Wisconsin Disease Almanac – June 20, 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 June 14, 2025 through June 20, 2025.

 

 


Broad-Leafed Woody Ornamentals Icon

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 Icon

Field Crops

No New Diseases

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Forage Crops Icon

Forage Crops

No New Diseases

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Fruit Crops Icon

Fruit Crops

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

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Herbaceous Ornamentals Icon

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 Icon

Houseplants

No New Diseases

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Needled Woody Ornamentals Icon

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 Icon

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 Icon

Specialty Crops

No New Diseases

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Miscellaneous Icon

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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