Pyrenopeziza brassicae
Light leaf spot ............................................ 185
Sclerotinia minor, S. sclerotiorum
White mold, Sclerotinia stem rot, watery soft rot .......... 189
Thanatephorus cucumeris
Rhizoctonia diseases: damping-off, wirestem,
bottom/root rot ............................................ 191
Verticillium dahliae, V. longisporum
Verticillium wilt .......................................... 196
Viral diseases
Beet western yellows virus
Beet western yellows ....................................... 194
Cauliflower mosaic virus
Cauliflower mosaic ......................................... 197
Turnip mosaic virus
Turnip mosaic .............................................. 198
CAPSICUM (pepper)
Bacterial diseases
Xanthomonas campestris pv. vesicatoria
Bacterial spot ............................................. 199
Fungal diseases
Athelia rolfsii
Southern blight ............................................ 201
Botrytis cinerea
Gray mold .................................................. 202
Colletotrichum capsici, C. coccodes,
C. gloeosporioides
Anthracnose ................................................ 204
Leveillula taurica
Powdery mildew ............................................. 205
Phytophthora capsici, P. nicotianae var. parasitica
Phytophthora blight/root and crown rots .................... 206
Phytophthora spp., Pythium spp., Rhizoctonia solatti
Damping-off, Pythium root rot .............................. 208
Sclerotinia minor, S. sclerotiorum
White mold, Sclerotinia rot ................................ 210
Stemphylium solani, S. lycopersici
Gray leaf spot ............................................. 211
Verticillium dahliae
Verticillium wilt .......................................... 212
Viral diseases
Beet curly top virus
Beet curly top ............................................. 214
Cucumber mosaic virus
Cucumber mosaic ............................................ 218
Pepper mild mottle virus
Pepper mild mottle ......................................... 219
Potato virus Y
Potato virus Y ............................................. 215
Sinaloa tomato leaf curl virus
Sinaloa tomato leaf curl ................................... 217
Tobacco etch virus
Tobacco etch ............................................... 217
Tobacco mosaic virus, Tomato mosaic viruses
Tobacco mosaic, tomato mosaic .............................. 218
Tomato spotted wilt virus
Tomato spotted wilt ........................................ 218
CUCURBITACEAE (gourd family)
Bacterial diseases
Acidovorax avenae subsp. citrulli
Bacterial fruit blotch ..................................... 220
Erwinia tracheiphila
Bacterial wilt ............................................. 222
Pseudomonas syringae pv. lachrymans
Angular leaf spot .......................................... 224
Serratia marcescens
Cucurbit yellow vine disease ............................... 225
Fungal diseases
Acremonium cucurbitacearum,
Fusarium spp., Phytophthora spp.,
Pythium spp., Rhizoctonia solani,
Rhizopycnis vagum
Damping-off, root rots ..................................... 226
Cladosporium cucumerinum
Scab ....................................................... 228
Didymella bryoniae
Gummy stem blight, black rot ............................... 230
Erysiphe cichoracearum, Sphaerotheca fuliginea,
Leveillula taurica
Powdery mildew ............................................. 232
Fusarium oxysporum f. sp. cucumerinum, f. sp. melonis,
f. sp. niveum, f. sp. radicis-cucumerinum
Fusarium wilt, Fusarium root/stem rot ...................... 234
Fusarium solani f. sp. cucurbitae
Fusarium crown and foot rot ................................ 236
Glomerella lagenarium
Anthracnose ................................................ 238
Macrophomina phaseolina
Charcoal rot ............................................... 240
Monosporascus cannonballus
Monosporascus root rot and vine decline .................... 241
Phytophthora capsici
Phytophthora crown and root rot ............................ 243
Pseudoperonospora cubensis
Downy mildew ............................................... 244
Verticillium dahliae
Verticillium wilt .......................................... 246
Viral diseases
Cucumber mosaic virus
Cucumber mosaic ............................................ 247
Papaya ringspot virus type W
Papaya ringspot ............................................ 248
Squash leaf curl virus
Squash leaf curl ........................................... 248
Squash mosaic virus
Squash mosaic .............................................. 249
Tobacco ringspot virus
Tobacco ringspot ........................................... 249
Watermelon mosaic virus
Watermelon mosaic virus .................................... 250
Zucchini yellow mosaic virus
Zucchini yellow mosaic ..................................... 250
FABACEAE (pea family)
Phaseolus species (beans)
Bacterial diseases
Pseudomonas syringae pv. phaseolicola
Halo blight ................................................ 252
Xanthomonas campestris pv. phaseoli
Common bacterial blight .................................... 254
Fungal diseases
Aphanomyces euteiches, Fusarium oxysporum f. sp.
