Compiled by Brian Hudelson and Hulubanche Kassa

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from August 1, 2026 through August 7, 2026.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Boxwood
Disease/Disorder:  Volutella Canker
Pathogen:  Volutella sp.
County:  Waukesha

Plant:  Lilac (Common)
Disease/Disorder:  Septoria Leaf Spot
Pathogen:  Septoria sp.
County:  Dane

Plant:  Oak (Red)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
Counties:  Dane, Columbia, Waukesha

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

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

Plant:  Oak (Unspecified)
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Dane

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Field Crops

No New Diseases

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Forage Crops

No New Diseases

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Fruit Crops

No New Diseases

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Herbaceous Ornamentals

Plant:  Chrysanthemum
Disease/Disorder:  Crown Gall
Pathogen:  Agrobacterium tumefaciens
County:  Marathon

Plant:  Chrysanthemum
Disease/Disorder:  Root Rot
Pathogen:  Fusarium sp.
County:  Marathon

Plant:  Grass (Unspecified)
Disease/Disorder:  Ergot
Pathogen:  Claviceps purpureum
County:  Jefferson

Plant:  Hosta
Disease/Disorder:  Hosta Virus X
Pathogen:  Hosta virus X
County:  Door

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Houseplants

No New Diseases

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Needled Woody Ornamentals

Plant:  Arborvitae
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Milwaukee

Plant:  Arborvitae
Disease/Disorder:  Root Rot
Pathogen:  Fusarium oxysporum
County:  Dane

Plant:  Spruce (Unspecified)
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Waupaca

Plant:  Spruce (Unspecified)
Disease/Disorder:  Rhizosphaera Needle Cast
Pathogen:  Rhizosphaera kalkhoffii
County:  Waupaca

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Vegetable Crops

Plant:  Cucumber
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum orbiculare
County:  Brown

Plant:  Pea
Disease/Disorder:  Fusarium Wilt
Pathogen:  Fusarium oxysporum
County:  Price

Plant:  Pea
Disease/Disorder:  Root Rot
Pathogen:  Rhizoctonia sp.
County:  Price

Plant:  Potato
Disease/Disorder:  Early Blight
Pathogen:  Alternaria solani
County:  Buffalo

Plant:  Pumpkin
Disease/Disorder:  Root Rot
Pathogen:  Rhizoctonia sp.
County:  Dane

Plant:  Tomato
Disease/Disorder:  Early Blight
Pathogen:  Alternaria solani
County:  Buffalo

Plant:  Tomato
Disease/Disorder:  Septoria Leaf Spot
Pathogen:  Septoria lycopersici
Counties:  Brown, Buffalo

Plant:  Watermelon
Disease/Disorder:  Cercospora Leaf Spot
Pathogen:  Cercospora sp.
County:  Vernon

Plant:  Watermelon
Disease/Disorder:  Cucumber Mosaic
Pathogen:  Cucumber mosaic virus
County:  Vernon

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Specialty Crops

No New Diseases

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Miscellaneous

No New Entries

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