Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from January 1, 2025 through April 4, 2025.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Beech (European)
Disease/Disorder:  Phytophthora Canker
Pathogen:  Phytophthora cactorum
County:  Milwaukee

Plant:  Hornbeam
Disease/Disorder:  Root/Crown Rot
Pathogens:  Phytophthora sp.
County:  Dane

Plant:  Maple (Norway)
Disease/Disorder:  White Rot (on dead wood)
Pathogen:  Dryad’s saddle (Polymorphus squamosus)
County:  Dane

Plant:  Oak (Bur)
Disease/Disorder:  Coryneum Canker
Pathogens:  Coryneum sp.
County:  Dane

Plant:  Oak (Pin)
Disease/Disorder:  Jelly Fungus (Unidentified)
Pathogens:  None
County:  Dane

Plant:  Oak (Red)
Disease/Disorder:  Brittle Cinder (Suspected)
Pathogen:  Kretzschumaria deusta
County:  Dane

Plant:  Oak (White)
Disease/Disorder:  Brittle Cinder (Suspected)
Pathogen:  Kretzschmaria deusta
County:  Dane

Plant:  Oak (Unspecified)
Disease/Disorder:  Armillaria Root Disease (Suspected)
Pathogen:  Armillaria sp.
County:  None (Republic of Singapore)

Plant:  Serviceberry
Disease/Disorder:  Lichens
Pathogen:  None
County:  Dane

Plant:  Tree (Unspecified)
Disease/Disorder:  Phomopsis Gall
Pathogen:  Phomopsis sp.
County:  Dane

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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:  Grape
Disease/Disorder:  Phomopsis Cane and Shoot Spot
Pathogen:  Phomopsis sp. 
County:  Sauk

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Herbaceous Ornamentals

Plant:  Begonia
Disease/Disorder:  Impatiens Necrotic Spot
Pathogen:  Impatiens necrotic spot virus
County:  Clark

Plant:  Calibrachoa
Disease/Disorder:  Powdery Mildew (Suspected)
Pathogen:  Oidium sp.
County:  Taylor

Plant:  Coleus
Disease/Disorder:  Aerial Pythium
Pathogen:  Pythium sp.
County:  Waushara

Plant:  Coleus
Disease/Disorder:  Downy Mildew
Pathogens:  Peronospora lamii
Counties:  Columbia, Dane

Plant:  Geranium
Disease/Disorder:  Gray Mold/Botrytis Blight
Pathogen:  Botrytis cinerea
County:  Clark

Plant:  Geranium
Disease/Disorder:  Root Rot
Pathogen:  Pythium sp.
County:  Clark

Plant:  Gladiolus
Disease/Disorder:  Leafy Gall
Pathogen:  Rhodococcus faciens
County:  Clark

Plant:  Hosta
Disease/Disorder:  Physical Abrasion (Suspected)
Pathogen:  None
County:  Jefferson

Plant:  Pachysandra
Disease/Disorder:  Volutella Blight
Pathogen:  Volutella pachysandricola
County:  Waukesha

Plant:  Pachysandra
Disease/Disorder:  Winter Burn
Pathogen:  None
County:  Waukesha

Plant:  Pericallis
Disease/Disorder:  Impatiens Necrotic Spot
Pathogens:  Impatiens necrotic spot virus
County:  Jefferson

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Houseplants

Plant:  Fig (Weeping)
Disease/Disorder:  Crown Gall (Suspected)
Pathogen:  Agrobacterium tumefaciens
County:  Dane

Plant:  Money Tree
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum sp.
County:  Fond du Lac

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Needled Woody Ornamentals

Plant:  Arborvitae
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Waukesha

Plant:  Arborvitae
Disease/Disorder:  Water Stress (Suspected)
Pathogen:  None
County:  Kenosha

Plant:  Pine (Austrian)
Disease/Disorder:  Diplodia Shoot Blight and Canker (Suspected)
Pathogen:  Diplodia sp.
County:  Racine

Plant:  Pine (Austrian)
Disease/Disorder:  Water Stress (Suspected)
Pathogen:  None
County:  Racine

Plant:  Pine (Japanese Umbrella)
Disease/Disorder:  Needle Spot
Pathogen:  Colletotrichum sp.
County:  Dane

Plant:  Pine (Scots)
Disease/Disorder:  Brown Spot
Pathogens:  Lecanosticta acicola (Mycosphaerella dearnessii)
County:  Clark

Plant:  Spruce (Blue)
Disease/Disorder:  Diplodia Shoot Blight and Canker
Pathogen:  Diplodia sp. 
County:  Dane

Plant:  Spruce (Blue)
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp. 
County:  Dane

Plant:  Spruce (Unspecified)
Disease/Disorder:  Rhizosphaera Needle Cast
Pathogen:  Rhizosphaera kalkhoffii
County:  Dane

Plant:  Spruce (Unspecified)
Disease/Disorder:  Water Stress (Suspected)
Pathogen:  None
Counties:  Dane, Milwaukee

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Vegetable Crops

Plant:  Cabbage
Disease/Disorder:  Black Rot
Pathogen:  Xanthomonas campestris pv. campestris
County:  St. Johns (FL)

Plant:  Cabbage
Disease/Disorder:  Cucumber Mosaic
Pathogen:  Cucumber mosaic virus
County:  Flagler (FL)

Plant:  Cabbage
Disease/Disorder:  Impatiens Necrotic Spot
Pathogen:  Impatiens necrotic spot virus
County:  Flagler (FL)

Plant:  Carrot
Disease/Disorder:  Fusarium Dry Rot
Pathogen:  Fusarium sp.
County:  Dane

Plant:  Collards
Disease/Disorder:  Fertility Issues (suspected)
Pathogen:  None
County:  Dane

Plant:  Kale
Disease/Disorder:  Fertility Issues (suspected)
Pathogen:  None
County:  Dane

Plant:  Potato
Disease/Disorder:  Bacterial Soft Rot
Pathogens:  Pectobacterium atrosepticum, Pectobacterium carotovorum subsp. carotovorum, Pectobacterium parmentieri
Counties:  Portage, Waushara 

Plant:  Potato
Disease/Disorder:  Corky Ringspot
Pathogens:  Tobacco rattle virus
County:  Portage 

Plant:  Potato
Disease/Disorder:  Dry Rot
Pathogens:  Fusarium sp.
Counties:  Portage, Waushara 

Plant:  Potato
Disease/Disorder:  Powdery Scab
Pathogen:  Spongospora subterranea subsp. subterranea
County:  Adams

Plant:  Radish (Watermelon)
Disease/Disorder:  Root Rot
Pathogens:  Fusarium sp., Rhizoctonia sp.
County:  Crawford

Plant:  Radish (Watermelon)
Disease/Disorder:  Root Spot
Pathogen:  Xanthomonas sp.
County:  Crawford

Plant:  Rosemary
Disease/Disorder:  Powdery Mildew (Suspected)
Pathogen:  Oidium sp.
County:  Fond du Lac

Plant:  Tomato
Disease/Disorder:  Edema
Pathogen:  None
County:  Rock

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Specialty Crops

No New Diseases

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Miscellaneous

No New Reports

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