Compiled by Brian Hudelson and Hulubanche Kassa

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from July 11, 2026 through July 17, 2026.

 

 

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Broad-Leafed Woody Ornamentals

Plant:  Azalea
Disease/Disorder:  Pestalotiopsis Leaf Spot
Pathogen:  Pestalotiopsis sp.
County:  Dane

Plant:  Elm (Unspecified)
Disease/Disorder:  Dutch Elm Disease
Pathogen:  Ophiostoma sp.
County:  Racine

Plant:  Oak (Red)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Dane

Plant:  Oak (White)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Dane

Plant:  Oak (Unspecified)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Dane

Plant:  Oak (Unspecified)
Disease/Disorder:  Phomopsis Gall
Pathogen:  Phomopsis sp.
County:  Sawyer

Plant:  Pawpaw
Disease/Disorder:  Verticillium Wilt
Pathogen:  Verticillium sp.
County:  Dane

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Field Crops

Plant:  Corn
Disease/Disorder:  Northern Corn Leaf Blight
Pathogen:  Exserohilum turcicum
County:  Dane

Plant:  Soybean
Disease/Disorder:  Phytophthora Root and Stem Rot
Pathogen:  Phytophthora sp.
County:  Waushara

Plant:  Soybean
Disease/Disorder:  Rhizoctonia Root Rot
Pathogen:  Rhizoctonia sp.
County:  Waushara

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Forage Crops

Plant:  Italian Ryegrass
Disease/Disorder:  Alternaria Leaf Spot
Pathogen:  Alternaria sp.
County:  Dane

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Fruit Crops

Plant:  Grape
Disease/Disorder:  Phomopsis Cane and Leaf Spot/Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Jefferson

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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:  Milwaukee

Plant:  Pine (Limber)
Disease/Disorder:  White Pine Blister Rust
Pathogen:  Cronartium ribicola
County:  Dane

Plant:  Pine (White)
Disease/Disorder:  Schweinitzii Root and Butt Rot
Pathogen:  Phaeolus schweinitzii
County:  Dane

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

Plant:  Spruce (Unspecified)
Disease/Disorder:  Lirula Needle Blight
Pathogen:  Lirula sp.
County:  Eau Claire

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Vegetable Crops

Plant:  Cabbage (Napa)
Disease/Disorder:  Black Rot
Pathogen:  Xanthomonas campestris pv. campestris
County:  Waushara

Plant:  Cucumber
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum orbiculare
County:  Winnebago (IL)

Plant:  Onion
Disease/Disorder:  Leaf Spot
Pathogen:  Colletotrichum gloeosporioides
County:  Waushara

Plant:  Tomato
Disease/Disorder:  Septoria Leaf Spot (Suspected)
Pathogen:  Septoria lycopersici
County:  Brown

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Specialty Crops

No New Diseases

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Miscellaneous

No New Entries

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