Integrated Pest Management · Agriculture and Natural Resources
University of California
All plant diseases
- All diseases
- Flowers
- Fruits
- Lawns & Turf
- Trees & Shrubs
- Vegetables
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)
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| Plant or crop host | Common name | Scientific name | Type |
|---|---|---|---|
| all lawn grasses | Fairy ring | various | Fungus |
| all lawn grasses | Fungi, Nuisance | various | Fungus |
| all lawn grasses | Grease spot (Pythium blight) | Pythium spp. | Oomycete |
| all lawn grasses | Mushrooms | various | Fungus |
| all lawn grasses | Nuisance fungi | various | Fungus |
| all lawn grasses | Powdery mildew | Erysiphe graminis | Fungus |
| all lawn grasses | Pythium blight (grease spot) | Pythium spp. | Oomycete |
| all lawn grasses | Rust | Puccinia spp. | Fungus |
| almond | Almond leaf scorch (Bacterial leaf scorch) | Xylella fastidiosa | Bacteria |
| almond | Armillaria root rot (Oak root fungus) | Armillaria mellea | Fungus |
| almond | Bacterial canker | Pseudomonas syringae | Bacteria |
| almond | Bacterial leaf scorch (almond leaf scorch) | Xylella fastidiosa | Bacteria |
| almond | Brown rot | Monilinia spp. | Fungus |
| almond | Coryneum blight (Shot hole disease) | Wilsonomyces carpophilus | Fungus |
| almond | Crown gall | Agrobacterium tumefaciens | Bacteria |
| almond | Oak root fungus (Armillaria root rot) | Armillaria mellea | Fungus |
| almond | Phytophthora root and crown rot | Phytophthora spp. | Oomycete |
| almond | Scab | Cladosporium (syn. Fusicladium) carpophilum | Fungus |
| almond | Scab | Fusicladium (syn. Cladosporium) carpophilum | Fungus |
| almond | Shot hole disease (Coryneum blight) | Wilsonomyces carpophilus | Fungus |
| almond | Verticillium wilt | Verticillium dahliae | Fungus |
| alyssum | Clubroot | Plasmodiophora brassicae | Fungus |
| annual bluegrass | Brown patch (large patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| annual bluegrass | Dollar spot | various | Fungus |
| annual bluegrass | Fusarium patch (Microdochium patch or pink snow mold) | Microdochium nivale | Fungus |
| annual bluegrass | Large patch (brown patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| annual bluegrass | Microdochium patch (Fusarium patch or pink snow mold) | Microdochium nivale | Fungus |
| annual bluegrass | Pink snow mold (Microdochium patch or Fusarium patch) | Microdochium nivale | Fungus |
| annual bluegrass | Rhizoctonia blight (brown patch, large patch) | Rhizoctonia solani | Fungus |
| apple | Apple mosaic | Ilarvirus | Virus |
| apple | Apple scab | Venturia inaequalis | Fungus |
| apple | Armillaria root rot (Oak root fungus) | Armillaria mellea | Fungus |
| apple | Bacterial blossom blast | Pseudomonas syringae | Bacteria |
| apple | European canker (Necria canker) | Nectria galligena | Fungus |
| apple | Fire blight | Erwinia amylovora | Bacteria |
| apple | Necria canker (European canker) | Nectria galligena | Fungus |
| apple | Oak root fungus (Armillaria root rot) | Armillaria mellea | Fungus |
| apple | Papery bark (Sappy bark) | Trametes versicolor | Fungus |
| apple | Phytophthora root and crown rot | Phytophthora spp. | Oomycete |
| apple | Powdery mildew | Podosphaera leucotricha | Fungus |
| apple | Sappy bark (Papery bark) | Trametes versicolor | Fungus |
| apple | Varnish fungus rot | Ganoderma lucidum | Fungus |
| apricot | Bacterial canker and blast | Pseudomonas syringae | Bacteria |
| apricot | Coryneum blight (Shot hole disease) | Wilsonomyces carpophilus | Fungus |
| apricot | Eutypa dieback | Eutypa lata | Fungus |
| apricot | Powdery mildew | Podosphaera tridactyla | Fungus |
| apricot | Powdery mildew | Sphaerotheca pannosa | Fungus |
| apricot | Shot hole disease (Coryneum blight) | Wilsonomyces carpophilus | Fungus |
| artichoke | Botrytis rot (gray mold) | Botrytis cinerea | Fungus |
| artichoke | Gray mold (Botrytis rot) | Botrytis cinerea | Fungus |
| artichoke | Powdery mildew | Leveillula taurica | Fungus |
