Compiled by Brian Hudelson and Hulubanche Kassa

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from October 17, 2026 through October 23, 2026.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Bittersweet (American)
Disease/Disorder:  Root Rot
Pathogens:  Pythium sp., Thielaviopsis sp., Fusarium sp.
County:  Rock

Plant:  Maple (Sugar)
Disease/Disorder:  Steganosporium Canker
Pathogen:  Steganosporium sp.
County:  Waukesha

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

Plant:  Oak (Unspecified)
Disease/Disorder:  Herbicide Damage
Pathogen:  None
County:  Rock

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Field Crops

No New Diseases

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Forage Crops

No New Diseases

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Fruit Crops

Plant:  Apple
Disease/Disorder:  Bitter Rot
Pathogen:  Colletotrichum sp.
County:  Jefferson

Plant:  Apple
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Milwaukee

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Herbaceous Ornamentals

Plant:  Butterfly Weed
Disease/Disorder:  Root Rot
Pathogens: Rhizoctonia sp., Fusarium sp.
County:  Rock

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Houseplants

No New Diseases

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Needled Woody Ornamentals

Plant:  Spruce (Blue)
Disease/Disorder:  Rhizosphaera Needle Cast
Pathogen: Rhizosphaera kalkhoffii
County:  Door

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Vegetable Crops

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

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

Plant:  Potato
Disease/Disorder:  Black Scurf
Pathogen:  Rhizoctonia sp.
County:  Adams

Plant:  Potato
Disease/Disorder:  Leak
Pathogen:  Pythium sp.
County:  Adams, Waushara

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Specialty Crops

No New Diseases

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Miscellaneous

No New Entries

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