Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from August 16, 2025 through August 22, 2025.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Beech (American)
Disease/Disorder:  Chlorosis
Pathogen:  None
County:  Milwaukee

Plant:  Birch (Gray)
Disease/Disorder:  Chlorosis
Pathogen:  None
County:  Dane

Plant:  Oak (Bur)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Dane

Plant:  Oak (Bur)
Disease/Disorder:  Tubakia Leaf Spot
Pathogen:  Tubakia dryina
County:  Dane

Plant:  Oak (White)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Dane

Plant:  Oak (White)
Disease/Disorder:  Chlorosis
Pathogen:  None
County:  Dane

Plant:  Oak (White)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Dane

Plant:  Oak (White)
Disease/Disorder:  Tubakia Leaf Spot
Pathogen:  Tubakia dryina
County:  Dane

Plant:  Oak (Unspecified)
Disease/Disorder: Chlorosis
Pathogen:  None
County:  Door

Plant:  Oak (Unspecified)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
Counties:  Marathon, Sauk

Plant:  Pear (Callery)
Disease/Disorder:  Botryosphaeria Canker
Pathogen:  Botryosphaeria sp.
County:  Dane

Plant:  Pear (Callery)
Disease/Disorder:  Fire Blight
Pathogen:  Erwinia amylovora
County:  Dane

Plant:  Serviceberry
Disease/Disorder:  Chlorosis
Pathogen:  None
County:  Dane

Plant:  Serviceberry
Disease/Disorder:  Powdery Mildew
Pathogen:  Oidium sp.
County:  Dane

Plant:  Smokebush
Disease/Disorder:  Verticillium Wilt
Pathogen:  Verticillium sp.
County:  Dane

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Field Crops

Plant:  Corn (Field)
Disease/Disorder:  Southern Corn Rust
Pathogen:  Puccinia polysora
Counties:  Columbia, Grant, Iowa, Rock

Plant:  Corn (Field)
Disease/Disorder:  Tar Spot
Pathogen:  Phyllachora maydis
Counties:  Columbia, Grant, Iowa, Rock

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Forage Crops

Plant:  Alfalfa
Disease/Disorder:  Root Rot
Pathogen:  Aphanomyces euteiches, Phytophthora sp., Pythium sp., Rhizoctonia sp., Fusarium sp.
County:  Manitowoc

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Fruit Crops

Plant:  Cranberry
Disease/Disorder:  Bitter Rot
Pathogen:  Colletotrichum gloeosporioides/Glomerella cingulata
County:  Monroe

Plant:  Grape
Disease/Disorder:  Black Rot
Pathogen:  Phyllosticta ampelicida
County:  Dane

Plant:  Grape
Disease/Disorder:  Powdery Mildew
Pathogen:  Oidium sp.
County:  Dane

Plant:  Grape
Disease/Disorder:  Sour Rot
Pathogen:  Miscellaneous yeasts
County:  Dane

Plant:  Peach
Disease/Disorder:  Bacterial Canker
Pathogen:  Pseudomonas syringae
County:  Dane

Plant:  Peach
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
County:  Dane

Plant:  Raspberry
Disease/Disorder:  Root/Crown Rot
Pathogens:  Phytophthora sp., Rhizoctonia sp.
County:  Dane

Plant:  Strawberry
Disease/Disorder:  Root/Crown Rot
Pathogen:  Rhizoctonia sp.
County:  Dane

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Herbaceous Ornamentals

Plant:  Amaranth
Disease/Disorder:  Root/Crown Rot
Pathogen:  Pythium sp.
County:  Vernon

Plant:  Gaillardia
Disease/Disorder:  Aster Yellows (Suspected)
Pathogen:  Aster Yellows Phytoplasma
County:  Dane

Plant:  Hosta
Disease/Disorder:  Root/Crown Rot
Pathogen:  Fusarium oxysporum
County:  Waukesha

Plant:  Phlox
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum sp. 
Counties:  Bayfield, Brown

Plant:  Phlox
Disease/Disorder:  Powdery Mildew
Pathogen:  Oidium sp. 
County:  Brown

Plant:  Sunpatiens
Disease/Disorder:  Herbicide Damage (Suspected)
Pathogen:  None
County:  Brown

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Houseplants

No New Diseases

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Needled Woody Ornamentals

Plant:  Arborvitae
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Milwaukee

Plant:  Juniper
Disease/Disorder:  Winter Burn
Pathogen:  None
County:  Waukesha

Plant:  Larch (Unspecified)
Disease/Disorder:  Larch Needle Cast
Pathogen:  Mycosphaerella laricina
County:  Dane

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Vegetable Crops

Plant:  Broccoli
Disease/Disorder:  Root Rot
Pathogen:  Pythium sp., Phytophthora sp., Fusarium oxysporum
County:  Milwaukee

Plant:  Cabbage (Napa)
Disease/Disorder:  Head Rot
Pathogen:  Rhizoctonia sp., Phytophthora sp.
County:  Milwaukee

Plant:  Corn (Sweet)
Disease/Disorder:  Gray Leaf Spot
Pathogen:  Cercospora sp.
County:  Door

Plant:  Kale
Disease/Disorder:  Root Rot
Pathogen:  Pythium sp., Phytophthora sp., Fusarium sp.
County:  Milwaukee

Plant:  Pepper
Disease/Disorder:  Root Rot
Pathogen:  Pythium sp., Phytophthora sp., Fusarium sp.
County:  Milwaukee

Plant:  Potato
Disease/Disorder:  Black Leg
Pathogen:  Pectobacterium carotovorum subsp. carotovorum
County:  Waushara

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Specialty Crops

No New Diseases

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Miscellaneous

Mushroom ID:  Jack O’Lantern Mushroom (Omphalotus illudens) 
County:  Dane

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from August 9, 2025 through August 15, 2025.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Aspen 
Disease/Disorder:  Marssonina Leaf Spot and Blight
Pathogen:  Marssonina sp.
County:  Dane

Plant:  Cherry (Black)
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
County:  Dane

Plant:  Crabapple 
Disease/Disorder:  Sphaeropsis Canker
Pathogen:  Sphaeropsis sp.
County:  Dane

Plant:  Lilac (Unspecified)
Disease/Disorder:  Verticillium Wilt
Pathogen:  Verticillium sp.
County:  Waukesha

Plant:  Maple (Unspecified)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Jefferson

Plant:  Maple (Unspecified)
Disease/Disorder:  Melanconis Canker
Pathogen:  Melanconis sp.
County:  Dane

