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.
Page Table of Contents
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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
Pathogen: Phytophthora sp.
County: Waukesha
Plant: Spruce (Black Hills)
Disease/Disorder: Spruce Needle Drop
Pathogen: Setomelanomma holmii
County: Rock
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Vegetable Crops
Plant: Potato
Disease/Disorder: Bacterial Soft Rot
Pathogens: 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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