Compiled by Brian Hudelson and Hulubanche Kassa
The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from June 27, 2026 through July 3, 2026.
Broad-Leafed Woody Ornamentals
Plant: Boxwood
Disease/Disorder: Volutella Canker
Pathogen: Volutella sp.
County: Waukesha
Plant: Maple (Red)
Disease/Disorder: Anthracnose
Pathogen: Discula sp.
County: Waukesha
Plant: Maple (Silver)
Disease/Disorder: Anthracnose
Pathogen: Discula sp.
County: Dane
Plant: Oak (White)
Disease/Disorder: Root Rot
Pathogen: Phytophthora sp.
County: Waukesha
Plant: Oak (Unspecified)
Disease/Disorder: Wood Rot
Pathogen: Bondarzewia berkeleyi
County: Marathon
Plant: Redbud
Disease/Disorder: Eutypella Canker
Pathogen: Eutypella sp.
County: Milwaukee
Plant: Rose-of-Sharon
Disease/Disorder: Virus Disease (Suspected)
Pathogen: Unspecified virus
County: Dane
Field Crops
Plant: Corn
Disease/Disorder: Eyespot
Pathogen: Kabatiella zeae
County: Richland
Forage Crops
No New Diseases
Fruit Crops
Plant: Apple
Disease/Disorder: Armillaria Root Disease (Suspected)
Pathogen: Armillaria sp.
County: Calumet
Plant: Apple
Disease/Disorder: Diaporthe Canker
Pathogen: Diaporthe sp.
County: Calumet
Plant: Apple
Disease/Disorder: Root/Crown Rot
Pathogens: Phytophthora sp., Fusarium sp.
County: Calumet
Plant: Cherry
Disease/Disorder: Bacterial Canker
Pathogen: Pseudomonas syringae
County: Dane
Plant: Pear
Disease/Disorder: Pear Scab
Pathogen: Venturia pirina
County: Portage
Herbaceous Ornamentals
Plant: Canada Wild Ginger
Disease/Disorder: Bacterial Leaf Spot
Pathogen: Xanthomonas sp.
County: Green
Plant: Geranium (Wild)
Disease/Disorder: Bacterial Blight
Pathogen: Xanthomonas sp.
County: Green
Houseplants
No New Diseases
Needled Woody Ornamentals
Plant: Juniper
Disease/Disorder: Diplodia Shoot Blight and Canker
Pathogen: Diplodia sp.
County: Waukesha
Plant: Juniper
Disease/Disorder: Phomopsis Tip Blight
Pathogen: Phomopsis juniperovora
County: Waukesha
Plant: Pine (Austrian)
Disease/Disorder: Dothistroma Needle Blight
Pathogen: Dothistroma sp.
County: Ozaukee
Plant: Pine (White)
Disease/Disorder: Blue Stain
Pathogen: Unspecified blue stain fungus
County: Dane
Plant: Pine (White)
Disease/Disorder: Diplodia Shoot Blight and Canker
Pathogen: Diplodia sp.
County: Dane
Plant: Spruce (Blue)
Disease/Disorder: Rhizosphaera Needle Cast
Pathogen: Rhizosphaera kalkhoffii
County: Dane
Plant: Spruce (Norway)
Disease/Disorder: Winter Burn
Pathogen: None
County: Waukesha
Plant: Spruce (White)
Disease/Disorder: Rhizosphaera Needle Cast
Pathogen: Rhizosphaera kalkhoffii
County: Dane
Plant: Spruce (Unspecified)
Disease/Disorder: Rhizosphaera Needle Cast
Pathogen: Rhizosphaera kalkhoffii
County: Dane
Vegetable Crops
Plant: Potato
Disease/Disorder: Bacterial Soft Rot
Pathogen: Pectobacterium carotovorum subsp. carotovorum
County: Portage
Plant: Potato
Disease/Disorder: Root Rot
Pathogen: Rhizoctonia sp.
County: Portage
Specialty Crops
No New Diseases
Miscellaneous
No New Entries