Plant:  Maple (Unspecified)
Disease/Disorder:  Sunburn
Pathogen:  None
County:  Jefferson

Plant:  Ninebark
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum sp.
County:  Crawford

Plant:  Ninebark
Disease/Disorder:  Cercospora Leaf Spot
Pathogen:  Cercospora sp.
County:  Crawford

Plant:  Oak (Bur)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Dane

Plant:  Oak (White)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
Counties:  Dane, Lake (IL)

Plant:  Oak (White)
Disease/Disorder:  Chlorosis
Pathogen:  None
Counties:  Dane, Lake (IL)

Plant:  Oak (White)
Disease/Disorder:  Monochaetia Leaf Spot
Pathogen:  Monochaetia sp.
County:  Lake (IL)

Plant:  Oak (White)
Disease/Disorder:  Tubakia Leaf Spot
Pathogen:  Tubakia dryina
Counties:  Dane, Lake (IL)

Plant:  Oak (Unspecified)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Winnebago

Plant:  Oak (Unspecified)
Disease/Disorder: Chlorosis
Pathogen:  None
County:  Winnebago

Plant:  Oak (Unspecified)
Disease/Disorder:  Monochaetia Leaf Spot
Pathogen:  Monochaetia sp.
County:  Winnebago

Plant:  Oak (Unspecified)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
Counties:  Dane, Marathon

Plant:  Oak (Unspecified)
Disease/Disorder:  Smooth Patch
Pathogen:  None
County:  Dane

Plant:  Oak (Unspecified)
Disease/Disorder:  Tubakia Leaf Spot
Pathogen:  Tubakia dryina
County:  Winnebago

Plant:  Ohio Buckeye
Disease/Disorder:  Edema
Pathogen:  None
County:  Dane

Plant:  Redbud
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
County:  Dane

Plant:  Sumac (Fragrant)
Disease/Disorder:  Fusarium Wilt
Pathogen:  Fusarium sp.
County:  Waukesha

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Field Crops

Plant:  Corn (Field)
Disease/Disorder:  Southern Corn Rust
Pathogen:  Puccinia polysora
Counties:  Brown, Outagamie

Plant:  Wheat
Disease/Disorder:  Head Weathering
Pathogen:  Miscellaneous fungi
County:  Sheboygan

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Forage Crops

Plant:  Alfalfa
Disease/Disorder:  Bacterial Wilt
Pathogen:  Clavibacter michiganensis subsp. insidiosus
County:  Manitowoc

Plant:  Alfalfa
Disease/Disorder:  Root Rot
Pathogen:  Rhizoctonia sp., Fusarium sp.
County:  Manitowoc

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Fruit Crops

Plant:  Blueberry
Disease/Disorder: Chlorosis
Pathogen:  None
County:  St. Croix

Plant:  Blueberry
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  St. Croix

Plant:  Blueberry
Disease/Disorder:  Transplant Shock (Suspected)
Pathogen:  None
County:  Dane

Plant:  Grape
Disease/Disorder:  Black Rot
Pathogen:  Phyllosticta ampelicida
County:  Dane

Plant:  Plum
Disease/Disorder:  Black Knot
Pathogen:  Apiosporina morbosa
County:  Iowa

Plant:  Strawberry
Disease/Disorder:  Root/Crown Rot
Pathogens:  Phytophthora sp., Rhizoctonia sp.
County:  St. Croix

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Herbaceous Ornamentals

Plant:  Coral Bells
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum sp.
County:  Boone (IL)

Plant:  Hibiscus
Disease/Disorder:  Herbicide Damage
Pathogen:  None
County:  Boone (IL)

Plant:  Veronica
Disease/Disorder:  Septoria Leaf Spot
Pathogen:  Septoria sp. 
County:  Winnebago

Plant:  Zinnia
Disease/Disorder:  Bacterial Leaf Spot
Pathogen:  Xanthomonas campestris pv. zinniae
County:  Bayfield

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Houseplants

No New Diseases

(Back To Menu)

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Needled Woody Ornamentals

Plant:  Juniper
Disease/Disorder:  Diplodia Shoot Blight and Canker
Pathogen:  Diplodia sp.
County:  Waukesha

Plant:  Juniper
Disease/Disorder:  Winter Burn
Pathogen:  None
County:  Jefferson

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Vegetable Crops

Plant:  Asparagus
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Waushara

Plant:  Asparagus
Disease/Disorder:  Root Rot
Pathogen:  Fusarium sp.
County:  Waushara

Plant:  Cucumber
Disease/Disorder:  Alternaria Leaf Spot
Pathogen:  Alternaria sp.
County:  Adams

Plant:  Cucumber
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum orbiculare
County:  Adams

Plant:  Snap Bean
Disease/Disorder:  Root Rot
Pathogens:  Aphanomyces sp., Fusarium sp.
County:  Oconto

Plant:  Snap Bean
Disease/Disorder:  Halo Blight
Pathogen:  Pseudomonas savastanoi pv. phaseolicola
County:  Manitowoc

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Specialty Crops

No New Diseases

(Back To Menu)

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Miscellaneous

No New Entries

(Back To Menu)

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from August 2, 2025 through August 8, 2025.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Aspen (Quaking)
Disease/Disorder:  Venturia Leaf and Shoot Blight
Pathogen:  Venturia morelettii
County:  Dane

Plant:  Beech 
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
County:  Ozaukee

Plant:  Beech 
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Ozaukee

Plant:  Boxwood 
Disease/Disorder:  Volutella Canker
Pathogen:  Volutella sp.
County:  Dane

Plant:  Catalpa
Disease/Disorder:  Verticillium Wilt
Pathogen:  Verticillium sp.
County:  Dane

Plant:  Elm (American)
Disease/Disorder:  Dutch Elm Disease
Pathogen:  Ophiostoma sp.
County:  Dane

Plant:  Hydrangea
Disease/Disorder:  Girdling (from attached strings)
Pathogen:  None
County:  Door

Plant:  Hydrangea
Disease/Disorder:  Root Rot
Pathogen:  Phytophthora sp.
County:  Sawyer

Plant:  Lilac
Disease/Disorder:  Root Rot
Pathogen:  Phytophthora sp.
County:  Sawyer

Plant:  Lilac
Disease/Disorder:  Verticillium Wilt (Suspected)
Pathogen:  Verticillium sp.
County:  Dodge

Plant:  Magnolia
Disease/Disorder:  Root Rot
Pathogen:  Rhizoctonia sp.
County:  Dane

