Compiled by Brian Hudelson and Dante Tauscheck
The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from May 24, 2025 through May 30, 2025.
Broad-Leafed Woody Ornamentals
Plant: Aspen
Disease/Disorder: Venturia Leaf and Shoot Blight
Pathogen: Venturia moreletii
County: La Crosse
Plant: Boxwood
Disease/Disorder: Fusarium Canker
Pathogen: Fusarium sp.
County: Waukesha
Plant: Boxwood
Disease/Disorder: Volutella Canker
Pathogen: Volutella sp.
County: Waukesha
Plant: Oak (Unspecified)
Disease/Disorder: Armillaria Root Disease (Suspected)
Pathogen: Armillaria sp.
County: Dane
Plant: Pear (Callery)
Disease/Disorder: Cold Injury (Suspected)
Pathogen: None
County: Waukesha
Plant: Rhododendron
Disease/Disorder: Root Rot
Pathogen: Pythium sp.
County: Washington
Plant: Rhododendron
Disease/Disorder: Seimatosporium Leaf Spot
Pathogen: Seimatosporium sp.
County: Washington
Field Crops
No New Diseases
Forage Crops
No New Diseases
Fruit Crops
Plant: Gooseberry
Disease/Disorder: Gooseberry Rust
Pathogen: Puccinia caracina var. pringsheimiana
County: Dane
Plant: Peach
Disease/Disorder: Peach Leaf Curl
Pathogen: Taphrina deformans
County: Dane
Herbaceous Ornamentals
Plant: Pachysandra
Disease/Disorder: Volutella Blight
Pathogen: Volutella pachysandricola
Counties: Milwaukee, Waukesha
Plant: Pansy
Disease/Disorder: Root Rot
Pathogens: Phytophthora sp., Rhizoctonia sp.
County: Kenosha
Plant: Peony
Disease/Disorder: Cold Injury
Pathogen: None
County: Vernon
Houseplants
No New Diseases
Needled Woody Ornamentals
Plant: Arborvitae
Disease/Disorder: Transplant Shock (Suspected)
Pathogen: None
County: Waukesha
Plant: Arborvitae
Disease/Disorder: Urine Damage (Suspected)
Pathogen: None
County: Waukesha
Plant: Fir (Unspecified)
Disease/Disorder: Phyllosticta Needle Blight
Pathogen: Phyllosticta sp.
County: Waukesha
Plant: Spruce (Unspecified)
Disease/Disorder: Rhizosphaera Needle Cast
Pathogen: Rhizosphaera kalkhoffii
County: Clark
Plant: Spruce (Unspecified)
Disease/Disorder: Rhizosphaera Needle Cast (Suspected)
Pathogen: Rhizosphaera kalkhoffii
County: Saratoga (NY)
Vegetable Crops
No New Diseases
Specialty Crops
No New Diseases
Miscellaneous
Mushroom ID: Glistening Inky Cap (Coprinellus micaceus)
County: Dane