| ash | Anthracnose | Discula fraxinea | Fungus |
| ash | Ash dieback | Botryosphaeria stevensii | Fungus |
| asparagus | Fusarium wilt | Fusarium oxysporum | Fungus |
| asparagus | Phytophthora crown and spear rot | Phytophthora spp. | Oomycete |
| asparagus | Rust | Puccinia asparagi | Fungus |
| aspen | Armillaria root rot (Oak root fungus) | Armillaria mellea | Fungus |
| aspen | Oak root fungus (Armillaria root rot) | Armillaria mellea | Fungus |
| aster | Leaf spot diseases | Septoria spp. | Fungus |
| aster | Rust | various | 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 | Avocado sunblotch viroid | Viroid |
| avocado | Verticillium wilt | Verticillium dahliae | Fungus |
| azalea | Ovulinia petal blight | Ovulinia azalea | Fungus |
| barberton daisy | Leaf spot diseases | Alternaria gerberae | Fungus |
| barberton daisy | Leaf spot diseases | Ascochyta gerberae | 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 |
| begonia | Bacterial soft rots, leaf spots, blights, wilts | Erwinia spp. | Bacteria |
| begonia | Leaf spot diseases | Phyllosticta spp. | Fungus |
| begonia | Powdery mildew | Golovinomyces cichoracearum | Fungus |
| bentgrasses | Red thread | Laetisaria fuciformis | Fungus |
| bentgrasses | Take-all patch | Gaeumannomyces graminis var. avenae | Fungus |
| bermudagrass | Brown patch (large patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| bermudagrass | Dollar spot | various | Fungus |
| bermudagrass | Large patch (brown patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| bermudagrass | Leaf spot | Bipolaris spp. | Fungus |
| bermudagrass | Red thread | Laetisaria fuciformis | Fungus |
| bermudagrass | Rhizoctonia blight (brown patch, large patch) | Rhizoctonia solani | Fungus |
| bermudagrass | Spring dead spot | Ophiosphaerella korrae | Fungus |
| black-eyed pea | Powdery mildew | Sphaerotheca fuliginea | Fungus |
| bluegrass | Brown patch (large patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| bluegrass | Fusarium patch (Microdochium patch or pink snow mold) | Microdochium nivale | Fungus |
| bluegrass | Large patch (brown patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| bluegrass | Leaf spot | Bipolaris spp. | Fungus |
| bluegrass | Pink snow mold (Microdochium patch or Fusarium patch) | Microdochium nivale | Fungus |
| bluegrass | Red thread | Laetisaria fuciformis | Fungus |
| bluegrass | Rhizoctonia blight (brown patch, large patch) | Rhizoctonia solani | Fungus |
| bluegrass | Summer patch | Magnaporthe poae | Fungus |
| boxwood | Pseudonectria canker (Volutella canker and blight) | Pseudonectria rousseliana | Fungus |
| boxwood | Volutella canker and blight (Pseudonectria canker) | Pseudonectria rousseliana | 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 |
| buckthorn | Branch and twig dieback | various | Fungus |
| cabbage | Fusarium wilt (yellows) | Fusarium oxysporum | Fungus |
| cabbage | Yellows (Fusarium wilt) | Fusarium oxysporum | Fungus |
| california hazel | Eastern filbert blight | Anisogramma anomala | Fungus |
| camellia | Camellia petal and flower blight | Ciborinia camelliae | Fungus |
| caneberry | Anthracnose | Elsinoe spp. | Fungus |
| caneberry | Armillaria root rot | Armillaria spp. | Fungus |
| caneberry | Botrytis fruit rot (Gray mold) | Botrytis cinerea | Fungus |
| caneberry | Crown gall | Agrobacterium spp. | Bacteria |
| caneberry | Downy mildew | Peronospora sparsa | Oomycete |
| caneberry | Gray mold (Botrytis fruit rot) | Botrytis cinerea | Fungus |
| caneberry | Leaf spot | Mycosphaerella rubi | Fungus |
| caneberry | Orange rust | Arthuriomyces peckianus | Fungus |
| caneberry | Orange rust | Gymnoconia nitens | Fungus |
| caneberry | Phytophthora root rot | Phytophthora spp. | Oomycete |
| caneberry | Powdery mildew | Sphaerotheca macularis | Fungus |
| caneberry | Purple blotch | Septocyta ruborum | Fungus |
| caneberry | Verticillium wilt | Verticillium dahliae | Fungus |
| caneberry | Viruses | none | Virus |