Plant:  Maple (Unspecified)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  La Crosse

Plant:  Maple (Unspecified)
Disease/Disorder:  Steganosporium Canker
Pathogen:  Steganosporium sp.
County:  Waukesha

Plant:  Ninebark
Disease/Disorder:  Powdery Mildew
Pathogen:  Oidium sp.
County:  Dane

Plant:  Oak (Swamp White)
Disease/Disorder:  Chlorosis
Pathogen:  None
County:  Dane

Plant:  Oak (White)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Dane

Plant:  Oak (White)
Disease/Disorder:  Tubakia Leaf Spot
Pathogen:  Tubakia dryina
County:  Dane

Plant:  Oak (White)
Disease/Disorder:  White Rot
Pathogen:  Irpex lacteus
County:  Dane

Plant:  Rose
Disease/Disorder:  Anthracnose
Pathogen:  Gloeosporium sp.
County:  Sawyer

Plant:  Rose
Disease/Disorder:  Gray Mold (Botrytis Blight)
Pathogen:  Botrytis cinerea
County:  Sawyer

Plant:  Rose
Disease/Disorder:  Root Rot
Pathogen:  Phytophthora sp.
County:  Sawyer

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Field Crops

Plant:  Corn (Field)
Disease/Disorder:  Southern Corn Rust
Pathogen:  Puccinia polysora
Counties:  Grant, Green, Green Lake

(Back To Menu)

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Forage Crops

No New Diseases

(Back To Menu)

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Fruit Crops

Plant:  Apple
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
Counties:  Waupaca, Wood

Plant:  Apple
Disease/Disorder:  Root Rot
Pathogen:  Phytophthora sp.
County:  Wood

Plant:  Apple
Disease/Disorder:  Marssonina Leaf Blotch
Pathogen:  Marssonina coronaria
County:  Dunn

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Herbaceous Ornamentals

Plant:  Hosta
Disease/Disorder:  Southern Blight
Pathogen:  Athelia rolfsii
County:  Columbia

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Houseplants

No New Diseases

(Back To Menu)

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Needled Woody Ornamentals

Plant:  Arborvitae
Disease/Disorder:  Cytospora Canker
Pathogen:  Cytospora sp.
County:  Door

Plant:  Arborvitae
Disease/Disorder:  Root Rot
Pathogens:  Phytophthora sp., Pythium sp., Fusarium sp.
Counties:  Dane, Racine

Plant:  Arborvitae
Disease/Disorder:  Sphaeropsis Canker
Pathogen:  Sphaeropsis sp.
County:  Dane

Plant:  Fir (Balsam)
Disease/Disorder:  Cytospora Canker
Pathogen:  Cytospora sp.
County:  Waukesha

Plant:  Juniper
Disease/Disorder:  Winter Burn
Pathogen:  None
County:  Dane

Plant:  Larch (Unspecified)
Disease/Disorder:  Herbicide Damage (Suspected)
Pathogen:  None
County:  Washington

Plant:  Spruce (Bird’s Nest)
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Dane

Plant:  Spruce (Norway)
Disease/Disorder:  Transplant Shock (Suspected)
Pathogen:  None
County:  Waukesha

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Vegetable Crops

Plant:  Cucumber
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum orbiculare
County:  Manitowoc

Plant:  Onion
Disease/Disorder:  Stemphylium Leaf Blight
Pathogen:  Stemphylium sp.
County:  Waushara

Plant:  Pepper
Disease/Disorder:  Bacterial Spot
Pathogen:  Xanthomonas sp.
County:  Iowa

Plant:  Potato
Disease/Disorder:  Foliar Blight
Pathogen:  Phytophthora nicotianae
County:  Adams

Plant:  Tomato
Disease/Disorder:  Walnut Toxicity (Suspected)
Pathogen:  None
County:  Dane

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Specialty Crops

No New Diseases

(Back To Menu)

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Miscellaneous

Mushroom ID:  Glistening Inky Cap (Coprinellus micaceus) 
County:  Walworth

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from July 26, 2025 through August 1, 2025.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Beech (Weeping)
Disease/Disorder:  Root Rot
Pathogen:  Pythium sp.
County:  Waukesha

Plant:  Chokeberry
Disease/Disorder:  Root Rot
Pathogen:  Phytophthora sp.
County:  Waukesha

Plant:  Dogwood (Pagoda)
Disease/Disorder:  Golden Canker
Pathogen:  Cryptodiaporthe corni
County:  Dane

Plant:  Ginkgo
Disease/Disorder:  Root Rot
Pathogens:  Phytophthora sp., Fusarium sp.
County:  Portage

Plant:  Honeysuckle (Dwarf Bush)
Disease/Disorder:  Fusarium Canker
Pathogen:  Fusarium sp.
County:  Waukesha

Plant:  Kentucky Coffee Tree
Disease/Disorder:  Root Rot
Pathogen:  Fusarium sp.
County:  Dane

Plant:  Maple (Unspecified)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Green

Plant:  Maple (Unspecified)
Disease/Disorder:  Chlorosis
Pathogen:  None
County:  Milwaukee

Plant:  Maple (Unspecified)
Disease/Disorder:  Lichens
Pathogen:  None
County:  Milwaukee

Plant:  Maple (Unspecified)
Disease/Disorder:  Sunburn
Pathogen:  None
County:  Waukesha

Plant:  Oak (Bur)
Disease/Disorder:  Chlorosis
Pathogen:  None
County:  Dane

Plant:  Oak (Unspecified)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Winong (MN)

Plant:  Spirea
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum sp.
County:  Waukesha

Plant:  Willow
Disease/Disorder:  Anthracnose
Pathogen:  Monostichella salicis
County:  St. Croix

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Field Crops

Plant:  Mint
Disease/Disorder:  Root Rot
Pathogen:  Rhizoctonia sp.
County:  Rock

Plant:  Soybean
Disease/Disorder:  Charcoal Rot
Pathogen:  Macrophomina phaseolina
County:  Dane

Plant:  Soybean
Disease/Disorder:  Fusarium Root Rot
Pathogen:  Fusarium sp.
Counties:  Dane, Oneida

Plant:  Soybean
Disease/Disorder:  Phytophthora Root and Stem Rot
Pathogen:  Phytophthora sp.
County:  Oneida

(Back To Menu)

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Forage Crops

No New Diseases

(Back To Menu)

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Fruit Crops

Plant:  Apple
Disease/Disorder:  Cytospora Canker
Pathogen:  Cytospora sp.
County:  Dane

