Return to Home Page

Integrated Pest Management · Agriculture and Natural Resources

University of California

All plant diseases

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)

Descending = Ascending  Ascending= Descending  Unsorted= Unsorted

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 none Virus
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) none 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) none 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 virus none 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 none 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 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
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 na 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 virus none Virus
tomato Tomato spotted wilt virus none 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 none 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