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

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Forage Crops

No New Diseases

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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

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Herbaceous Ornamentals

No New Diseases

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Houseplants

No New Diseases

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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

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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

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Specialty Crops

No New Diseases

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Miscellaneous

No New Entries

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