Plant:  Apple
Disease/Disorder:  Chemical Burn
Pathogen:  None
County:  Dane

Plant:  Apple
Disease/Disorder:  Root Rot
Pathogen:  Cylindrocarpon sp.
County:  Dane

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Herbaceous Ornamentals

Plant:  Ginger (European)
Disease/Disorder:  White Mold
Pathogen:  Sclerotinia sclerotiorum
County:  Waukesha

Plant:  Hosta
Disease/Disorder:  Cucumber Mosaic
Pathogen:  Cucumber mosaic virus
County:  Racine

Plant:  Hosta
Disease/Disorder:  Hosta Virus X
Pathogen:  Hosta virus X
County:  Racine

Plant:  Hosta
Disease/Disorder:  Southern Blight
Pathogen:  Athelia rolfsii
County:  Dane

(Back To Menu)

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Houseplants

No New Diseases

(Back To Menu)

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Needled Woody Ornamentals

Plant:  Juniper
Disease/Disorder:  Diplodia Shoot Blight and Canker
Pathogen:  Diplodia sp.
County:  Manitowoc

Plant:  Pine (Limber)
Disease/Disorder:  Diplodia Shoot Blight and Canker
Pathogen:  Diplodia sp.
County:  Waukesha

Plant:  Spruce (Unspecified)
Disease/Disorder:  Cytospora Canker
Pathogen:  Cytospora sp.
County:  Waukesha

Plant:  Spruce (Unspecified)
Disease/Disorder:  Fertility Issues (Suspected)
Pathogen:  None
County:  Los Angeles (CA)

Plant:  Spruce (Unspecified)
Disease/Disorder:  Herbicide Damage (Suspected)
Pathogen:  None
County:  Ozaukee

Plant:  Spruce (Unspecified)
Disease/Disorder:  Winter Burn (Suspected)
Pathogen:  None
County:  Waukesha

Plant:  Yew
Disease/Disorder:  Root Rot
Pathogens:  Phytophthora sp., Pythium sp.
County:  Ozaukee

Plant:  Yew
Disease/Disorder:  Twig Blight
Pathogen:  Phyllosticta sp.
Counties:  Dane, Ozaukee

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Vegetable Crops

Plant:  Cabbage
Disease/Disorder:  Basil Stem Rot
Pathogen:  Rhizoctonia sp.
County:  Dane

Plant:  Cabbage
Disease/Disorder:  Black Rot
Pathogen:  Xanthomonas campestris pv. campestris
County:  Dane

Plant:  Celery
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum sp.
County:  Waushara

Plant:  Cucumber
Disease/Disorder:  Anthracnose (Suspected)
Pathogen:  Colletotrichum orbiculare
County:  Portage

Plant:  Onion
Disease/Disorder:  Dog Vomit Slime Mold
Pathogen:  None
County:  Douglas

Plant:  Pepper
Disease/Disorder:  Charcoal Rot
Pathogen:  Macrophomina phaseolina
County:  Racine

Plant:  Pepper
Disease/Disorder:  Root Rot
Pathogen:  Pythium sp.
County:  Racine

Plant:  Tomato
Disease/Disorder:  Blossom End Rot
Pathogen:  None
County:  Brown

Plant:  Tomato
Disease/Disorder:  Catface
Pathogen:  None
County:  Brown

Plant:  Tomato
Disease/Disorder:  Herbicide Damage (Suspected)
Pathogen:  None
County:  Brown

Plant:  Tomato
Disease/Disorder:  Root Rot
Pathogen:  Pythium sp.
County:  Racine

(Back To Menu)

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Specialty Crops

No New Diseases

(Back To Menu)

---

Miscellaneous

No New Entries

(Back To Menu)

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from July 19, 2025 through July 25, 2025.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Boxwood
Disease/Disorder:  Volutella Canker
Pathogen:  Volutella sp.
County:  Kenosha

Plant:  Buckeye (Red)
Disease/Disorder:  Frost Crack
Pathogen:  None
County:  Waukesha

Plant:  Crabapple
Disease/Disorder:  Sphaeropsis Canker
Pathogen:  Sphaeropsis sp.
County:  Dane

Plant:  Maple
Disease/Disorder:  Phytophthora Canker
Pathogen:  Phytophthora sp.
County:  Outagamie

Plant:  Maple (Korean)
Disease/Disorder:  Diplodia Canker
Pathogen:  Diplodia sp.
County:  Dane

Plant:  Oak (Bur)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Kenosha

Plant:  Oak (Unspecified)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Cook (IL)

Plant:  Oak (Unspecified)
Disease/Disorder:  Chlorosis
Pathogen:  None
Counties:  Dane, Pierce, Cook (IL)

Plant:  Oak (Unspecified)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Sauk

Plant:  Oak (Unspecified)
Disease/Disorder:  Tubakia Leaf Spot
Pathogen:  Tubakia dryina
County:  Cook (IL)

Plant:  Pear (Ornamental)
Disease/Disorder:  Fire Blight
Pathogen:  Erwinia amylovora
County:  Dane

Plant:  Pear (Ornamental)
Disease/Disorder:  Pear Trellis Rust (Suspected)
Pathogen:  Gymnosporangium sabinae
County:  Sheboygan

Plant:  Rose
Disease/Disorder:  Rose Rosette (Suspected)
Pathogen:  Rose rosette virus
County:  Milwaukee

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Field Crops

Plant:  Soybean
Disease/Disorder:  Soybean Cyst Nematode
Pathogen:  Heterodera glycines
County:  Outagamie

Plant:  Soybean
Disease/Disorder:  Sudden Death Syndrome
Pathogen:  Fusarium virguliforme
County:  Outagamie

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Forage Crops

No New Diseases

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Fruit Crops

Plant:  Cherry (Sweet)
Disease/Disorder:  Bacterial Canker
Pathogen:  Pseudomonas syringae
County:  Portage

Plant:  Cherry (Sweet)
Disease/Disorder:  Phyllosticta Leaf Spot
Pathogen:  Phyllosticta sp.
County:  Portage

Plant:  Cherry (Unspecified)
Disease/Disorder:  Brown Rot
Pathogen:  Monilinia fructicola
County:  Dane

Plant:  Grape (‘Concord’)
Disease/Disorder:   Herbicide Damage
Pathogen:  None
County:  Dane

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Herbaceous Ornamentals

Plant:  Aralia
Disease/Disorder:  Verticillium Wilt
Pathogen:  Verticillium sp.
County:  Dane

