Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from March 21, 2026 through March 27, 2026.

 

 

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Broad-Leafed Woody Ornamentals

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

Plant:  Boxwood
Disease/Disorder:  Winter Burn (Suspected)
Pathogen:  None
County:  Milwaukee

Plant:  Lilac
Disease/Disorder:  Septoria Leaf Spot (Suspected)
Pathogen:  Septoria sp.
County:  Waukesha

Plant:  Rose
Disease/Disorder:  Pythium Canker
Pathogen: Pythium sp.
County:  Columbia

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Field Crops

No New Diseases

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Forage Crops

No New Diseases

(Back To Menu)

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Fruit Crops

No New Diseases

(Back To Menu)

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Herbaceous Ornamentals

Plant:  Dahlia
Disease/Disorder:  Crown Gall
Pathogen:  Agrobacterium tumefaciens
Counties:  La Crosse, Rock

Plant:  Black-Eyed Susan
Disease/Disorder:  Septoria Leaf Spot
Pathogen:  Septoria sp.
County:  Waukesha

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Houseplants

No New Diseases

(Back To Menu)

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Needled Woody Ornamentals

No New Diseases

(Back To Menu)

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Vegetable Crops

No New Diseases

(Back To Menu)

---

Specialty Crops

No New Diseases

(Back To Menu)

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Miscellaneous

No New Entries

(Back To Menu)

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from March 14, 2026 through March 20, 2026.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Hawthorn
Disease/Disorder:  Cedar-Quince Rust
Pathogen:  Gymnosporangium clavipes
County:  Waukesha

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Field Crops

No New Diseases

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Forage Crops

No New Diseases

(Back To Menu)

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Fruit Crops

No New Diseases

(Back To Menu)

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Herbaceous Ornamentals

Plant:  Begonia
Disease/Disorder:  Bacterial Blight
Pathogen:  Xanthomonas sp.
County:  Adams

Plant:  Miscellaneous Herbaceous Annuals
Disease/Disorder:  Root/Crown Rot
Pathogen:  Rhizoctonia sp.
County:  Putnam (IN)

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Houseplants

No New Diseases

(Back To Menu)

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Needled Woody Ornamentals

No New Diseases

(Back To Menu)

---

Vegetable Crops

No New Diseases

(Back To Menu)

---

Specialty Crops

No New Diseases

(Back To Menu)

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Miscellaneous

No New Entries

(Back To Menu)

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from March 7, 2026 through March 13, 2026.

 

 

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Broad-Leafed Woody Ornamentals

No New Diseases

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Field Crops

No New Diseases

(Back To Menu)

---

Forage Crops

No New Diseases

(Back To Menu)

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Fruit Crops

No New Diseases

(Back To Menu)

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Herbaceous Ornamentals

Plant:  Cuphea
Disease/Disorder:  Intumescence
Pathogen:  None
County:  Jefferson

Plant:  Dahlia
Disease/Disorder:  Crown Gall
Pathogen:  Agrobacterium tumefaciens
County:  Rock

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Houseplants

No New Diseases

(Back To Menu)

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Needled Woody Ornamentals

Plant:  Spruce (Norway)
Disease/Disorder:  Winter Burn
Pathogen:  None
County:  Waukesha

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Vegetable Crops

No New Diseases

(Back To Menu)

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Specialty Crops

No New Diseases

(Back To Menu)

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Miscellaneous

No New Entries

(Back To Menu)

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from February 28, 2026 through March 6, 2026.

 

 

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Broad-Leafed Woody Ornamentals

No New Diseases

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Field Crops

No New Diseases

(Back To Menu)

---

Forage Crops

No New Diseases

(Back To Menu)

---

Fruit Crops

No New Diseases

(Back To Menu)

---

Herbaceous Ornamentals

No New Diseases

(Back To Menu)

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Houseplants

No New Diseases

(Back To Menu)

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Needled Woody Ornamentals

No New Diseases

(Back To Menu)

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Vegetable Crops

Plant:  Potato
Disease/Disorder:  Black Scurf
Pathogen:  Rhizoctonia solani
County:  Portage

Plant:  Potato
Disease/Disorder:  Fusarium Dry Rot
Pathogen:  Fusarium sp.
County:  Portage

Plant:  Potato
Disease/Disorder:  Silver Scurf
Pathogen:  Helminthosporium solani
County:  Portage

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Specialty Crops

No New Diseases

(Back To Menu)

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Miscellaneous

No New Entries

(Back To Menu)

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from February 21, 2026 through February 27, 2026.

 

 

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Broad-Leafed Woody Ornamentals

No New Diseases

(Back To Menu)

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Field Crops

No New Diseases

(Back To Menu)

---

Forage Crops

No New Diseases

(Back To Menu)

---

Fruit Crops

No New Diseases

(Back To Menu)

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Herbaceous Ornamentals

Plant:  Impatiens (New Guinea)
Disease/Disorder:  Root Rot
Pathogen:  Pythium sp.
County:  Adams

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Houseplants

No New Diseases

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Needled Woody Ornamentals

Plant:  Fir (Unspecified)
Disease/Disorder:  Gelatinosporium Canker
Pathogen:  Gelatinosporium sp.
County:  Shawano

Plant:  Fir (Unspecified)
Disease/Disorder:  Rhizosphaera Needle Cast
Pathogen:  Rhizosphaera sp.
County:  Shawano

Plant:  Hemlock (Canadian)
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Dane

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Vegetable Crops

No New Diseases

(Back To Menu)

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Specialty Crops

No New Diseases

(Back To Menu)

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Miscellaneous

No New Entries

(Back To Menu)

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from February 14, 2026 through February 20, 2026.