phaseoli, Phoma medicaginis var. pinodella, Pythium spp.,
Rhizoctonia solani, Thielaviopsis basicola
Root/foot rot complex ...................................... 256
Botrytis cinerea
Gray mold .................................................. 258
Erysiphe polygoni
Powdery mildew ............................................. 259
Fusarium oxysporum f. sp. phaseoli
Fusarium wilt, Fusarium yellows ............................ 260
Glomerella lindemuthiana
Anthracnose ................................................ 260
Sclerotinia sclerotiorum, S. trifoliorum, S. minor
White mold, Sclerotinia rot ................................ 262
Uromyces appendiculatus
Rust ....................................................... 265
Viral diseases
Bean common mosaic virus
Bean common mosaic ......................................... 267
Bean yellow mosaic virus
Bean yellow mosaic ......................................... 268
PISUM SATIVUM (pea)
Bacterial diseases
Pseudomonas syringae pv. pisi
Bacterial blight ........................................... 269
Fungal diseases
Aphanomyces euteiches
Aphanomyces root rot, common root rot ...................... 270
Aphanomyces euteiches, Fusarium solani f. sp. pisi,
Phoma medicaginis var. pinodella, Pythium spp.,
Rhizoctonia solani, Thielaviopsis basicola
Foot rot complex ........................................... 272
Ascochyta pisi
Leaf and pod spot .......................................... 274
Botrytis cinerea
Gray mold .................................................. 275
Erysiphe pisi
Powdery mildew ............................................. 276
Fusarium oxysporum f. sp. pisi
Fusarium wilt .............................................. 277
Mycosphaerella pinodes
Ascochyta blight ........................................... 278
Peronospora viciae
Downy mildew ............................................... 280
Pythium spp.
Pythium root rot, damping off ................................. 282
Sclerotinia minor, S. sclerotiorum, S. trifoliorwn
White mold, Sclerotinia rot ................................ 283
Viral diseases
Bean leaf roll virus
Bean leaf roll ............................................. 283
Pea early browning virus
Pea early browning ......................................... 284
Pea enation mosaic virus
Pea enation mosaic ......................................... 285
Pea seedborne mosaic virus
Pea seedborne mosaic ....................................... 286
Pea streak virus
Pea streak ................................................. 286
VICIA FABA (broad bean)
Fungal diseases
Aphanomyces euteiches, Fusarium spp., Pythium spp.,
Phytophthora megasperma, Rhizoctonia solani
Fusarium and other root rots ............................... 287
Botrytis fabae, B. cinerea
Chocolate spot ............................................. 288
Didymella fabae
Leaf and pod spot .......................................... 290
Peronospora viciae
Downy mildew ............................................... 291
Sclerotinia minor, S. sclerotiorum, S. trifoliorum
White mold, Sclerotinia rot ................................ 292
Uromyces vicia-fabae
Rust ....................................................... 293
Viral diseases
Broad bean stain virus, Broad bean true mosaic virus
Broad bean stain, broad bean true mosaic ................... 295
LACTUCA SATIVA (lettuce)
Bacterial diseases
Aster yellows phytoplasma
Aster yellows .............................................. 296
Pseudomonas cichorii
Varnish spot ............................................... 298
Rhizomonas suberifaciens
Corky root ................................................. 299
Xanthomonas campestris pv. vitians
Bacterial leaf spot ........................................ 301
Fungal diseases
Bremia lactucae
Downy mildew ............................................... 302
Botrytis cinerea
Gray mold .................................................. 304
Fusarium oxysporum f. sp. lactucae
Fusarium wilt .............................................. 306
Golovinomyces cichoracearum
Powdery mildew ............................................. 307
Microdocium panattonianum
Anthracnose, ring spot ..................................... 308
Phoma exigua
Phoma basal rot ............................................ 310
Rhizoctonia solani
Bottom rot ................................................. 311
Sclerotinia minor, S. sclerotiorum
Lettuce drop ............................................... 313
Verticillium dahliae
Verticillium wilt .......................................... 315
Viral diseases
Beet western yellows virus
Beet western yellows ....................................... 317
Lettuce mosaic virus
Lettuce mosaic ............................................. 318
Lettuce necrotic stunt virus
Lettuce dieback ............................................... 320
Mirafiori lettuce virus
Lettuce big vein ........................................... 321
Tomato spotted wilt virus
Tomato spotted wilt ........................................ 323
Turnip mosaic virus
Turnip mosaic .............................................. 324
Abiotic disorders
Ammonium toxicity .......................................... 325
Tipburn .................................................... 326
SOLANUM LYCOPERSICUM (tomato)
Bacterial diseases
Clavibacter michiganensis subsp. michiganensis
Bacterial canker ........................................... 327
Pseudomonas syringae pv. tomato
Bacterial speck ............................................ 330
Xanthomonas campestris pv. vesicatoria
Bacterial spot ............................................. 332
Pseudomonas corrugata
Tomato pith necrosis ....................................... 334
Fungal diseases
Altemaria alternata