Plant:  Miscellaneous Herbaceous Ornamentals
Disease/Disorder:  Dog Vomit Slime Mold
Pathogen:  None
County:  Jackson

Plant:  Petunia
Disease/Disorder:  Root Rot
Pathogens:  Phytophthora sp., Rhizoctonia sp.
County:  Kenosha

Plant:  Zinnia
Disease/Disorder:  Virus Disease (Suspected)
Pathogen:  Unspecified virus
County:  Racine

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Houseplants

No New Diseases

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Needled Woody Ornamentals

Plant:  Arborvitae
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Dane

Plant:  Arborvitae
Disease/Disorder:  Root Rot
Pathogen:  Fusarium sp.
County:  Dane

Plant:  Fir (Korean)
Disease/Disorder:  Rhizosphaera Needle Cast
Pathogen:  Rhizosphaera sp.
County:  Dane

Plant:  Fir (Korean)
Disease/Disorder:  Root Rot
Pathogens:  Pythium sp., Fusarium sp.
County:  Dane

Plant:  Fir (Unspecified)
Disease/Disorder:  Root Rot
Pathogen:  Phytophthora sp.
County:  Marathon

Plant:  Spruce (Unspecified)
Disease/Disorder:  Cytospora Canker
Pathogen:  Cytospora sp.
County:  Dane

Plant:  Yew
Disease/Disorder:  Grade Change
Pathogen:  None
County:  Sheboygan

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Vegetable Crops

Plant:  Bean (Pole)
Disease/Disorder:  Fertility Issues (Suspected)
Pathogen:  None
County:  Walworth

Plant:  Onion
Disease/Disorder:  Bacterial Leaf Necrosis (Suspected)
Pathogen:  Pseudomonas marginalis
County:  Dane

Plant:  Pea
Disease/Disorder:  Root Rot
Pathogens:  Aphanomyces euteiches, Fusarium sp., Rhizoctonia sp., Phytophthora sp.
County:  Dodge

Plant:  Tomato
Disease/Disorder:  Septoria Leaf Spot
Pathogen:  Septoria lycopersici
County:  Walworth

Plant:  Watermelon
Disease/Disorder:  Virus Disease (Suspected)
Pathogen:  Unspecified virus
County:  St. Croix

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Specialty Crops

No New Diseases

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Miscellaneous

No New Entries

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from July 12, 2025 through July 18, 2025.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Birch (River)
Disease/Disorder:  Mouse Ear (Suspected)
Pathogen:  None (nickel deficiency)
County:  Door

Plant:  Catalpa
Disease/Disorder:  Verticillium Wilt
Pathogen:  Verticillium sp.
County:  Dane

Plant:  Crabapple
Disease/Disorder:  Apple Scab
Pathogen:  Venturia inaequalis
County:  Sheboygan

Plant:  Hawthorn
Disease/Disorder:  Cedar-Hawthorn Rust
Pathogen:  Gymnosporangium globosum
County:  Dane

Plant:  Hawthorn
Disease/Disorder:  Sphaeropsis Leaf Blight
Pathogen:  Sphaeropsis sp.
County:  Dane

Plant:  Oak (Bur)
Disease/Disorder:  Herbicide Damage
Pathogen:  None
County:  Dane

Plant:  Oak (Red)
Disease/Disorder:  Chlorosis
Pathogen:  None
Counties:  Door, Ozaukee

Plant:  Oak (Unspecified)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Kenosha

Plant:  Redbud
Disease/Disorder:  Chemical Burn (Suspected)
Pathogen:  None
County:  Waukesha

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Field Crops

Plant:  Corn 
Disease/Disorder:  Bacterial Stalk Rot
Pathogen:  Dickeya sp. (Dickeya dadantii suspected)
County:  Lafayette

Plant:  Soybean
Disease/Disorder:  Phytophthora Root and Stem Rot
Pathogen:  Phytophthora sp.
County:  Columbia

Plant:  Soybean
Disease/Disorder:  Stem Canker
Pathogen:  Diaporthe phaseolorum
County:  Columbia

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Forage Crops

No New Diseases

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Fruit Crops

Plant:  Apple
Disease/Disorder:  Apple Scab
Pathogen:  Venturia inaequalis
County:  Waushara

Plant:  Apple
Disease/Disorder:  Cedar-Apple Rust
Pathogen:  Gymnosporangium juniperi-virginianae
County:  Waushara

Plant:  Apple
Disease/Disorder:   Frogeye Leaf Spot
Pathogen:  Botryosphaeria obtusa
County:  Waushara

Plant:  Apple
Disease/Disorder:  Sphaeropsis Canker
Pathogen:  Spheropsis sp.
County:  Green Lake

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Herbaceous Ornamentals

Plant:  Peony
Disease/Disorder:  Tobacco Rattle (Suspected)
Pathogen:  Tobacco Rattle Virus
County:  Florence

Plant:  Phlox
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum sp.
County:  Milwaukee

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Houseplants

No New Diseases

(Back To Menu)

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Needled Woody Ornamentals

Plant:  Arborvitae
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Columbia

Plant:  Arborvitae
Disease/Disorder:  Winter Burn (Suspected)
Pathogen:  None
County:  Columbia

Plant:  Pine (Unspecified)
Disease/Disorder:  Root Rot
Pathogens:  Rhizoctonia sp., Cylindrocarpon sp.
County:  Juneau

Plant:  Spruce (Norway)
Disease/Disorder:  Herbicide Damage (Suspected)
Pathogen:  None
County:  Milwaukee

Plant:  Spruce (Unspecified)
Disease/Disorder:  Diplodia Shoot Blight and Canker
Pathogen:  Diplodia sp.
County:  Portage

Plant:  Spruce (Unspecified)
Disease/Disorder:  Rhizosphaera Needle Cast
Pathogen:  Rhizosphaera kalkhoffii
County:  Portage

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Vegetable Crops

Plant:  Onion
Disease/Disorder:  Alternaria Leaf Spot/Blight
Pathogen:  Alternaria sp.
County:  Lafayette

Plant:  Pea
Disease/Disorder:  Root Rot
Pathogens:  Aphanomyces euteiches, Pythium sp., Rhizoctonia sp., Phytophthora sp.
County:  Clark

Plant:  Potato
Disease/Disorder:  Aerial Stem Blight
Pathogen:  Pectobacterium carotovorum subsp. carotovorum
County:  Waushara

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Specialty Crops

No New Diseases

(Back To Menu)

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Miscellaneous

No New Entries

(Back To Menu)

