Compiled by Brian Hudelson and Dante Tauscheck
The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from July 19, 2025 through July 25, 2025.
Broad-Leafed Woody Ornamentals
Plant: Boxwood
Disease/Disorder: Volutella Canker
Pathogen: Volutella sp.
County: Kenosha
Plant: Buckeye (Red)
Disease/Disorder: Frost Crack
Pathogen: None
County: Waukesha
Plant: Crabapple
Disease/Disorder: Sphaeropsis Canker
Pathogen: Sphaeropsis sp.
County: Dane
Plant: Maple
Disease/Disorder: Phytophthora Canker
Pathogen: Phytophthora sp.
County: Outagamie
Plant: Maple (Korean)
Disease/Disorder: Diplodia Canker
Pathogen: Diplodia sp.
County: Dane
Plant: Oak (Bur)
Disease/Disorder: Oak Wilt
Pathogen: Bretziella fagacearum
County: Kenosha
Plant: Oak (Unspecified)
Disease/Disorder: Anthracnose
Pathogen: Discula sp.
County: Cook (IL)
Plant: Oak (Unspecified)
Disease/Disorder: Chlorosis
Pathogen: None
Counties: Dane, Pierce, Cook (IL)
Plant: Oak (Unspecified)
Disease/Disorder: Oak Wilt
Pathogen: Bretziella fagacearum
County: Sauk
Plant: Oak (Unspecified)
Disease/Disorder: Tubakia Leaf Spot
Pathogen: Tubakia dryina
County: Cook (IL)
Plant: Pear (Ornamental)
Disease/Disorder: Fire Blight
Pathogen: Erwinia amylovora
County: Dane
Plant: Pear (Ornamental)
Disease/Disorder: Pear Trellis Rust (Suspected)
Pathogen: Gymnosporangium sabinae
County: Sheboygan
Plant: Rose
Disease/Disorder: Rose Rosette (Suspected)
Pathogen: Rose rosette virus
County: Milwaukee
Field Crops
Plant: Soybean
Disease/Disorder: Soybean Cyst Nematode
Pathogen: Heterodera glycines
County: Outagamie
Plant: Soybean
Disease/Disorder: Sudden Death Syndrome
Pathogen: Fusarium virguliforme
County: Outagamie
Forage Crops
No New Diseases
Fruit Crops
Plant: Cherry (Sweet)
Disease/Disorder: Bacterial Canker
Pathogen: Pseudomonas syringae
County: Portage
Plant: Cherry (Sweet)
Disease/Disorder: Phyllosticta Leaf Spot
Pathogen: Phyllosticta sp.
County: Portage
Plant: Cherry (Unspecified)
Disease/Disorder: Brown Rot
Pathogen: Monilinia fructicola
County: Dane
Plant: Grape (‘Concord’)
Disease/Disorder: Herbicide Damage
Pathogen: None
County: Dane
Herbaceous Ornamentals
Plant: Aralia
Disease/Disorder: Verticillium Wilt
Pathogen: Verticillium sp.
County: Dane
Plant: Miscellaneous Herbaceous Ornamentals
Disease/Disorder: Dog Vomit Slime Mold
Pathogen: None
County: Jackson
Plant: Petunia
Disease/Disorder: Root Rot
Pathogens: Phytophthora sp., Rhizoctonia sp.
County: Kenosha
Plant: Zinnia
Disease/Disorder: Virus Disease (Suspected)
Pathogen: Unspecified virus
County: Racine
Houseplants
No New Diseases
Needled Woody Ornamentals
Plant: Arborvitae
Disease/Disorder: Phomopsis Canker
Pathogen: Phomopsis sp.
County: Dane
Plant: Arborvitae
Disease/Disorder: Root Rot
Pathogen: Fusarium sp.
County: Dane
Plant: Fir (Korean)
Disease/Disorder: Rhizosphaera Needle Cast
Pathogen: Rhizosphaera sp.
County: Dane
Plant: Fir (Korean)
Disease/Disorder: Root Rot
Pathogens: Pythium sp., Fusarium sp.
County: Dane
Plant: Fir (Unspecified)
Disease/Disorder: Root Rot
Pathogen: Phytophthora sp.
County: Marathon
Plant: Spruce (Unspecified)
Disease/Disorder: Cytospora Canker
Pathogen: Cytospora sp.
County: Dane
Plant: Yew
Disease/Disorder: Grade Change
Pathogen: None
County: Sheboygan
Vegetable Crops
Plant: Bean (Pole)
Disease/Disorder: Fertility Issues (Suspected)
Pathogen: None
County: Walworth
Plant: Onion
Disease/Disorder: Bacterial Leaf Necrosis (Suspected)
Pathogen: Pseudomonas marginalis
County: Dane
Plant: Pea
Disease/Disorder: Root Rot
Pathogens: Aphanomyces euteiches, Fusarium sp., Rhizoctonia sp., Phytophthora sp.
County: Dodge
Plant: Tomato
Disease/Disorder: Septoria Leaf Spot
Pathogen: Septoria lycopersici
County: Walworth
Plant: Watermelon
Disease/Disorder: Virus Disease (Suspected)
Pathogen: Unspecified virus
County: St. Croix
Specialty Crops
No New Diseases
Miscellaneous
No New Entries