| caneberry | Yellow rust | Phragmidium rubi-idaei | 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 |
| carnation | Alternaria blight | Alternaria spp. | Fungus |
| carnation | Armillaria root rot | Armillaria mellea | Fungus |
| carnation | Bacterial soft rots, leaf spots, blights, wilts | Pseudomonas spp. | Bacteria |
| carnation | Fairy-ring leaf spot | Cladosporium echinulatum | Fungus |
| carnation | Leaf spot, Fairy-ring | Cladosporium echinulatum | Fungus |
| carnation | Leaf spot, Septoria | Septoria dianthi | Fungus |
| carnation | Septoria leaf spot | Septoria dianthi | 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 |
| cherry | Almond leaf scorch (Bacterial leaf scorch) | Xylella fastidiosa | Bacteria |
| cherry | Bacterial leaf scorch (almond leaf scorch) | Xylella fastidiosa | Bacteria |
| cherry | Cherry buckskin (X-disease) | X-disease | Phytoplasma |
| cherry | Cherry leaf spot | Blumeriella jaapii | Fungus |
| cherry | Hairy turkey tail | Trametes hirsuta | Fungus |
| cherry | Leaf spot, Cherry | Blumeriella jaapii | Fungus |
| cherry | Parchment fungus | Stereum spp. | Fungus |
| cherry | Powdery mildew | Podosphaera clandestina | Fungus |
| cherry | Sulfur fungus | Laetiporus sulphureus | Fungus |
| cherry | Turkey tail | Trametes versicolor | Fungus |
| cherry | Varnish fungus rot | Ganoderma lucidum | Fungus |
| cherry | Verticillium wilt | Verticillium spp. | Fungus |
| cherry | Viruses | none | Virus |
| cherry | X-disease (Cherry buckskin) | X-disease | Phytoplasma |
| china aster | Leaf spot diseases | Septoria spp. | Fungus |
| china aster | Rust | various | Fungus |
| chrysanthemum | Leaf spot, Septoria | Septoria chrysanthemi | Fungus |
| chrysanthemum | Septoria leaf spot | Septoria chrysanthemi | Fungus |
| chrysanthemum | Verticillium wilt | Verticillium albo-atrum | Fungus |
| chrysanthemum | Verticillium wilt | Verticillium dahliae | Fungus |
| citrus | Alternaria rot | Alternaria citri | Fungus |
| citrus | Anthracnose | Collectotrichum gloeosporioides | Fungus |
| citrus | Anthracnose | Glomerella cingulata | Fungus |
| citrus | Armillaria root rot (Oak root fungus) | Armillaria mellea | Fungus |
| citrus | Artist's conk | Ganoderma applanatum | Fungus |
| citrus | Brown rot | Phytophthora spp. | Fungus |
| citrus | Citrus blast | Pseudomonas syringae | Fungus |
| citrus | Citrus greening (Huanglongbing disease) | Candidatus Liberibacter asiaticus | Bacteria |
| citrus | Exocortis | Citrus exocortis viroid (CEVd) | Viroid |
| citrus | Hairy turkey tail | Trametes hirsuta | Fungus |
| citrus | Huanglongbing disease (Citrus greening) | Candidatus Liberibacter asiaticus | Bacteria |
| citrus | Oak root fungus (Armillaria root rot) | Armillaria mellea | Fungus |
| citrus | Phytophthora gummosis | Phytophthora spp. | Oomycete |
| citrus | Phytophthora root rot | Phytophthora spp. | Oomycete |
| citrus | Tristeza disease complex | Tristeza virus | Virus |
| citrus | Varnish fungus rot | Ganoderma lucidum | Fungus |
| coffeeberry | Branch and twig dieback | various | 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 |
| conifers | Annosus root disease | Fomes annosus | Fungus |
| conifers | Annosus root disease | Heterobasidion annosum | Fungus |
| conifers | Needle cast fungi | various | 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 | Maize dwarf mosaic virus | Virus |
| cottonwood | Armillaria root rot (Oak root fungus) | Armillaria mellea | Fungus |
| cottonwood | Oak root fungus (Armillaria root rot) | Armillaria mellea | Fungus |
| crape myrtle | Powdery mildew | Erysiphe lagerstroemiae | Fungus |
| cryptomeria | Cryptomeria blight | Pestalotiopsis funerea | Fungus |
| 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 |
| daffodil | Dry rot | Stromatinia gladioli | Fungus |
| daffodil | Smoulder | Botrytis narcissicola | Fungus |
| daffodil | Smoulder | Sclerotinia narcissicola | Fungus |
| dichondra | Southern blight | Sclerotium rolfsii | Fungus |
| dogwood | Anthracnose | Elsinoe corni | Fungus |
| douglas fir | Bacterial gall | Agrobacterium tumefaciens | Bacteria |