 

 

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Broad-Leafed Woody Ornamentals

No New Diseases

(Back To Menu)

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Field Crops

No New Diseases

(Back To Menu)

---

Forage Crops

No New Diseases

(Back To Menu)

---

Fruit Crops

No New Diseases

(Back To Menu)

---

Herbaceous Ornamentals

No New Diseases

(Back To Menu)

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Houseplants

No New Diseases

(Back To Menu)

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Needled Woody Ornamentals

Plant:  Arborvitae
Disease/Disorder:  Animal Feeding Damage (Suspected)
Pathogen:  None
County:  Ozaukee

Plant:  Pine (White
Disease/Disorder:  Armillaria Root Disease
Pathogen:  Armillaria sp.
County:  Waukesha

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

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Vegetable Crops

No New Diseases

(Back To Menu)

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Specialty Crops

No New Diseases

(Back To Menu)

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Miscellaneous

No New Entries

(Back To Menu)

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from January 31, 2026 through February 6, 2026.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Boxwood
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum sp.
County:  Dane

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

Plant:  Oak (Red)
Disease/Disorder:  White Rot
Pathogen:  Grifola frondosa
County:  Dane

Plant:  Oak (Red)
Disease/Disorder:  White Rot
Pathogen:  Laetiporus sp.
County:  Dane

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Field Crops

No New Diseases

(Back To Menu)

---

Forage Crops

No New Diseases

(Back To Menu)

---

Fruit Crops

No New Diseases

(Back To Menu)

---

Herbaceous Ornamentals

No New Diseases

(Back To Menu)

---

Houseplants

No New Diseases

(Back To Menu)

---

Needled Woody Ornamentals

No New Diseases

(Back To Menu)

---

Vegetable Crops

No New Diseases

(Back To Menu)

---

Specialty Crops

No New Diseases

(Back To Menu)

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Miscellaneous

No New Entries

(Back To Menu)

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from January 24, 2026 through January 30, 2026.

 

 

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Broad-Leafed Woody Ornamentals

No New Diseases

(Back To Menu)

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Field Crops

No New Diseases

(Back To Menu)

---

Forage Crops

No New Diseases

(Back To Menu)

---

Fruit Crops

No New Diseases

(Back To Menu)

---

Herbaceous Ornamentals

No New Diseases

(Back To Menu)

---

Houseplants

No New Diseases

(Back To Menu)

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Needled Woody Ornamentals

No New Diseases

(Back To Menu)

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Vegetable Crops

Plant:  Carrot
Disease/Disorder:  Bacterial Soft Rot
Pathogen:  Unspecified bacterial soft rot bacteria
County:  Dane

Plant:  Carrot
Disease/Disorder:  Root Rot
Pathogen:  Pythium sp.
County:  Dane

Plant:  Potato
Disease/Disorder:  Black Dot
Pathogen:  Colletotrichum coccodes
County:  Columbia

Plant:  Potato
Disease/Disorder:  Silver Scurf
Pathogen:  Helminthosporium solani
County:  Columbia

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Specialty Crops

No New Diseases

(Back To Menu)

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Miscellaneous

No New Entries

(Back To Menu)

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from January 17, 2026 through January 23, 2026.

 

 

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Broad-Leafed Woody Ornamentals

No New Diseases

(Back To Menu)

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Field Crops

No New Diseases

(Back To Menu)

---

Forage Crops

No New Diseases

(Back To Menu)

---

Fruit Crops

No New Diseases

(Back To Menu)

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Herbaceous Ornamentals

Plant:  Bleeding Heart
Disease/Disorder:  Phytoplasma Disease
Pathogen:  Unspecified phytoplasma
County:  Ottawa (MI)

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Houseplants

Plant:  Hibiscus
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum sp.
County:  Milwaukee

Plant:  Mandevilla
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum sp./Glomerella sp.
County:  Milwaukee

(Back To Menu)

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Needled Woody Ornamentals

No New Diseases

(Back To Menu)

---

Vegetable Crops

No New Diseases

(Back To Menu)

---

Specialty Crops

No New Diseases

(Back To Menu)

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Miscellaneous

No New Entries

(Back To Menu)

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from January 10, 2026 through January 16, 2026.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Cottonwood
Disease/Disorder:  White Rot
Pathogen:  Cerioporus (Polyporus) squamosus
County:  Dane

(Back To Menu)

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Field Crops

No New Diseases

(Back To Menu)

---

Forage Crops

No New Diseases

(Back To Menu)

---

Fruit Crops

No New Diseases

(Back To Menu)

---

Herbaceous Ornamentals

No New Diseases

(Back To Menu)

---

Houseplants

No New Diseases

(Back To Menu)

---

Needled Woody Ornamentals

No New Diseases

(Back To Menu)

---

Vegetable Crops

No New Diseases

(Back To Menu)

---

Specialty Crops

No New Diseases

(Back To Menu)

---

Miscellaneous

No New Entries

(Back To Menu)

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