Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from September 27, 2025 through October 3, 2025.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Crabapple
Disease/Disorder:  Sphaeropsis Canker
Pathogen:  Sphaeropsis sp.
County:  Dane

Plant:  Lilac
Disease/Disorder:  Septoria Leaf Spot
Pathogen:  Septoria sp.
County:  Walworth

Plant:  Oak (Bur)
Disease/Disorder:  Bur Oak Blight
Pathogen:  Tubakia iowensis
County:  Dane

Plant:  Oak (Unspecified)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Waukesha

Plant:  Oak (Unspecified)
Disease/Disorder: Chlorosis
Pathogen:  None
County:  Waukesha

Plant:  Oak (Unspecified)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Dane

Plant:  Oak (Unspecified)
Disease/Disorder:  Tubakia Leaf Spot
Pathogen:  Tubakia dryina
County:  Waukesha

Plant:  Rhododendron
Disease/Disorder:  Root Rot
Pathogens:  Phytophthora sp., Rhizoctonia sp., Cylindrocarpon sp.
Counties:  Dane, Milwaukee

Plant:  Rose
Disease/Disorder:  Cercospora Leaf Spot
Pathogen:  Cercospora rosicola
County:  Walworth

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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:  Grape
Disease/Disorder:  Black Rot
Pathogen:  Phyllosticta ampelicida
County:  Dane

Plant:  Grape
Disease/Disorder:  Sour Rot
Pathogen:  Miscellaneous yeasts
County:  Dane

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Herbaceous Ornamentals

Plant:  Sedum
Disease/Disorder: Anthracnose
Pathogen:  Colletotrichum sp.
County:  La Crosse

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Houseplants

No New Diseases

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Needled Woody Ornamentals

Plant:  Pine (White)
Disease/Disorder: Chlorosis
Pathogen:  None
County:  Dane

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Vegetable Crops

Plant:  Cauliflower
Disease/Disorder:  Alternaria Leaf Spot
Pathogen:  Alternaria brassicicola
County:  Dane

Plant:  Potato
Disease/Disorder:  Corky Ring Spot
Pathogen:  Tobacco rattle virus
County:  Pulaski (IN)

Plant:  Tomato
Disease/Disorder:  Septoria Leaf Spot
Pathogen:  Septoria lycopersici
County:  Milwaukee

Plant:  Tomato
Disease/Disorder:  Sour Rot
Pathogen:  Geotrichum candidum
County:  Milwaukee

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Specialty Crops

No New Diseases

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Miscellaneous

No New Entries

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