Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from October 4, 2025 through October 10, 2025.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Dogwood (Red-Twigged)
Disease/Disorder:  Botryosphaeria Canker
Pathogen:  Botryosphaeria sp.
County:  Milwaukee

Plant:  Elm (‘Princeton’)
Disease/Disorder:  Root Rot
Pathogens:  Phytophthora sp.
County:  Brown

Plant:  Honeysuckle (Shrub)
Disease/Disorder:  Root Rot
Pathogens:  Phytophthora sp.
County:  Dane

Plant:  Lilac
Disease/Disorder:  Septoria Leaf Spot
Pathogen:  Septoria sp.
County:  Marathon

Plant:  Maple (Norway)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Dane

Plant:  Oak (Bur)
Disease/Disorder:  Bur Oak Blight
Pathogen:  Tubakia iowensis
County:  Winnebago

Plant:  Oak (Pin)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Dane

Plant:  Oak (Red)
Disease/Disorder:  Anthracnose
Pathogen:  Discula sp.
County:  Milwaukee

Plant:  Oak (Red)
Disease/Disorder: Chlorosis
Pathogen:  None
County:  Milwaukee

Plant:  Oak (Red)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
Counties:  Milwaukee, Racine

Plant:  Oak (White)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Dane

Plant:  Oak (Unspecified)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Dane

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Field Crops

No New Diseases

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Forage Crops

Plant:  Barley
Disease/Disorder:  Blotch Spot
Pathogen:  Bipolaris sorokiniana
Counties:  Dodge, Sheboygan

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Fruit Crops

Plant:  Apple
Disease/Disorder:  Fly Speck
Pathogen:  Zygophiala jamaicensis
County:  Ozaukee

Plant:  Apple
Disease/Disorder:  Sooty Blotch
Pathogen:  Miscellaneous sooty blotch fungi
County:  Ozaukee

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Herbaceous Ornamentals

Plant:  Impatiens
Disease/Disorder: Root Rot
Pathogens:  Phytophthora sp., Rhizoctonia  sp.
County:  Oconto

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Houseplants

No New Diseases

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Needled Woody Ornamentals

Plant:  Arborvitae
Disease/Disorder:  Root Rot
Pathogens:  Phytophthora sp.
County:  Waukesha

Plant:  Spruce (Black Hills)
Disease/Disorder:  Spruce Needle Drop
Pathogens:  Setomelanomma holmii
County:  Rock

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Vegetable Crops

Plant:  Potato
Disease/Disorder:  Bacterial Soft Rot
Pathogen:  Pectobacterium carotovorum subsp. carotovorum, Pectobacterium parmentieri
County:  Marquette

Plant:  Potato
Disease/Disorder:  Black Dot
Pathogen:  Colletotrichum coccodes
County:  Adams

Plant:  Potato
Disease/Disorder:  Verticillium Wilt
Pathogen:  Verticillium sp.
County:  Adams

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Specialty Crops

No New Diseases

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Miscellaneous

No New Entries

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