| 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 |
| elm | Alcoholic flux (Foamy canker) | none | Unknown |
| elm | Dutch elm disease | Ophiostoma ulmi | Fungus |
| elm | Foamy canker (alcoholic flux) | none | Unknown |
| endive | Powdery mildew | Erysiphe cichoracearum | Fungus |
| fescues | Brown patch (large patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| fescues | Dollar spot | various | Fungus |
| fescues | Fusarium patch (Microdochium patch or pink snow mold) | Microdochium nivale | Fungus |
| fescues | Gray leaf spot | Pyriculria grisea | Fungus |
| fescues | Large patch (brown patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| fescues | Leaf spot | Bipolaris spp. | Fungus |
| fescues | Microdochium patch (Fusarium patch or pink snow mold) | Microdochium nivale | Fungus |
| fescues | Pink snow mold (Microdochium patch or Fusarium patch) | Microdochium nivale | Fungus |
| fescues | Red thread | Laetisaria fuciformis | Fungus |
| fescues | Rhizoctonia blight (brown patch, large patch) | Rhizoctonia solani | Fungus |
| fescues | Southern blight | Sclerotium rolfsii | Fungus |
| fig | Fig mosaic | Fig mosaic emaravirus | Virus |
| fig | Phomopsis canker | Phomopsis spp. | Fungus |
| fig | Souring | none | Yeast |
| filbert | Eastern filbert blight | Anisogramma anomala | Fungus |
| fine fescues | Summer patch | Magnaporthe poae | Fungus |
| forsythia | Stem gall | Phomopsis spp. | Fungus |
| freesia | Dry rot | Stromatinia gladioli | Fungus |
| geranium | Alternaria leaf spot | Alternaria alternata | Fungus |
| geranium | Leaf spot, Alternaria | Alternaria alternata | Fungus |
| gerbera daisy | Leaf spot diseases | Alternaria gerberae | Fungus |
| gerbera daisy | Leaf spot diseases | Ascochyta gerberae | Fungus |
| gladiolus | Curvularia leaf spot | Curvularia spp. | Fungus |
| gladiolus | Dry rot | Stromatinia gladioli | Fungus |
| gladiolus | Leaf spot, Curvularia | Curvularia spp. | Fungus |
| gladiolus | Leaf spot, Stemphylium | Stemphylium spp. | Fungus |
| gladiolus | Scab | Pseudomonas gladioli | Fungus |
| gladiolus | Stemphylium leaf spot | Stemphylium spp. | Fungus |
| grape | Armillaria root rot (Oak root fungus) | Armillaria mellea | Fungus |
| grape | Bunch rot (Gray mold) | Botrytis cinerea | Fungus |
| grape | Crown gall | Agrobacterium tumefaciens | Bacteria |
| grape | Downy mildew | Plasmopara viticola | Oomycete |
| grape | Eutypa dieback | Eutypa lata | Fungus |
| grape | Gray mold (Bunch rot) | Botrytis cinerea | Fungus |
| grape | Leaf spot and Phomopsis cane | Phomopsis viticola | Fungus |
| grape | Measles | Phaeoacremonium spp. | Fungus |
| grape | Oak root fungus (Armillaria root rot) | Armillaria mellea | Fungus |
| grape | Phomopsis cane and leaf spot | Phomopsis viticola | Fungus |
| grape | Phytophthora crown and root rot | Phytophthora megasperma | Oomycete |
| grape | Pierce's disease | Xylella fastidiosa | Bacteria |
| grape | Powdery mildew | Erysiphe necator | Fungus |
| grape | Viruses | various | Virus |
| hackberry | Escallonia dieback | none | Unknown |
| hazlenut | Eastern filbert blight | Anisogramma anomala | Fungus |
| hemlock | Twig blights | Kabatina juniperi | Fungus |
| iris | Fire spot | Heterosporium gracile | Fungus |
| iris | Ink spot | Drechslera iridis | Fungus |
| juniper | Twig blights | Phomopsis juniperovora | Fungus |
| kentucky bluegrass | Anthracnose | Colletotrichum graminicola | Fungus |
| kentucky bluegrass | Fusarium blight | Fusarium spp. | Fungus |
| kentucky bluegrass | Southern blight | Sclerotium rolfsii | Fungus |
| kikuyugrass | Brown patch (large patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| kikuyugrass | Gray leaf spot | Pyriculria grisea | Fungus |
| kikuyugrass | Large patch (brown patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| kikuyugrass | Leaf spot | Bipolaris spp. | Fungus |
| kikuyugrass | Rhizoctonia blight (brown patch, large patch) | Rhizoctonia solani | Fungus |
| laurel | Coryneum blight (Shot hole disease) | Wilsonomyces carpophilus | Fungus |
