Compiled by Brian Hudelson and Dante Tauscheck
The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from November 8, 2025 through November 14, 2025.
Page Table of Contents
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Broad-Leafed Woody Ornamentals
Plant: Magnolia
Disease/Disorder: Verticillium Wilt
Pathogen: Verticillium sp.
County: Kenosha
Plant: Maple (Sugar)
Disease/Disorder: Steganosporium Canker
Pathogen: Steganosporium sp.
County: Dane
Plant: Oak (Bur)
Disease/Disorder: Bur Oak Blight
Pathogen: Tubakia iowensis
Counties: Kenosha, Racine
Plant: Oak (Bur)
Disease/Disorder: Tubakia Leaf Spot
Pathogen: Tubakia dryina
Counties: Kenosha, Racine
Plant: Spirea (Birchleaf)
Disease/Disorder: Alternaria Leaf Spot
Pathogen: Alternaria sp.
County: Brown
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Field Crops
Plant: Corn
Disease/Disorder: Fusarium Stalk Rot
Pathogen: Fusarium sp.
County: Sauk
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Forage Crops
No New Diseases
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Fruit Crops
Plant: Apple
Disease/Disorder: Apple Scab
Pathogen: Venturia inaequalis
County: Clark
Plant: Apple
Disease/Disorder: Bitter Rot
Pathogen: Colletotrichum sp.
County: Clark
Plant: Apple
Disease/Disorder: Flyspeck
Pathogen: Zygophiala jamaicensis
County: Clark
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Herbaceous Ornamentals
No New Diseases
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Houseplants
No New Diseases
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Needled Woody Ornamentals
Plant: Spruce (Unspecified)
Disease/Disorder: Rhizosphaera Needle Cast
Pathogens: Rhizosphaera kalkhoffii
Counties: Dane, Sheboygan, Waukesha
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Vegetable Crops
No New Diseases
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Specialty Crops
No New Diseases
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Miscellaneous
No New Entries
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