Compiled by Brian Hudelson and Hulubanche Kassa

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from May 9, 2026 through May15, 2026.

 

 

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Broad-Leafed Woody Ornamentals

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

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

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

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

Plant:  Oak (Red)
Disease/Disorder:  Transplant Shock
Pathogen:  None
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

Plant:  Apple 
Disease/Disorder:  Sphaeropsis Canker
Pathogen:  Sphaeropsis sp.
County:  Waukesha

Plant:  Currant (Black)
Disease/Disorder:  Septoria Leaf Spot
Pathogen:  Septoria ribis
County:  Iowa

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Herbaceous Ornamentals

Plant:  Dahlia
Disease/Disorder:  Dahlia Mosaic
Pathogens:  Dahlia mosaic virus
County:  Milwaukee

Plant:  Dahlia
Disease/Disorder:  Tomato Spotted Wilt
Pathogens:  Tomato spotted wilt virus
County:  Milwaukee

Plant:  Impatiens
Disease/Disorder:  Cucumber Mosaic
Pathogens:  Cucumber mosaic virus
County:  Dane

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Houseplants

No New Diseases

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Needled Woody Ornamentals

Plant:  Arborvitae
Disease/Disorder:  Rabbit Damage (Suspected)
Pathogens:  None
County:  Dane

Plant:  Fir (Fraser)
Disease/Disorder:  Root/Crown Rot
Pathogen:  Pythium sp.
County:  Lincoln

Plant:  Fir (Fraser)
Disease/Disorder:  Transplant Shock (Suspected)
Pathogen:  None
County:  Lincoln

Plant:  Fir (Fraser)
Disease/Disorder:  Winter Burn (Suspected)
Pathogen:  None
County:  Lincoln

Plant:  Juniper
Disease/Disorder:  Root/Crown Rot
Pathogen:  Phytophthora sp.
County:  Walworth

Plant:  Juniper
Disease/Disorder:  Sphaeropsis Canker
Pathogen:  Sphaeropsis sp.
County:  Walworth

Plant:  Spruce (Blue)
Disease/Disorder:  Rhizosphaera Needle Cast
Pathogen:  Rhizosphaera kalkhoffii
County:  Rock

Plant:  Spruce (Unspecified)
Disease/Disorder:  Cytospora Canker
Pathogen:  Cytospora sp.
County:  Waukesha

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

Plant:  Yew
Disease/Disorder:  Twig Blight
Pathogen:  Phyllosticta sp.
County:  Dane

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Vegetable Crops

Plant:  Potato
Disease/Disorder:  Black Leg
Pathogen:  Dickeya dianthicola
County:  Waushara

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Specialty Crops

No New Diseases

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Miscellaneous

No New Entries

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