| laurel | Shot hole disease (Coryneum blight) | Wilsonomyces carpophilus | Fungus |
| lettuce | Big vein | Lettuce big vein virus | 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 |
| live oak | Drippy acorns (Drippy oak) | Erwinia quercina | Bacteria |
| live oak | Drippy oak (Drippy acorns) | Erwinia quercina | Bacteria |
| london plane tree | Canker stain (Ceratocystis canker) | Ceratocystis fimbriata | Fungus |
| london plane tree | Ceratocystis canker (Canker stain) | Ceratocystis fimbriata | Fungus |
| marigold | Leaf spot diseases | Alternaria spp. | Fungus |
| melon | Powdery mildew | Erysiphe cichoracearum | Fungus |
| nasturtium | Clubroot | Plasmodiophora brassicae | Fungus |
| nectarine | Coryneum blight (Shot hole disease) | Wilsonomyces carpophilus | Fungus |
| nectarine | Peach leaf curl | Taphrina deformans | Fungus |
| nectarine | Peach leaf curl | Taphrina deformans | Fungus |
| nectarine | Powdery mildew | Podosphaera leucotricha | Fungus |
| nectarine | Powdery mildew | Sphaerotheca pannosa | Fungus |
| nectarine | Rust | Tranzschelia discolor | Fungus |
| nectarine | Scab | Cladosporium (syn. Fusicladium) carpophilum | Fungus |
| nectarine | Scab | Fusicladium (syn. Cladosporium) carpophilum | Fungus |
| nectarine | Shot hole disease (Coryneum blight) | Wilsonomyces carpophilus | Fungus |
| nectarine | Turkey tail | Trametes versicolor | Fungus |
| oak | Alcoholic flux (Foamy canker) | none | Unknown |
| oak | Anthracnose | Gloesporium quercum | Fungus |
| oak | Foamy canker (alcoholic flux) | none | Unknown |
| oak | Oak branch dieback | Diplodia quercina | Fungus |
| oak | Oak twig blight | Cryptocline cinerescens | Fungus |
| okra | Powdery mildew | Sphaerotheca fuliginea | Fungus |
| oleander | Oleander knot | Pseudomonas savastanoi pv. nerii | Bacteria |
| oleander | Oleander leaf scorch | Xylella fastidiosa | Bacteria |
| olive | Varnish fungus rot | Ganoderma lucidum | Fungus |
| olive tree | Olive knot | Pseudomonas savastanoi pv. savastanoi | Bacteria |
| 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 |
| palm tree | Palm diseases | various | Fungus |
| pansy | Leaf spot diseases | Alternaria spp. | Fungus |
| pansy | Leaf spot diseases | Cercospora spp. | 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 |
| peach | Coryneum blight (Shot hole disease) | Wilsonomyces carpophilus | Fungus |
| peach | Peach leaf curl | Taphrina deformans | Fungus |
| peach | Peach leaf curl | Taphrina deformans | Fungus |
| peach | Powdery mildew | Podosphaera leucotricha | Fungus |
| peach | Powdery mildew | Sphaerotheca pannosa | Fungus |
| peach | Rust | Tranzschelia discolor | Fungus |
| peach | Scab | Cladosporium (syn. Fusicladium) carpophilum | Fungus |
| peach | Scab | Fusicladium (syn. Cladosporium) carpophilum | Fungus |
| peach | Shot hole disease (Coryneum blight) | Wilsonomyces carpophilus | Fungus |
| peach | Varnish fungus rot | Ganoderma lucidum | Fungus |
| pear | Armillaria root rot (Oak root fungus) | Armillaria mellea | Fungus |
| pear | European canker (Necria canker) | Nectria galligena | Fungus |
| pear | Fire blight | Erwinia amylovora | Bacteria |
| pear | Necria canker (European canker) | Nectria galligena | Fungus |
| pear | Oak root fungus (Armillaria root rot) | Armillaria mellea | Fungus |
| pear | Pear decline | MLOÂ Â | Phytoplasma |
| pear | Pear rust | Gymnosporangium libocedri | Fungus |
| pear | Pear scab | Venturia pirina | Fungus |
| peony | Leaf blotch | Cladosporium paeoniae | Fungus |
| 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 |
| pine | Pitch canker | Fusarium circinatum | Fungus |
| plum | Powdery mildew | Podosphaera tridactyla | Fungus |
| plum | Powdery mildew | Sphaerotheca pannosa | Fungus |
| poplar | Armillaria root rot (Oak root fungus) | Armillaria mellea | Fungus |
| poplar | Oak root fungus (Armillaria root rot) | Armillaria mellea | 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 |
| primrose | Leaf spot diseases | Ramularia primulae | Fungus |
