Compiled by Brian Hudelson and Dante Tauscheck
The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from July 5, 2025 through July 11, 2025.
Broad-Leafed Woody Ornamentals
Plant: Boxwood
Disease/Disorder: Fusasrium Canker
Pathogen: Fusarium sp.
County: Waukesha
Plant: Boxwood
Disease/Disorder: Volutella Canker
Pathogen: Volutella sp.
County: Waukesha
Plant: Honey Locust
Disease/Disorder: Thyronectria Canker
Pathogen: Thyronectria austroamericana
County: Dane
Plant: Lilac (Shrub)
Disease/Disorder: Root Rot
Pathogen: Rhizoctonia sp.
County: La Crosse
Plant: Maple (Silver)
Disease/Disorder: Anthracnose
Pathogen: Discula sp.
County: Waukesha
Plant: Maple (Silver)
Disease/Disorder: Root Rot
Pathogen: Fusarium sp.
County: Waukesha
Plant: Maple (Sugar)
Disease/Disorder: Steganosporium Canker
Pathogen: Steganosporium sp.
County: Dane
Plant: Oak (Bur)
Disease/Disorder: Anthracnose
Pathogen: Discula sp.
County: Fond du Lac
Plant: Oak (Bur)
Disease/Disorder: Bur Oak Blight
Pathogen: Tubakia iowensis
County: Fond du Lac
Plant: Oak (Bur)
Disease/Disorder: Monochaetia Leaf Spot
Pathogen: Monochaetia sp.
County: Fond du Lac
Plant: Oak (White)
Disease/Disorder: Anthracnose
Pathogen: Discula sp.
County: Waukesha
Plant: Oak (White)
Disease/Disorder: Monochaetia Leaf Spot
Pathogen: Monochaetia sp.
County: Waukesha
Plant: Oak (White)
Disease/Disorder: Tubakia Leaf Spot
Pathogen: Tubakia dryina
County: Waukesha
Plant: Oak (Unspecified)
Disease/Disorder: Anthracnose
Pathogen: Discula sp.
County: Waukesha
Plant: Oak (Unspecified)
Disease/Disorder: Monochaetia Leaf Spot
Pathogen: Monochaetia sp.
County: Waukesha
Plant: Serviceberry
Disease/Disorder: Transplant Shock (Suspected)
Pathogen: None
County: Dane
Field Crops
Plant: Corn (Seed)
Disease/Disorder: Root Rot
Pathogen: Rhizoctonia sp.
County: Lafayette
Plant: Corn (Seed)
Disease/Disorder: Yellow Leaf Blight
Pathogen: Phyllosticta maydis
County: Lafayette
Plant: Soybean
Disease/Disorder: Fusarium Blight
Pathogen: Fusarium oxysporum
County: Fillmore (MN)
Plant: Wheat
Disease/Disorder: Root Rot
Pathogens: Rhizoctonia sp., Fusarium sp.
County: Sauk
Forage Crops
No New Diseases
Fruit Crops
Plant: Apple
Disease/Disorder: Sphaeropsis Canker
Pathogen: Sphaeropsis sp.
County: Rock
Plant: Hazelnut
Disease/Disorder: Root Rot
Pathogen: Fusarium sp.
County: Sauk
Plant: Peach
Disease/Disorder: Nitrogen Deficiency (Suspected)
Pathogen: None
County: Racine
Herbaceous Ornamentals
Plant: Vinca
Disease/Disorder: Root Rot
Pathogen: Rhizoctonia sp.
County: Dane
Houseplants
No New Diseases
Needled Woody Ornamentals
Plant: Juniper
Disease/Disorder: Phomopsis Tip Blight
Pathogen: Phomopsis juniperovora
County: Dane
Plant: Spruce (Blue)
Disease/Disorder: Improper Planting
Pathogen: None
County: Dane
Plant: Spruce (Blue)
Disease/Disorder: Phomopsis Canker
Pathogen: Phomopsis sp.
County: Dane
Plant: Spruce (Blue)
Disease/Disorder: Water Stress
Pathogen: None
County: Dane
Plant: Yew
Disease/Disorder: Twig Blight
Pathogen: Phyllosticta sp.
County: Sheboygan
Vegetable Crops
Plant: Brussels Sprouts
Disease/Disorder: Herbicide Damage (Suspected)
Pathogen: None
County: Sauk
Plant: Cabbage
Disease/Disorder: Black Rot
Pathogen: Xanthomonas campestris pv. campestris
County: Waushara
Plant: Pea
Disease/Disorder: Root Rot
Pathogens: Aphanomyces euteiches, Fusarium sp., Rhizoctonia sp.
County: Adams
Plant: Potato
Disease/Disorder: Powdery Scab
Pathogen: Spongospora subterranea subsp. subterranea
County: Adams
Plant: Tomato
Disease/Disorder: Septoria Leaf Spot
Pathogen: Septoria lycopersici
County: Milwaukee
Specialty Crops
No New Diseases
Miscellaneous
No New Entries