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from July 5, 2025 through July 11, 2025.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Boxwood
Disease/Disorder:  Fusasrium Canker
Pathogen:  Fusarium sp.
County:  Waukesha

Plant:  Boxwood
Disease/Disorder:  Volutella Canker
Pathogen:  Volutella sp.
County:  Waukesha

Plant:  Honey Locust
Disease/Disorder:  Thyronectria Canker
Pathogen:  Thyronectria austroamericana
County:  Dane

Plant:  Lilac (Shrub)
Disease/Disorder:  Root Rot
Pathogen:  Rhizoctonia sp.
County:  La Crosse

Plant:  Maple (Silver)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Waukesha

Plant:  Maple (Silver)
Disease/Disorder:  Root Rot
Pathogen:  Fusarium sp.
County:  Waukesha

Plant:  Maple (Sugar)
Disease/Disorder:  Steganosporium Canker
Pathogen:  Steganosporium sp.
County:  Dane

Plant:  Oak (Bur)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Fond du Lac

Plant:  Oak (Bur)
Disease/Disorder:  Bur Oak Blight
Pathogen:  Tubakia iowensis
County:  Fond du Lac

Plant:  Oak (Bur)
Disease/Disorder:  Monochaetia Leaf Spot
Pathogen:  Monochaetia sp.
County:  Fond du Lac

Plant:  Oak (White)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Waukesha

Plant:  Oak (White)
Disease/Disorder:  Monochaetia Leaf Spot
Pathogen:  Monochaetia sp.
County:  Waukesha

Plant:  Oak (White)
Disease/Disorder:  Tubakia Leaf Spot
Pathogen:  Tubakia dryina
County:  Waukesha

Plant:  Oak (Unspecified)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Waukesha

Plant:  Oak (Unspecified)
Disease/Disorder:  Monochaetia Leaf Spot
Pathogen:  Monochaetia sp.
County:  Waukesha

Plant:  Serviceberry
Disease/Disorder:  Transplant Shock (Suspected)
Pathogen:  None
County:  Dane

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Field Crops

Plant:  Corn (Seed)
Disease/Disorder:  Root Rot
Pathogen:  Rhizoctonia sp.
County:  Lafayette

Plant:  Corn (Seed)
Disease/Disorder:  Yellow Leaf Blight
Pathogen:  Phyllosticta maydis
County:  Lafayette

Plant:  Soybean
Disease/Disorder:  Fusarium Blight
Pathogen:  Fusarium oxysporum
County:  Fillmore (MN)

Plant:  Wheat
Disease/Disorder:  Root Rot
Pathogens:  Rhizoctonia sp., Fusarium sp.
County:  Sauk

(Back To Menu)

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Forage Crops

No New Diseases

(Back To Menu)

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Fruit Crops

Plant:  Apple
Disease/Disorder:   Sphaeropsis Canker
Pathogen:  Sphaeropsis sp.
County:  Rock

Plant:  Hazelnut
Disease/Disorder:  Root Rot
Pathogen:  Fusarium sp.
County:  Sauk

Plant:  Peach
Disease/Disorder:  Nitrogen Deficiency (Suspected)
Pathogen:  None
County:  Racine

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Herbaceous Ornamentals

Plant:  Vinca
Disease/Disorder:  Root Rot
Pathogen:  Rhizoctonia sp.
County:  Dane

(Back To Menu)

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Houseplants

No New Diseases

(Back To Menu)

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Needled Woody Ornamentals

Plant:  Juniper
Disease/Disorder:  Phomopsis Tip Blight
Pathogen:  Phomopsis juniperovora
County:  Dane

Plant:  Spruce (Blue)
Disease/Disorder:  Improper Planting
Pathogen:  None
County:  Dane

Plant:  Spruce (Blue)
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Dane

Plant:  Spruce (Blue)
Disease/Disorder:  Water Stress
Pathogen:  None
County:  Dane

Plant:  Yew
Disease/Disorder:  Twig Blight
Pathogen:  Phyllosticta sp.
County:  Sheboygan

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Vegetable Crops

Plant:  Brussels Sprouts
Disease/Disorder:  Herbicide Damage (Suspected)
Pathogen:  None
County:  Sauk

Plant:  Cabbage
Disease/Disorder:  Black Rot
Pathogen:  Xanthomonas campestris pv. campestris
County:  Waushara

Plant:  Pea
Disease/Disorder:  Root Rot
Pathogens:  Aphanomyces euteiches, Fusarium sp., Rhizoctonia sp.
County:  Adams

Plant:  Potato
Disease/Disorder:  Powdery Scab
Pathogen:  Spongospora subterranea subsp. subterranea
County:  Adams

Plant:  Tomato
Disease/Disorder:  Septoria Leaf Spot
Pathogen:  Septoria lycopersici
County:  Milwaukee

(Back To Menu)

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Specialty Crops

No New Diseases

(Back To Menu)

---

Miscellaneous

No New Entries

(Back To Menu)

---

 

Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from June 28, 2025 through July 4, 2025.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Boxwood
Disease/Disorder:  Fusasrium Canker
Pathogen:  Fusarium sp.
County:  Waukesha

Plant:  Boxwood
Disease/Disorder:  Phyllosticta Leaf Spot
Pathogen:  Phyllosticta sp.
County:  Waukesha

Plant:  Boxwood
Disease/Disorder:  Volutella Canker
Pathogen:  Volutella sp.
Counties:  Calumet, Ozaukee, Waukesha

Plant:  Buckthorn (Fern Leaf)
Disease/Disorder:  Crown Rust
Pathogen:  Puccinia coronata
County:  Waukesha

Plant:  Cherry (Ornamental)
Disease/Disorder:  Bacterial Canker
Pathogen:  Pseudomonas syringae
County:  Milwaukee

Plant:  Crabapple
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
County:  Waukesha

Plant:  Crabapple
Disease/Disorder:  Sphaeropsis Canker
Pathogen:  Sphaeropsis sp.
County:  Waukesha

Plant:  Honey Locust 
Disease/Disorder:  Wood Rot 
Pathogen:  Unspecified wood rot fungus
County:  Dane

Plant:  Ninebark
Disease/Disorder:  Powdery Mildew
Pathogen:  Oidium sp.
County:  Crawford

Plant:  Oak (Bur)
Disease/Disorder:  Diplodia Canker
Pathogen:  Diplodia sp.
County:  Dane

Plant:  Oak (Red)
Disease/Disorder: Chlorosis
Pathogen:  None
County:  Dane

Plant:  Smokebush
Disease/Disorder:  Verticillium Wilt
Pathogen:  Verticillium sp.
County:  Waukesha

