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.
Page Table of Contents
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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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