Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from April 18, 2026 through April 24, 2026.

 

 

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Broad-Leafed Woody Ornamentals

No New Diseases

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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:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Winnebago

Plant:  Apple
Disease/Disorder:  Wood Rot (Suspected)
Pathogen:  Unidentified wood rot fungus
County:  Winnebago

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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:  Arborvitae
Disease/Disorder:  Phyllosticta Needle Blight
Pathogen:  Phyllosticta sp.
County:  Dane

Plant:  Arborvitae
Disease/Disorder:  Winter Burn
Pathogen:  Phomopsis sp.
County:  Dane

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Vegetable Crops

Plant:  Potato
Disease/Disorder:  Bacterial Soft Rot
Pathogen:  Pectobacterium sp.
County:  Adams

Plant:  Potato
Disease/Disorder:  Black Dot
Pathogen:  Colletotrichum coccodes
Counties:  Adams, Langlade

Plant:  Potato
Disease/Disorder:  Common Scab
Pathogen:  Streptomyces scabies
County:  Langlade

Plant:  Potato
Disease/Disorder:  Grey Leaf Spot
Pathogen:  Stemphylium sp.
County:  Sauk

Plant:  Potato
Disease/Disorder:  Silver Scurf
Pathogen:  Helminthosporium solani
Counties:  Adams, Langlade

Plant:  Watermelon
Disease/Disorder:  Damping-Off
Pathogens:  Rhizoctonia sp., Fusarium sp.
County:  Sauk

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Specialty Crops

No New Diseases

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Miscellaneous

No New Entries

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