Plant:  Stewartia (Japanese)
Disease/Disorder:  Transplant Shock (Suspected)
Pathogen:  None
County:  Dane

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Field Crops

Plant:  Wild Rye (Virginia)
Disease/Disorder:  Stripe Smut
Pathogen:  Ustilago nunavutica
County:  Green

(Back To Menu)

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Forage Crops

No New Diseases

(Back To Menu)

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Fruit Crops

Plant:  Apple
Disease/Disorder:   Diplodia Canker
Pathogen:  Diplodia sp./Botryosphaeria sp.
County:  Jefferson

Plant:  Strawberry
Disease/Disorder: Root/Crown Rot
Pathogens:  Phytophthora sp., Fusarium sp.
County:  Marathon

(Back To Menu)

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Herbaceous Ornamentals

No New Diseases

(Back To Menu)

---

Houseplants

No New Diseases

(Back To Menu)

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Needled Woody Ornamentals

Plant:  Arborvitae
Disease/Disorder:  Phyllosticta Needle Blight
Pathogen:  Phyllosticta sp.
County:  Dane

Plant:  Arborvitae
Disease/Disorder:  Winter Burn (Suspected)
Pathogen:  None
County:  Dane

Plant:  Arborvitae (Golden)
Disease/Disorder:  Heat Stress (Suspected)
Pathogen:  None
County:  Dane

Plant:  Fir (Unspecified)
Disease/Disorder:  Cytospora Canker
Pathogen:  Cytospora sp.
County:  Dane

Plant:  Fir (Unspecified)
Disease/Disorder: Rhizosphaera Needle Cast
Pathogen:  Rhizosphaera sp.
County:  Dane

Plant:  Larch (Japanese)
Disease/Disorder: Girdling Damage (Cord)
Pathogen:  None
County:  Dane

Plant:  Pine (Unspecified)
Disease/Disorder:  Winter Burn (Suspected)
Pathogen:  None
County:  Waukesha

Plant:  Spruce (Blue)
Disease/Disorder:  Spruce Needle Drop
Pathogen:  Setomelanomma holmii
County:  Dane

Plant: Spruce (Blue)
Disease/Disorder:  Transplant Shock (Suspected)
Pathogen:  None
County:  Dane

(Back To Menu)

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Vegetable Crops

Plant:  Parsley
Disease/Disorder:  Bacterial Leaf Blight
Pathogen:  Xanthomonas sp.
County:  Fillmore (MN)

Plant:  Pepper
Disease/Disorder:  Chemical Burn (Suspected)
Pathogen:  None
County:  Milwaukee

Plant:  Watermelon
Disease/Disorder:  Rye Allelopathy (Suspected)
Pathogen:  None
County:  Milwaukee

(Back To Menu)

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Specialty Crops

No New Diseases

(Back To Menu)

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Miscellaneous

No New Entries

(Back To Menu)

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from June 21, 2025 through June 27, 2025.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Crabapple
Disease/Disorder:  Apple Scab
Pathogen:  Venturia inaequalis
Counties:  Dane, Waukesha

Plant:  Crabapple
Disease/Disorder:  Fire Blight
Pathogen:  Erwinia amylovora
County:  Buffalo

Plant:  Crabapple
Disease/Disorder:  Sphaeropsis Canker
Pathogen:  Sphaeropsis sp.
County:  Dane

Plant:  Maple (Unspecified)
Disease/Disorder:  Wood Rot (Suspected)
Pathogen:  Unspecified wood rot fungus
County:  Eau Claire

Plant:  Oak (Red)
Disease/Disorder:  Herbicide Damage
Pathogen:  None
County:  Dane

Plant:  Oak (Swamp White)
Disease/Disorder: Chlorosis
Pathogen:  None
County:  Dane

Plant:  Serviceberry
Disease/Disorder:  Cedar-Quince Rust
Pathogen:  Gymnosporangium clavipes
County:  Dane

(Back To Menu)

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Field Crops

No New Diseases

(Back To Menu)

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Forage Crops

No New Diseases

(Back To Menu)

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Fruit Crops

Plant:  Apple
Disease/Disorder:  Cytospora Canker
Pathogen:  Cytospora sp.
County:  Waupaca

Plant:  Apple
Disease/Disorder:  Fire Blight
Pathogen:  Erwinia amylovora
County:  Waupaca

Plant:  Apple
Disease/Disorder:  Fusarium Canker
Pathogen:  Fusarium sp.
County:  Waupaca

Plant:  Apple
Disease/Disorder:  Fire Blight
Pathogen:  Erwinia amylovora
County:  Waupaca

Plant:  Apple
Disease/Disorder:  Nectria Twig Blight
Pathogen:  Nectria sp./Tubercularia sp.
County:  Waupaca

Plant:  Apple
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
County:  Marathon

Plant:  Strawberry
Disease/Disorder:  Fusarium Wilt
Pathogen:  Fusarium oxysporum
County:  Eau Claire

Plant:  Cherry
Disease/Disorder:  Bacterial Canker
Pathogen:  Pseudomonas syringae
County:  Oneida

Plant:  Cherry
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
County:  Oneida

Plant:  Raspberry
Disease/Disorder:  Anthracnose
Pathogen:  Elsinoe necator
County:  Dodge

Plant:  Raspberry
Disease/Disorder:  Cane Blight
Pathogen:  Leptosphaeria coniothyrium
County:  Dodge

Plant:  Raspberry
Disease/Disorder:  Root Rot
Pathogen:  Cylindrocarpon sp.
County:  Dodge

(Back To Menu)

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Herbaceous Ornamentals

No New Diseases

(Back To Menu)

---

Houseplants

No New Diseases

(Back To Menu)

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Needled Woody Ornamentals

Plant:  Arborvitae
Disease/Disorder:  Phyllosticta Needle Blight
Pathogen:  Phyllosticta sp.
County:  Dane

Plant:  Arborvitae
Disease/Disorder:  Water Stress (Suspected)
Pathogen:  None
County:  Dane

Plant:  Juniper
Disease/Disorder:  Diplodia Shoot Blight and Canker
Pathogen:  Diplodia sp.
County:  Dane

Plant:  Juniper
Disease/Disorder:  Winter Burn (Suspected)
Pathogen:  None
County:  Waukesha

Plant:  Pine (Scots)
Disease/Disorder:  Diplodia Shoot Blight and Canker
Pathogen:  Diplodia sp.
County:  Fond du Lac