| prune | Powdery mildew | Podosphaera tridactyla | Fungus |
| pumpkin | Fusarium crown and foot rot | Fusarium solani | Fungus |
| pumpkin | Powdery mildew | Erysiphe cichoracearum | Fungus |
| quince | Powdery mildew | Podosphaera leucotricha | Fungus |
| radicchio | Powdery mildew | Erysiphe cruciferarum | Fungus |
| radish | Powdery mildew | Erysiphe cruciferarum | Fungus |
| redberry | Branch and twig dieback | various | Fungus |
| rhamnus | Branch and twig dieback | various | Fungus |
| rhododendron | Ovulinia petal blight | Ovulinia azalea | Fungus |
| rose | Anthracnose | Sphaceloma rosarum | Fungus |
| rose | Black spot | Diplocarpon rosae | Fungus |
| rose | Botrytis blight | Botrytis cinerea | Fungus |
| rose | Crown gall | Agrobacterium tumefaciens | Bacteria |
| rose | Downy mildew | Peronospora sparsa | Oomycete |
| rose | Powdery mildew | Podosphaera pannosa | Fungus |
| rose | Rust | Phragmidium mucronatum | Fungus |
| rose | Viruses | various | Virus |
| ryegrasses | Brown patch (large patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| ryegrasses | Dollar spot | various | Fungus |
| ryegrasses | Fusarium patch (Microdochium patch or pink snow mold) | Microdochium nivale | Fungus |
| ryegrasses | Gray leaf spot | Pyriculria grisea | Fungus |
| ryegrasses | Large patch (brown patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| ryegrasses | Leaf spot | Bipolaris spp. | Fungus |
| ryegrasses | Microdochium patch (Fusarium patch or pink snow mold) | Microdochium nivale | Fungus |
| ryegrasses | Pink snow mold (Microdochium patch or Fusarium patch) | Microdochium nivale | Fungus |
| ryegrasses | Red thread | Laetisaria fuciformis | Fungus |
| ryegrasses | Rhizoctonia blight (brown patch, large patch) | Rhizoctonia solani | Fungus |
| ryegrasses | Southern blight | Sclerotium rolfsii | Fungus |
| seashore paspalum | Dollar spot | various | Fungus |
| seashore paspalum | Spring dead spot | Ophiosphaerella korrae | Fungus |
| snapdragon | Leaf spot diseases | Phyllosticta spp. | 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 |
| st. augustine grass | Brown patch (large patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| st. augustine grass | Gray leaf spot | Pyriculria grisea | Fungus |
| st. augustine grass | Large patch (brown patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| st. augustine grass | Rhizoctonia blight (brown patch, large patch) | Rhizoctonia solani | Fungus |
| stone fruit | Armillaria root rot (Oak root fungus) | Armillaria mellea | Fungus |
| stone fruit | Brown rot | Monilinia spp. | Fungus |
| stone fruit | Cytospora canker | Cytospora spp. | Fungus |
| stone fruit | Oak root fungus (Armillaria root rot) | Armillaria mellea | Fungus |
| stone fruit | Phytophthora root and crown rot | Phytophthora spp. | Oomycete |
| strawberry | Angular leaf spot | Xanthamonas fragariae | Fungus |
| strawberry | Black root rot | various | Fungus |
| strawberry | Botrytis rot (gray mold) | Botrytis cinerea | Fungus |
| strawberry | Common leaf spot | Mycosphaerella fragariae | Fungus |
| strawberry | Common leaf spot | Ramularia tulasnei | Fungus |
| strawberry | Gray mold (Botrytis rot) | Botrytis cinerea | Fungus |
| strawberry | Leaf blotch | Gnomonia fragariae | Fungus |
| strawberry | Leaf blotch | Zythia fragariae | Fungus |
| strawberry | Leaf scorch | Diplocarpon earlianum | Fungus |
| strawberry | Leaf spot | various | Fungus |
| strawberry | Leaf spot, Angular | Xanthamonas fragariae | Fungus |
| strawberry | Leaf spot, Common | Mycosphaerella fragariae | Fungus |
| strawberry | Leaf spot, Common | Ramularia tulasnei | Fungus |
| strawberry | Leak (Rhizopus rot) | Rhizopus spp. | Fungus |
| strawberry | Phomopsis leaf blight | Phomopsis obscurans | Fungus |
| strawberry | Phytophthora root and crown rot (Red Stele) | Phytophthora spp. | Oomycete |
| strawberry | Powdery mildew | Sphaerotheca macularis | Fungus |
| strawberry | Red Stele (Phytophthora root and crown rot) | Phytophthora spp. | Oomycete |
| strawberry | Rhizopus rot (Leak) | Rhizopus spp. | Fungus |
