Compiled by Brian Hudelson and Hulubanche Kassa

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from May 23, 2026 through May 29, 2026.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Boxwood
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
County:  Milwaukee

Plant:  Boxwood
Disease/Disorder:  Fusarium Canker
Pathogen:  Fusarium sp.
Counties:  Dane, Waukesha

Plant:  Boxwood
Disease/Disorder:  Volutella Canker
Pathogen:  Volutella sp.
Counties:  Dane, Milwaukee, Waukesha

Plant:  Ironwood
Disease/Disorder:  Leaf Blister (Suspected)
Pathogen:  Taphrina virginica
County:  Milwaukee

Plant:  Lilac
Disease/Disorder:  Bacterial Blight
Pathogen:  Pseudomonas syringae pv. syringae
County:  Dane

Plant:  Maple (Norway)
Disease/Disorder:  Root/Crown Rot
Pathogens:  Phytophthora sp., Cylindrocarpon sp.
County:  Racine

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

Plant:  Maple (Red)
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
County:  Green

Plant:  Maple (Red)
Disease/Disorder:  Root/Crown Rot
Pathogen:  Phytophthora sp.
County:  Waukesha

Plant:  Maple (Red)
Disease/Disorder:  Verticillium Wilt
Pathogen:  Verticillium sp.
County:  Waukesha

Plant:  Oak (Unspecified)
Disease/Disorder:  Herbicide Damage
Pathogens:  None
County:  Monroe

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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:  Apple 
Disease/Disorder:  Botryosphaeria Canker
Pathogen:  Botryosphaeria sp.
County:  Dane

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

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

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

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Herbaceous Ornamentals

Plant:  Peony
Disease/Disorder:  Xanthomonas Blight
Pathogens:  Xanthomonas sp.
County:  Dane

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Houseplants

No New Diseases

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Needled Woody Ornamentals

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

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

Plant:  Spruce (Unspecified)
Disease/Disorder:  Root/Crown Rot
Pathogen:  Pythium sp.
County:  La Crosse

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Vegetable Crops

Plant:  Potato
Disease/Disorder:  Black Leg
Pathogens:  Dickeya dianthicola, Pectobacterium sp.
County:  Waushara

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Specialty Crops

No New Diseases

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Miscellaneous

No New Entries

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