Compiled by Brian Hudelson and Dante Tauscheck
The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from October 25, 2025 through October 31, 2025.
Broad-Leafed Woody Ornamentals
Plant: Boxwood
Disease/Disorder: Volutella Canker
Pathogen: Volutella sp.
County: Brown
Plant: Hydrangea
Disease/Disorder: Bacterial Leaf Spot
Pathogens: Xanthomonas sp.
County: Walworth
Plant: Oak (Red)
Disease/Disorder: Anthracnose
Pathogen: Discula sp.
County: Door
Plant: Oak (Red)
Disease/Disorder: Chlorosis
Pathogen: None
County: Door
Plant: Oak (Red)
Disease/Disorder: Tubakia Leaf Spot
Pathogen: Tubakia dryina
County: Door
Plant: Oak (Red)
Disease/Disorder: Tubercularia Canker
Pathogen: Tubercularia sp.
County: Dane
Plant: Oak (Swamp White)
Disease/Disorder: Bacterial Scorch (Suspected)
Pathogen: Xylella fastidiosa
County: Dane
Plant: Weigela
Disease/Disorder: Bacterial Leaf Spot
Pathogens: Xanthomonas sp.
County: Walworth
Field Crops
No New Diseaes
Forage Crops
No New Diseases
Fruit Crops
No New Diseases
Herbaceous Ornamentals
Plant: Dahlia
Disease/Disorder: Crown Gall
Pathogen: Agrobacterium tumefaciens
County: Bucks (PA)
Houseplants
No New Diseases
Needled Woody Ornamentals
Plant: Spruce (Black)
Disease/Disorder: Rhizosphaera Needle Cast
Pathogens: Rhizosphaera kalkhoffii
County: Green Lake
Plant: Spruce (White)
Disease/Disorder: Rhizosphaera Needle Cast
Pathogens: Rhizosphaera kalkhoffii
County: Green Lake
Vegetable Crops
Plant: Tomato
Disease/Disorder: Anthracnose
Pathogen: Colletotrichum sp.
County: Pierce
Plant: Tomato
Disease/Disorder: Septoria Leaf Spot
Pathogen: Septoria lycopersici
County: Pierce
Specialty Crops
No New Diseases
Miscellaneous
No New Entries