| strawberry | Verticillium wilt | Verticillium dahliae | Fungus |
| strawberry | Viruses | none | Virus |
| sunflower | Powdery mildew | Golovinomyces cichoracearum | Fungus |
| sweet gum/liquidambar | Alcoholic flux (Foamy canker) | none | Unknown |
| sweet gum/liquidambar | Foamy canker (alcoholic flux) | none | Unknown |
| sweet pea | Ascochyta blight | Ascochyta lathyri | Fungus |
| sweet pea | Leaf spot, Ramularia | Ramularia deusta | Fungus |
| sweet pea | Ramularia leaf spot | Ramularia deusta | Fungus |
| sycamore | Anthracnose | Apiognomonia veneta | Fungus |
| sycamore | Canker stain (Ceratocystis canker) | Ceratocystis fimbriata | Fungus |
| sycamore | Ceratocystis canker (Canker stain) | Ceratocystis fimbriata | 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 | Tobacco mosaic virus  | Virus |
| tomato | Tomato spotted wilt | Tomato spotted wilt virus | Virus |
| tomato | Verticillium wilt | Verticillium dahliae | Fungus |
| tomato | White mold | Sclerotinia sclerotiorum | Fungus |
| transvaal daisy | Leaf spot diseases | Alternaria gerberae | Fungus |
| transvaal daisy | Leaf spot diseases | Ascochyta gerberae | Fungus |
| turnip | Powdery mildew | Erysiphe cruciferarum | Fungus |
| various flowers | Armillaria root rot | Armillaria mellea | Fungus |
| various flowers | Aster yellows | Aster yellows MLO | Phytoplasma |
| various flowers | Bacterial soft rots, leaf spots, blights, wilts | Xanthomonas spp. | Bacteria |
| various flowers | Botrytis blight (Gray mold) | Botrytis cinerea | Fungus |
| various flowers | Crown gall | Agrobacterium tumefaciens | Bacteria |
| various flowers | Downy mildew | Plasmopara (syn. Peronospora) spp. | Oomycete |
| various flowers | Fasciation | none | Bacteria |
| various flowers | Fusarium wilt | Fusarium oxysporum | Fungus |
| various flowers | Gray mold (Botrytis blight) | Botrytis cinerea | Fungus |
| various flowers | Leaf spot diseases | various | Fungus |
| various flowers | Root, stem, and crown rot | various | Fungus |
| various flowers | Rust | Puccinia spp. | Fungus |
| various flowers | Verticillium wilt | Verticillium albo-atrum | Fungus |
| various flowers | Viruses | none | Virus |
| various fruits and nuts | Alcoholic flux (Foamy canker) | na | Unknown |
| various fruits and nuts | Bacterial blight | Pseudomonas syringae | Bacteria |
| various fruits and nuts | Foamy canker (alcoholic flux) | na | Unknown |
| various fruits and nuts | Hairy root | Agrobacterium rhizogenes | Bacteria |
| various fruits and nuts | Sooty mold | various | Fungus |
| various fruits and nuts | Wood decay (general) | various | Fungus |
| various trees and shrubs | Anthracnose | various | Fungus |
| various trees and shrubs | Artist's conk | Ganoderma applanatum | Fungus |
| various trees and shrubs | Bacterial blight | Pseudomonas syringae | Bacteria |
| various trees and shrubs | Botrytis blight (Gray mold) | Botrytis cinerea | Fungus |
| various trees and shrubs | Canker diseases | various | Fungus |
| various trees and shrubs | Collar, foot, root, and crown rot | Phytophthora spp. | Oomycete |
| various trees and shrubs | Common split gill | Schizophyllum commune | Fungus |
| various trees and shrubs | Crown gall | Agrobacterium tumefaciens | Bacteria |
| various trees and shrubs | Damping off diseases | Pythium spp. | Oomycete |
| various trees and shrubs | Damping off diseases | Rhizoctonia spp. | Oomycete |
| various trees and shrubs | Dematophora root rot (Rosellinia root rot) | Dematophora necatrix | Fungus |
| various trees and shrubs | Dematophora root rot (Rosellinia root rot) | Rosellinia necatrix | Fungus |
| various trees and shrubs | Entomosporium leaf spot | Entomosporium spp. | Fungus |
| various trees and shrubs | Fusarium wilt | Fusarium oxysporum | Fungus |
| various trees and shrubs | Gray mold (Botrytis blight) | Botrytis cinerea | Fungus |
| various trees and shrubs | Hairy root | Agrobacterium rhizogenes | Bacteria |
| various trees and shrubs | Hairy turkey tail | Trametes hirsuta | Fungus |
