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Integrated Pest Management · Agriculture and Natural Resources

University of California

Diseases of vegetables and melons

The table below lists plant host, disease common name, scientific name, and disease type for pests included in this Web site. Click on the common name to link to more information about the disease. Click on a table heading to sort the column. (requires Javascript)

To see a list of common pests and disorders of a particular plant, view the Veggies & melons menu pages.

Descending = Ascending  Ascending= Descending  Unsorted= Unsorted

Plant or crop host Common name Scientific name Type
artichoke Botrytis rot (gray mold) Botrytis cinerea Fungus
artichoke Gray mold (Botrytis rot) Botrytis cinerea Fungus
artichoke Powdery mildew Leveillula taurica Fungus
asparagus Fusarium wilt Fusarium oxysporum Fungus
asparagus Phytophthora crown and spear rot Phytophthora spp. Oomycete
asparagus Rust Puccinia asparagi Fungus
avocado Avocado root rot Phytophthora cinnamomi Oomycete
avocado Bacterial canker Xanthomonas campestris Bacteria
avocado Dothiorella canker Botryosphaeria spp. Fungus
avocado Dothiorella canker Neofusicoccum spp. Fungus
avocado Phytophthora root and crown rot Phytophthora spp. Oomycete
avocado Sunblotch none Virus
avocado Verticillium wilt Verticillium dahliae Fungus
beans Bean rust Uromyces phaseoli Fungus
beans Curly top Beet curly top virus (BCTV) Virus
beans Damping off Pythium spp. Fungus
beans Damping off Rhizoctonia solani Fungus
beans Fusarium root rot Fusarium solani Fungus
beans Mosaic viruses none Virus
beans Powdery mildew Erysiphe polygoni Fungus
beans Powdery mildew Sphaerotheca fuliginea Fungus
beans White mold Sclerotinia sclerotiorum Fungus
beet Powdery mildew Erysiphe polygoni Fungus
black-eyed pea Powdery mildew Sphaerotheca fuliginea Fungus
broccoli Bacterial leaf spot Pseudomonas syringae Bacteria
broccoli Bacterial soft rot Erwinia spp. Bacteria
broccoli Phytophthora root rot Phytophthora megasperma Oomycete
broccoli Powdery mildew Erysiphe cruciferarum Fungus
brussel sprouts Black blight (Ringspot) Mycosphaerella brassicicola Fungus
brussel sprouts Powdery mildew Erysiphe cruciferarum Fungus
brussel sprouts Ringspot (Black blight) Mycosphaerella brassicicola Fungus
cabbage Fusarium wilt (yellows) Fusarium oxysporum Fungus
cabbage Yellows (Fusarium wilt) Fusarium oxysporum Fungus
cantaloupe Angular leaf spot Pseudomonas syringae Fungus
cantaloupe Curly top Beet curly top virus (BCTV) Virus
cantaloupe Fusarium wilt Fusarium oxysporum Fungus
cantaloupe Leaf spot, Angular Pseudomonas syringae Fungus
cantaloupe Powdery mildew Sphaerotheca fuliginea Fungus
carrot Alternaria leaf blight Alternaria dauci Fungus
carrot Bacterial soft rot Erwinia carotovora Bacteria
carrot Beet leafhopper transmitted virescence agent (BLTVA) Beet leafhopper transmitted virescence agent (BLTVA) Phytoplasma
carrot BLTVA (beet leafhopper transmitted virescence agent) BLTVA (beet leafhopper transmitted virescence agent) Phytoplasma
carrot Cavity spot Pythium violae Oomycete
carrot Cercospora leaf spot Cercospora carotae Fungus
carrot Cottony soft rot (white mold) Sclerotinia sclerotiorum Fungus
carrot Damping off and root dieback Pythium spp. Oomycete
carrot Leaf spot, Cercospora Cercospora carotae Fungus
carrot Powdery mildew Erysiphe heraclei Fungus
carrot Powdery mildew Erysiphe polygoni Fungus
carrot White mold (Cottony soft rot) Sclerotinia sclerotiorum Fungus
cauliflower Powdery mildew Erysiphe cruciferarum Fungus
cole crops Clubroot Plasmodiophora brassicae Fungus
cole crops Downy mildew Peronospora parasitica Oomycete
cole crops Lettuce drop (white mold) Sclerotinia spp. Fungus
cole crops Powdery mildew Erysiphe cruciferarum Fungus
cole crops Verticillium wilt Verticillium dahliae Fungus
cole crops White mold (lettuce drop) Sclerotinia spp. Fungus
corn Bacterial soft rot Erwinia spp. Bacteria
corn Common rust Puccinia sorghi Fungus
corn Common smut Ustilago maydis Fungus
corn Damping off and seed rots Pythium spp. Oomycete
corn Fusarium ear and stalk rot Fusarium spp. Fungus
corn Head smut Sphacelotheca reiliana Fungus
corn Maize dwarf mosaic virus none Virus
cucumber Powdery mildew Erysiphe cichoracearum Fungus
cucumber Powdery mildew Erysiphe cichoracearum Fungus
cucurbits Downy mildew Pseudoperonospora cubensis Oomycete
cucurbits Powdery mildew Sphaerotheca fuliginea Fungus
cucurbits Powdery mildew Sphaerotheca fuliginea Fungus
cucurbits Root rot Phytophthora spp. Oomycete
cucurbits Root rot Pythium spp. Oomycete
cucurbits Verticillium wilt Verticillium dahliae Fungus
cucurbits Viruses none Virus
cucurbits White mold Sclerotinia sclerotiorum Fungus
eggplant Mosaic viruses none Virus
