Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from April 25, 2026 through May 1, 2026.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Boxwood
Disease/Disorder:  Cold Injury (Suspected)
Pathogen:  None
Counties:  Ozaukee, Waukesha

Plant:  Boxwood
Disease/Disorder:  Fusarium Canker
Pathogen:  Fusarium sp.
County:  Ozaukee

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

Plant:  Oak (Red)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
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:  Fire Blight
Pathogen:  Erwinia amylovora
County:  Waupaca

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

Plant:  Pear
Disease/Disorder:  Fire Blight
Pathogen:  Erwinia amylovora
County:  Waupaca

Plant:  Pear
Disease/Disorder:  Sphaeropsis Canker
Pathogen:  Sphaeropsis sp.
County:  Waupaca

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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:  Pine (Limber)
Disease/Disorder:  Dothistroma Needle Blight
Pathogen:  Dothistroma sp.
County:  Dane

Plant:  Pine (White)
Disease/Disorder: White Pine Blister Rust
Pathogen:  Cronartium ribicola
County:  Douglas

Plant:  Spruce
Disease/Disorder: Rhizosphaera Needle Cast
Pathogen:  Rhizosphaera kalkhoffii
County:  Sheboygan

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Vegetable Crops

Plant:  Carrot
Disease/Disorder:  Aster Yellows
Pathogen:  Aster yellows phytoplasma
County:  Dane

Plant:  Carrot
Disease/Disorder:  Fusarium Canker
Pathogen:  Fusarium sp.
County:  Dane

Plant:  Pepper (Bell)
Disease/Disorder:  Tomato Spotted Wilt
Pathogen:  Tomato spotted wilt virus
County:  Will (IL)

Plant:  Pepper (Cayenne)
Disease/Disorder:  Bacterial Spot
Pathogen:  Xanthomonas sp.
County:  Will (IL)

Plant:  Pepper (Cayenne)
Disease/Disorder:  Tomato Spotted Wilt
Pathogen:  Tomato spotted wilt virus
County:  Will (IL)

Plant:  Potato
Disease/Disorder:  Bacterial Soft Rot
Pathogens:  Pectobacterium carotovorum subsp. carotovorum, Pectobacterium parmentieri
County:  Marathon

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Specialty Crops

No New Diseases

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Miscellaneous

No New Entries

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