Compiled by Brian Hudelson and Hulubanche Kassa

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from May 2, 2026 through May 8, 2026.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Cotoneaster
Disease/Disorder:  Root/Crown Rot
Pathogen:  Pythium sp.
County:  Walworth

Plant:  Walnut
Disease/Disorder:  Lichens
Pathogen:  None
County:  Richland

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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:  Cherry (Sour)
Disease/Disorder:  Bacterial Canker
Pathogen:  Pseudomonas syringae
County:  Milwaukee

Plant:  Cherry (Sour)
Disease/Disorder:  Brown Rot
Pathogen:  Monilinia sp.
County:  Milwaukee

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Herbaceous Ornamentals

Plant:  Pussytoes
Disease/Disorder:  Root/Crown Rot
Pathogens:  Rhizoctonia sp.
County:  Rock

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Houseplants

No New Diseases

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Needled Woody Ornamentals

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

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Vegetable Crops

Plant:  Potato
Disease/Disorder:  Bacterial Soft Rot
Pathogen:  Pectobacterium carotorvorum subsp. carotovorum, Pectobacterium parmentieri
County:  St. Joseph (MI)

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

Plant:  Tomato
Disease/Disorder:  Gray Mold/Botrytis Blight
Pathogen:  Botrytis cinerea
County:  Vernon

Plant:  Tomato
Disease/Disorder:  Magnesium Deficiency (Suspected)
Pathogen:  None
County:  Vernon

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Specialty Crops

No New Diseases

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Miscellaneous

No New Entries

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