Compiled by Brian Hudelson and Dante Tauscheck
The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from June 21, 2025 through June 27, 2025.
Broad-Leafed Woody Ornamentals
Plant: Crabapple
Disease/Disorder: Apple Scab
Pathogen: Venturia inaequalis
Counties: Dane, Waukesha
Plant: Crabapple
Disease/Disorder: Fire Blight
Pathogen: Erwinia amylovora
County: Buffalo
Plant: Crabapple
Disease/Disorder: Sphaeropsis Canker
Pathogen: Sphaeropsis sp.
County: Dane
Plant: Maple (Unspecified)
Disease/Disorder: Wood Rot (Suspected)
Pathogen: Unspecified wood rot fungus
County: Eau Claire
Plant: Oak (Red)
Disease/Disorder: Herbicide Damage
Pathogen: None
County: Dane
Plant: Oak (Swamp White)
Disease/Disorder: Chlorosis
Pathogen: None
County: Dane
Plant: Serviceberry
Disease/Disorder: Cedar-Quince Rust
Pathogen: Gymnosporangium clavipes
County: Dane
Field Crops
No New Diseases
Forage Crops
No New Diseases
Fruit Crops
Plant: Apple
Disease/Disorder: Cytospora Canker
Pathogen: Cytospora sp.
County: Waupaca
Plant: Apple
Disease/Disorder: Fire Blight
Pathogen: Erwinia amylovora
County: Waupaca
Plant: Apple
Disease/Disorder: Fusarium Canker
Pathogen: Fusarium sp.
County: Waupaca
Plant: Apple
Disease/Disorder: Fire Blight
Pathogen: Erwinia amylovora
County: Waupaca
Plant: Apple
Disease/Disorder: Nectria Twig Blight
Pathogen: Nectria sp./Tubercularia sp.
County: Waupaca
Plant: Apple
Disease/Disorder: Cold Injury (Suspected)
Pathogen: None
County: Marathon
Plant: Strawberry
Disease/Disorder: Fusarium Wilt
Pathogen: Fusarium oxysporum
County: Eau Claire
Plant: Cherry
Disease/Disorder: Bacterial Canker
Pathogen: Pseudomonas syringae
County: Oneida
Plant: Cherry
Disease/Disorder: Cold Injury (Suspected)
Pathogen: None
County: Oneida
Plant: Raspberry
Disease/Disorder: Anthracnose
Pathogen: Elsinoe necator
County: Dodge
Plant: Raspberry
Disease/Disorder: Cane Blight
Pathogen: Leptosphaeria coniothyrium
County: Dodge
Plant: Raspberry
Disease/Disorder: Root Rot
Pathogen: Cylindrocarpon sp.
County: Dodge
Herbaceous Ornamentals
No New Diseases
Houseplants
No New Diseases
Needled Woody Ornamentals
Plant: Arborvitae
Disease/Disorder: Phyllosticta Needle Blight
Pathogen: Phyllosticta sp.
County: Dane
Plant: Arborvitae
Disease/Disorder: Water Stress (Suspected)
Pathogen: None
County: Dane
Plant: Juniper
Disease/Disorder: Diplodia Shoot Blight and Canker
Pathogen: Diplodia sp.
County: Dane
Plant: Juniper
Disease/Disorder: Winter Burn (Suspected)
Pathogen: None
County: Waukesha
Plant: Pine (Scots)
Disease/Disorder: Diplodia Shoot Blight and Canker
Pathogen: Diplodia sp.
County: Fond du Lac
Plant: Pine (Scots)
Disease/Disorder: Pine-Oak Gall Rust
Pathogen: Cronartium quercuum f. sp. banksianae
County: Fond du Lac
Plant: Pine (Scots)
Disease/Disorder: Water Stress (Suspected)
Pathogen: None
County: Fond du Lac
Plant: Pine (Swiss Stone)
Disease/Disorder: Phomopsis Canker
Pathogen: Phomopsis sp.
County: Dane
Plant: Spruce (Unspecified)
Disease/Disorder: Rhizosphaera Needle Cast
Pathogen: Rhizosphaera kalkhoffii
County: Dane
Plant: Spruce (Unspecified)
Disease/Disorder: Winter Burn
Pathogen: None
County: Door
Vegetable Crops
Plant: Garlic
Disease/Disorder: Aster Yellows
Pathogen: Aster Yellows Phytoplasma
County: Pierce
Plant: Potato
Disease/Disorder: Black Leg
Pathogens: Pectobacterium carotovorum subsp. carotovorum, Pectobacterium parmentieri
County: Carroll (IL)
Plant: Tomato
Disease/Disorder: Herbicide Damage
Pathogen: None
County: Outagamie
Plant: Zucchini
Disease/Disorder: Herbicide Damage
Pathogen: None
County: Outagamie
Specialty Crops
No New Diseases
Miscellaneous
Mushroom ID: Glistening Inky Cap (Coprinellus micaceus)
County: Eau Claire
Mushroom ID: Scotch Bonnet (Marasmius oreades)
County: Waukesha