Plant:  Pine (Scots)
Disease/Disorder:  Pine-Oak Gall Rust
Pathogen:  Cronartium quercuum f. sp. banksianae
County:  Fond du Lac

Plant:  Pine (Scots)
Disease/Disorder:  Water Stress (Suspected)
Pathogen:  None
County:  Fond du Lac

Plant:  Pine (Swiss Stone)
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Dane

Plant:  Spruce (Unspecified)
Disease/Disorder:  Rhizosphaera Needle Cast
Pathogen:  Rhizosphaera kalkhoffii
County:  Dane

Plant: Spruce (Unspecified)
Disease/Disorder:  Winter Burn 
Pathogen:  None
County:  Door

(Back To Menu)

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Vegetable Crops

Plant:  Garlic
Disease/Disorder:  Aster Yellows
Pathogen:  Aster Yellows Phytoplasma
County:  Pierce

Plant:  Potato
Disease/Disorder:  Black Leg
Pathogens:  Pectobacterium carotovorum subsp. carotovorum, Pectobacterium parmentieri
County:  Carroll (IL)

Plant:  Tomato
Disease/Disorder:  Herbicide Damage
Pathogen:  None
County:  Outagamie

Plant:  Zucchini
Disease/Disorder:  Herbicide Damage
Pathogen:  None
County:  Outagamie

(Back To Menu)

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Specialty Crops

No New Diseases

(Back To Menu)

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Miscellaneous

Mushroom ID:  Glistening Inky Cap (Coprinellus micaceus) 
County: Eau Claire

Mushroom ID:  Scotch Bonnet (Marasmius oreades) 
County:  Waukesha

(Back To Menu)

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from June 14, 2025 through June 20, 2025.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Boxwood
Disease/Disorder:  Volutella Canker
Pathogen:  Volutella sp.
County:  Dane

Plant:  Buckthorn (Fern Leaf)
Disease/Disorder:  Crown Rust
Pathogen:  Puccinia coronata
County:  Dane

Plant:  Burning Bush
Disease/Disorder:  Herbicide Damage
Pathogen:  None
County:  Dane

Plant:  Cherry (Sand)
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
County:  Dane

Plant:  Crabapple
Disease/Disorder:  Apple Scab
Pathogen:  Venturia inaequalis
Counties:  Dane, Racine

Plant:  Crabapple
Disease/Disorder:  Chlorosis
Pathogen:  None
County:  Dane

Plant:  Crabapple
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Dane

Plant:  Elm (Unspecified)
Disease/Disorder:  Dutch Elm Disease
Pathogen:  Ophiostoma sp. 
County:  La Crosse

Plant:  Magnolia
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
County:  Dane

Plant:  Maple (Sugar)
Disease/Disorder:  Squirrel Damage
Pathogen:  None
County:  Washington

Plant:  Maple (Unspecified)
Disease/Disorder:  Root/Crown Rot
Pathogens:  Pythium sp., Fusarium sp.
County:  Waukesha

Plant:  Oak (Red)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Waukesha

Plant:  Oak (Red)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Columbia

Plant:  Oak (White)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Lake (IL)

Plant:  Oak (White)
Disease/Disorder:  Chlorosis
Pathogen:  None
County:  Lake (IL)

Plant:  Oak (White)
Disease/Disorder:  Tubakia Leaf Spot
Pathogen:  Tubakia dryina
County:  Lake (IL)

Plant:  Redbud
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
County:  Dane

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Field Crops

No New Diseases

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Forage Crops

No New Diseases

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Fruit Crops

Plant:  Plum
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
County:  Portage

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Herbaceous Ornamentals

Plant:  Hosta
Disease/Disorder:  Host Virus X (Suspected)
Pathogen:  Hosta virus X
County:  Milwaukee

Plant:  Monarda
Disease/Disorder:  Chemical Burn (Suspected)
Pathogen:  None
County:  Sawyer

Plant:  Pachysandra
Disease/Disorder:  Volutella Blight
Pathogen:  Volutella pachysandricola
County:  Milwaukee

Plant:  Peony
Disease/Disorder:  Root/Crown Rot
Pathogens:  Phytophthora sp., Rhizoctonia sp.
County:  Iowa

Plant:  Phlox
Disease/Disorder:  Chemical Burn (Suspected)
Pathogen:  None
County:  Sawyer

Plant:  St. John’s-Wort
Disease/Disorder:  Rust
Pathogen:  Melampsora hypericorum (Suspected)
County:  La Crosse

Plant:  Veronica
Disease/Disorder:  Chemical Burn (Suspected)
Pathogen:  None
County:  Sawyer

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Houseplants

No New Diseases

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Needled Woody Ornamentals

Plant:  Arborvitae
Disease/Disorder:  Winter Burn (Suspected)
Pathogen:  None
County:  Waukesha

Plant:  Fir (White)
Disease/Disorder:  Phyllosticta Needle Blight
Pathogen:  Phyllosticta sp.
County:  Dane

Plant:  Juniper
Disease/Disorder:  Cedar-Quince Rust
Pathogen:  Gymnosporangium clavipes
County:  Dane

Plant:  Juniper
Disease/Disorder:  Cytospora Canker
Pathogen:  Cytospora sp.
County:  Waukesha

Plant:  Juniper
Disease/Disorder:  Phomopsis Tip Blight
Pathogen:  Phomopsis juniperovora
County:  Dane

Plant:  Juniper
Disease/Disorder:  Stigmina Needle Blight
Pathogen:  Stigmina juniperina
County:  Waukesha

Plant:  Juniper
Disease/Disorder:  Winter Burn 
Pathogen:  None
County:  Waukesha

Plant:  Yew
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Waukesha

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Vegetable Crops

Plant:  Onion
Disease/Disorder:  Root Rot
Pathogen:  Pythium sp.
County:  Dodge

Plant:  Pea
Disease/Disorder:  Root Rot
Pathogens:  Aphanomyces euteiches, Fusarium sp., Pythium sp., Rhizoctonia sp. 
County:  Waushara

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Specialty Crops

No New Diseases

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Miscellaneous

Mushroom ID:  Dead Man’s Fingers (Xylaria polymorpha) 
County: Winnebago

Mushroom ID:  Varnish Shelf (Ganoderma sp.) 
County:  Winnebago

Mushroom ID:  Glistening Inky Cap (Coprinellus micaceus) 
County: Waukesha

Mushroom ID:  Woodland Inkcap (Coprinellus deliquescens) 
County:  Waukesha

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