Blackmold .................................................. 336
Altemaria alternata f. sp. lycopersid
Altemaria stem canker ...................................... 337
Altemaria solani
Early blight ............................................... 338
Athelia rolfsii
Southern blight ............................................ 340
Botrytis cinerea
Gray mold .................................................. 341
Colletotrichum coccodes, C. gloeosporioides, С dematium
Anthracnose ................................................ 343
Fusarium oxysporum f. sp. lycopersid
Fusarium wilt .............................................. 344
Fusarium oxysporumf. sp. radicis-lycopersici
Fusarium crown and root rot ................................ 346
Leveillula taurica, Oidium lycopersid, O. neolycopersici
Powdery mildew ............................................. 348
Phytophthora capsici, P. cryptogea, P. drechsleri,
P. parasitica
Phytophthora root rot ...................................... 350
Phytophthora infestans
Late blight ................................................ 352
Phytophthora spp., Pythium spp., Rhizoctonia solani
Damping-off, fruit rots .................................... 355
Pyrenochaeta lycopersid
Corky root rot ............................................. 356
Sclerotinia minor, S. sclerotiorum
White mold, Sclerotinia rot ................................ 358
Verticillium dahliae
Verticillium wilt .......................................... 360
Viral diseases
Alfalfa mosaic virus
Alfalfa mosaic ............................................. 361
Beet curly top virus
Beet curly top ............................................. 362
Cucumber mosaic virus
Cucumber mosaic ............................................ 363
Potato virus Y
Potato virus Y ............................................. 363
Tobacco mosaic virus,Tomato mosaic virus
Tobacco mosaic, tomato mosaic ................................. 364
Tomato spotted wilt virus
Tomato spotted wilt ........................................ 364
Tomato yellow leaf curl virus
Tomato yellow leaf curl .................................... 366
Abiotic disorders
Blossom end rot ............................................ 367
SPINACIA OLERACEA (spinach)
Bacterial diseases
Pseudomonas syringae pv. spinacia
Bacterial leaf spot ........................................ 368
Fungal diseases
Albugo occidentalis
White rust ................................................. 369
Aphanomyces cochlioides, Fusarium oxysporum, Pythium
aphanidermatum, P. irregulare, Rhizoctonia solani
Damping-off, root rots ..................................... 370
Cladosporium variabile
Cladosporium leaf spot ..................................... 371
Colletotrichum dematium f. sp. spinadae
Anthracnose ................................................ 373
Fusarium oxysporum I. sp. spinadae
Fusarium wilt .............................................. 374
Peronospora farinosa f. sp. spinadae
Downy mildew, blue mold .................................... 375
Stemphylium botryosum
Stemphylium leaf spot ...................................... 376
Verticillium dahliae
Verticillium wilt .......................................... 378
Viral diseases
Beet curly top virus
Beet curly top ............................................. 379
Beet western yellows virus
Beet western yellows ....................................... 380
Cucumber mosaic virus
Cucumber mosaic ............................................ 381
SPECIALTY AND HERB CROPS
Amoracia rusticana
Horseradish ................................................ 383
Anethum graveolens
Dill ....................................................... 385
Anthriscus cerefolium
Chervil .................................................... 385
Beta vulgaris subsp. cicla
Swiss chard ................................................ 386
Brassica rapa subsp. rapa
Broccoli raab .............................................. 389
Brassica spp.
Mustards ................................................... 390
Cichorium endivia, C. intybus
Endive/escarole, radicchio ................................. 391
Coriandrum sativum
Cilantro ................................................... 396
Cymbopogon citratus
Lemongrass ................................................. 397
Cynara scolymus
Artichoke .................................................. 398
Eruca sativa
Arugula .................................................... 404
Foeniculum vulgare dulce
Fennel ..................................................... 406
Helianthus tuberosus
Jerusalem artichoke ........................................ 407
Mentha spp.
Mint ....................................................... 409
Nepeta cataria
Catnip ..................................................... 410
Ocimum basilicum
Basil ...................................................... 411
Origanum majorana, O. vulgare
Marjoram, oregano .......................................... 413
Physalis ixocarpa
Tomatillo .................................................. 413
Rheum rhubarbarum
Rhubarb .................................................... 414
Rorippa nasturtium-aquaticum
Watercress ................................................. 416
Salvia officinalis
Sage ....................................................... 418
Tragopogon porrifolius, Scorzonera hispanica
Salsify, scorzonera ........................................ 419
Valerianella locusta, V. olitoria
Corn salad ................................................. 420
Zea mays var. saccharata
Sweetcorn .................................................. 421
Glossary ...................................................... 422
Index ......................................................... 437
|