Compiled by Brian Hudelson and Dante Tauscheck
The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from May 17, 2025 through May 23, 2025.
Broad-Leafed Woody Ornamentals
Plant: Boxwood
Disease/Disorder: Volutella Canker
Pathogen: Volutella sp.
County: Waukesha
Plant: Crabapple
Disease/Disorder: Lichens
Pathogen: None
County: Florence
Plant: Crabapple
Disease/Disorder: Phomopsis Canker
Pathogen: Phomopsis sp.
County: Dane
Plant: Crabapple
Disease/Disorder: Sapsucker Damage
Pathogen: None
County: Florence
Plant: Crabapple
Disease/Disorder: Sphaeropsis Canker
Pathogen: Sphaeropsis sp.
County: Dane
Plant: Lilac
Disease/Disorder: Ascochyta Leaf Blight
Pathogen: Ascochyta sp.
County: Walworth
Field Crops
No New Diseases
Forage Crops
No New Diseases
Fruit Crops
Plant: Apple
Disease/Disorder: Sooty Mold
Pathogen: Miscellaneous sooty mold fungi
County: Iowa
Plant: Plum
Disease/Disorder: Black Knot
Pathogen: Apiosporina morbosa
County: Jefferson
Herbaceous Ornamentals
Plant: Pachysandra
Disease/Disorder: Volutella Blight
Pathogen: Volutella pachysandricola
Counties: Columbia, Waukesha
Houseplants
No New Diseases
Needled Woody Ornamentals
Plant: Arborvitae
Disease/Disorder: Phyllosticta Needle Blight
Pathogen: Phyllosticta sp.
County: Waukesha
Plant: Fir (White)
Disease/Disorder: Phomopsis Canker
Pathogen: Phomopsis sp.
County: Dane
Plant: Juniper
Disease/Disorder: Phomopsis Tip Blight
Pathogen: Phomopsis juniperovora
County: Milwaukee
Plant: Juniper
Disease/Disorder: Winter Burn (Suspected)
Pathogen: None
County: Waukesha
Plant: Spruce (Norway)
Disease/Disorder: Winter Burn (Suspected)
Pathogen: None
Counties: Milwaukee, Washington
Plant: Spruce (Unspecified)
Disease/Disorder: Rhizosphaera Needle Cast
Pathogen: Rhizosphaera kalkhoffii
County: Dane
Vegetable Crops
Plant: Cabbage
Disease/Disorder: Damping-Off
Pathogen: Pythium sp.
County: Waushara
Plant: Cantaloupe
Disease/Disorder: Damping-Off
Pathogen: Pythium sp.
County: Monroe
Plant: Pea
Disease/Disorder: Root Rot
Pathogen: Pythium sp.
County: Waushara
Specialty Crops
No New Diseases
Miscellaneous
No New Reports