Wisconsin Disease Almanac – August 15, 2025

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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.

 

 


Broad-Leafed Woody Ornamentals Icon

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 Icon

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 Icon

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 Icon

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 Icon

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 Icon

Houseplants

No New Diseases

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Needled Woody Ornamentals Icon

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 Icon

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 Icon

Specialty Crops

No New Diseases

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Miscellaneous Icon

Miscellaneous

No New Entries

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