Compiled by Brian Hudelson and Dante Tauscheck
The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from October 11, 2025 through October 17, 2025.
Broad-Leafed Woody Ornamentals
Plant: Boxwood
Disease/Disorder: Fusarium Canker
Pathogen: Fusarium sp.
County: Milwaukee
Plant: Boxwood
Disease/Disorder: Volutella Canker
Pathogen: Volutella sp.
County: Milwaukee
Plant: Hydrangea
Disease/Disorder: Root Rot
Pathogens: Phytophthora sp., Fusarium sp.
County: Dane
Plant: Oak (Black)
Disease/Disorder: Oak Wilt
Pathogen: Bretziella fagacearum
County: Dane
Plant: Oak (Red)
Disease/Disorder: Herbicide Damage
Pathogen: None
County: Dane
Plant: Oak (Unspecified)
Disease/Disorder: Oak Wilt
Pathogen: Bretziella fagacearum
Counties: Dane, Milwaukee
Field Crops
Plant: Soybean
Disease/Disorder: Sclerotinia Stem Rot
Pathogen: Sclerotinia sclerotiorum
County: Hennepin (MN)
Forage Crops
No New Diseases
Fruit Crops
Plant: Apple
Disease/Disorder: Anthracnose
Pathogen: Colletotrichum sp.
County: Waupaca
Plant: Apple
Disease/Disorder: Frogeye Leaf Spot
Pathogen: Botryosphaeria obtusa
County: Waupaca
Plant: Grape
Disease/Disorder: Black Rot
Pathogen: Phyllosticta ampelicida
County: Price
Herbaceous Ornamentals
Plant: Leucanthemum
Disease/Disorder: Crown Gall
Pathogen: Agrobacterium tumefaciens
County: Ottawa (MN)
Plant: Leucanthemum
Disease/Disorder: Leafy Gall
Pathogen: Rhodococcus facians
County: Ottawa (MN)
Houseplants
Plant: Stapelia
Disease/Disorder: Bacterial Spot
Pathogen: Xanthomonas sp.
County: Dane
Needled Woody Ornamentals
Plant: Arborvitae
Disease/Disorder: Root Rot
Pathogen: Phytophthora sp.
County: Portage
Plant: Fir (Serbian)
Disease/Disorder: Rhizosphaera Needle Cast
Pathogens: Rhizosphaera sp.
County: Dane
Plant: Spruce (Blue)
Disease/Disorder: Rhizosphaera Needle Cast
Pathogens: Rhizosphaera kalkhoffii
County: Dane
Vegetable Crops
Plant: Cabbage (Napa)
Disease/Disorder: Black Rot
Pathogen: Xanthomonas campestris pv. campestris
County: Waushara
Plant: Cabbage (Unspecified)
Disease/Disorder: Black Rot
Pathogens: Xanthomonas campestris pv. campestris
County: Waushara
Plant: Potato
Disease/Disorder: Bacterial Soft Rot
Pathogens: Pectobacterium carotovorum subsp. carotovorum, Pectobacterium parmentieri
County: Marquette
Plant: Squash (Butternut)
Disease/Disorder: Sour Rot
Pathogens: Geotrichum candidum
County: Dane
Specialty Crops
No New Diseases
Miscellaneous
No New Entries