| various trees and shrubs | Leaf gall | Exobasidium spp. | Fungus |
| various trees and shrubs | Leaf spot diseases | various | Fungus |
| various trees and shrubs | Leaf spot, Entomosporium | Entomosporium spp. | Fungus |
| various trees and shrubs | Leaf spot, Septoria | Septoria spp. | Fungus |
| various trees and shrubs | Needle blight | various | Fungus |
| various trees and shrubs | Oak leaf blister (Taphrina leaf curl) | Taphrina spp. | Fungus |
| various trees and shrubs | Oyster mushroom | Pleurotus ostreatus | Fungus |
| various trees and shrubs | Parchment fungus | Stereum spp. | Fungus |
| various trees and shrubs | Powdery mildew | various | Fungus |
| various trees and shrubs | Rosellinia root rot (Dematophora root rot ) | Dematophora necatrix | Fungus |
| various trees and shrubs | Rosellinia root rot (Dematophora root rot ) | Rosellinia necatrix | Fungus |
| various trees and shrubs | Rust | various | Fungus |
| various trees and shrubs | Scab | various | Fungus |
| various trees and shrubs | Septoria leaf spot | Septoria spp. | Fungus |
| various trees and shrubs | Sooty mold | various | Fungus |
| various trees and shrubs | Stem cankers and dieback | various | Fungus |
| various trees and shrubs | Sudden oak death | Phytophthora ramorum | Oomycete |
| various trees and shrubs | Sulfur fungus | Laetiporus sulphureus | Fungus |
| various trees and shrubs | Taphrina leaf curl (Oak leaf blister) | Taphrina spp. | Fungus |
| various trees and shrubs | Turkey tail | Trametes versicolor | Fungus |
| various trees and shrubs | Varnish fungus rot | Ganoderma lucidum | Fungus |
| various trees and shrubs | Verticillium wilt | Verticillium spp. | Fungus |
| various trees and shrubs | Viruses | none | Virus |
| various trees and shrubs | Wetwood or slime flux | various | Bacteria |
| various trees and shrubs | Witches' broom | various | Fungus |
| various trees and shrubs | Wood decay (general) | various | 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 |
| verbena | Leaf spot diseases | Septoria verbenae | Fungus |
| violet | Leaf spot diseases | Alternaria spp. | Fungus |
| violet | Leaf spot diseases | Cercospora spp. | Fungus |
| walnut | Anthracnose | Gnomonia leptostyla | Fungus |
| walnut | Armillaria root rot (Oak root fungus) | Armillaria mellea | Fungus |
| walnut | Blackline | cherry leaf roll virus | Virus |
| walnut | Branch wilt | Hendersonula tortuloidea | Fungus |
| walnut | Common split gill | Schizophyllum commune | Fungus |
| walnut | Deep bark canker | Erwinia rubrifaciens | Bacteria |
| walnut | Hairy turkey tail | Trametes hirsuta | Fungus |
| walnut | Oak root fungus (Armillaria root rot) | Armillaria mellea | Fungus |
| walnut | Oyster mushroom | Pleurotus ostreatus | Fungus |
| walnut | Phytophthora root and crown rot | Phytophthora spp. | Oomycete |
| walnut | Shallow bark canker | Erwinia nigrifluens | Bacteria |
| walnut | Sulfur fungus | Laetiporus sulphureus | Fungus |
| walnut | Turkey tail | Trametes versicolor | Fungus |
| walnut | Walnut blight | Xanthamonas campestris | Bacteria |
| watermelon | Fusarium wilt | Fusarium oxysporum | Fungus |
| zinnia | Leaf spot diseases | Alternaria spp. | Fungus |
| zinnia | Leaf spot diseases | Phyllosticta zinniae | Fungus |
| zoysiagrass | Brown patch (large patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| zoysiagrass | Dollar spot | various | Fungus |
| zoysiagrass | Fusarium patch (Microdochium patch or pink snow mold) | Microdochium nivale | Fungus |
| zoysiagrass | Large patch (brown patch or Rhizoctonia blight ) | Rhizoctonia solani | Fungus |
| zoysiagrass | Leaf spot | Bipolaris spp. | Fungus |
| zoysiagrass | Microdochium patch (Fusarium patch or pink snow mold) | Microdochium nivale | Fungus |
| zoysiagrass | Pink snow mold (Microdochium patch or Fusarium patch) | Microdochium nivale | Fungus |
| zoysiagrass | Rhizoctonia blight (brown patch, large patch) | Rhizoctonia solani | Fungus |
| zoysiagrass | Spring dead spot | Ophiosphaerella korrae | Fungus |
