Wisconsin Disease Almanac – August 22, 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 16, 2025 through August 22, 2025.

 

 


Broad-Leafed Woody Ornamentals Icon

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 Icon

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 Icon

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 Icon

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 Icon

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 Icon

Houseplants

No New Diseases

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Needled Woody Ornamentals Icon

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 Icon

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 Icon

Specialty Crops

No New Diseases

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Miscellaneous Icon

Miscellaneous

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

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