eggplant Phytophthora root and crown rot Phytophthora capsici Oomycete
eggplant Powdery mildew Leveillula taurica Fungus
eggplant Verticillium wilt Verticillium dahliae Fungus
endive Powdery mildew Erysiphe cichoracearum Fungus
lettuce Big vein none Virus
lettuce Botrytis rot (gray mold) Botrytis cinerea Fungus
lettuce Downy mildew Bremia lactucae Oomycete
lettuce Gray mold (Botrytis rot) Botrytis cinerea Fungus
lettuce Lettuce drop (white mold) Sclerotinia spp. Fungus
lettuce Powdery mildew Erysiphe cichoracearum Fungus
lettuce Powdery mildew Erysiphe cichoracearum Fungus
lettuce Viruses various Virus
lettuce White mold (lettuce drop) Sclerotinia spp. Fungus
melon Powdery mildew Erysiphe cichoracearum Fungus
okra Powdery mildew Sphaerotheca fuliginea Fungus
onions and garlic Bacterial soft rots various Bacteria
onions and garlic Basal rot Fusarium spp. Fungus
onions and garlic Black mold Aspergillus niger Fungus
onions and garlic Blue mold rot Penicillium spp. Fungus
onions and garlic Botrytis bulb rot (Neck rot) Botrytis spp. Fungus
onions and garlic Botrytis leafspot (leaf blight) Botrytis spp. Fungus
onions and garlic Downy mildew Peronospora destructor Oomycete
onions and garlic Leaf blight (Botrytis leafspot) Botrytis spp. Fungus
onions and garlic Neck rot (Botrytis bulb rot) Botrytis spp. Fungus
onions and garlic Pink root Phoma terrestris Fungus
onions and garlic Purple blotch Alternaria porri Fungus
onions and garlic Stemphylium leaf blight Stemphylium vesicarium Fungus
onions and garlic White rot Sclerotium cepivorum Fungus
parsley Powdery mildew Erysiphe heraclei Fungus
parsnip Powdery mildew Erysiphe heraclei Fungus
pea Ascochyta blight Ascochyta spp. Fungus
pea Damping off and root rot various Fungus
pea Downy mildew Peronospora viciae f.sp. pisi Oomycete
pea Fusarium wilt Fusarium oxysporum Fungus
pea Powdery mildew Erysiphe pisi Fungus
pea Powdery mildew Erysiphe pisi Fungus
pea Virus diseases none Virus
pepper Curly top Beet curly top virus (BCTV) Virus
pepper Mosaic viruses none Virus
pepper Phytophthora root and crown rot Phytophthora spp. Oomycete
pepper Powdery mildew Leveillula taurica Fungus
pepper Spotted wilt virus Tomato spotted wilt virus Virus
pepper Verticillium wilt Verticillium dahliae Fungus
potato Bacterial ring rot Clavibacter michiganensis Bacteria
potato Bacterial soft rot and blackleg Erwinia carotovora Bacteria
potato Common scab Streptomyces spp. Fungus
potato Curly top Beet curly top virus (BCTV) Virus
potato Early blight Alternaria solani Fungus
potato Late blight Phytophthora infestans Oomycete
potato Mosaic viruses none Virus
potato Potato leafroll Potato leaf roll virus Virus
potato Powdery mildew Erysiphe cichoracearum Fungus
potato Powdery scab Spongospora subterranea Fungus
potato Seed piece decay Erwinia carotovora Bacteria
potato Seed piece decay Fusarium spp. Bacteria
potato Verticillium wilt Verticillium dahliae Fungus
pumpkin Fusarium crown and foot rot Fusarium solani Fungus
pumpkin Powdery mildew Erysiphe cichoracearum Fungus
radicchio Powdery mildew Erysiphe cruciferarum Fungus
radish Powdery mildew Erysiphe cruciferarum Fungus
spinach Downy mildew Peronospora farinosa Oomycete
spinach Viruses various Virus
squash Fusarium crown and foot rot Fusarium solani Fungus
squash Powdery mildew Erysiphe cichoracearum Fungus
tomatillo Powdery mildew Leveillula taurica Fungus
tomato Black mold Alternaria alternata Fungus
tomato Buckeye (Phytophthora root rot) Phytophthora spp. Oomycete
tomato Curly top Beet curly top virus (BCTV) Virus
tomato Early blight Alternaria solani Fungus
tomato Fusarium wilt Fusarium oxysporum Fungus
tomato Late blight Phytophthora infestans Oomycete
tomato Phytophthora root rot (Buckeye) Phytophthora spp. Oomycete
tomato Powdery mildew Erysiphe lycopersici Fungus
tomato Powdery mildew Leveillula taurica Fungus
tomato Powdery mildew Leveillula taurica Fungus
tomato Tobacco mosaic virus none Virus
tomato Tomato spotted wilt virus none Virus
tomato Verticillium wilt Verticillium dahliae Fungus
tomato White mold Sclerotinia sclerotiorum Fungus
turnip Powdery mildew Erysiphe cruciferarum Fungus
various vegetables and melons Basal stem rots Mycosphaerella spp. Fungus
various vegetables and melons Basal stem rots Phoma spp. Fungus
various vegetables and melons Damping off and seed rots Fusarium spp. Oomycete
various vegetables and melons Damping off and seed rots Phytophthora spp. Oomycete
various vegetables and melons Damping off and seed rots Pythium spp. Oomycete
various vegetables and melons Damping off and seed rots Rhizoctonia spp. Oomycete
various vegetables and melons Damping off and seed rots Thielaviopsis spp. Oomycete
various vegetables and melons Powdery mildew Leveillula taurica Fungus
watermelon Fusarium wilt Fusarium oxysporum Fungus