Compiled by Brian Hudelson and Hulubanche Kassa

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from August 22, 2026 through August 28, 2026.

 

 

---

Broad-Leafed Woody Ornamentals

Plant:  Crabapple
Disease/Disorder:  Botryosphaeria Canker
Pathogen:  Botryosphaeria sp.
County:  Dane

Plant:  Maple (Unspecified)
Disease/Disorder:  Girdling Root (Suspected)
Pathogen:  None
County:  Dane

Plant:  Maple (Unspecified)
Disease/Disorder:  Overly Deep Planting
Pathogen:  None
County:  Dane

Plant:  Oak (Bur)
Disease/Disorder:  Oak Wilt
Pathogen:  Bretziella fagacearum
County:  Rock

Plant:  Oak (Red)
Disease/Disorder:  Chlorosis
Pathogen:  None
Counties:  Milwaukee, Waukesha

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

Plant:  Willow (Purple Osier)
Disease/Disorder:  Botryosphaeria Canker
Pathogen:  Botryosphaeria sp.
County:  Marathon

Plant:  Willow (Purple Osier)
Disease/Disorder:  Cytospora Canker
Pathogen:  Cytospora sp.
County:  Marathon

(Back To Menu)

---

Field Crops

Plant:  Corn (Field)
Disease/Disorder:  Drought Stress (Suspected)
Pathogen:  None
County:  Sauk

Plant:  Corn (Field)
Disease/Disorder:  Gray Leaf Spot
Pathogen:  Cercospora sp.
County:  Sauk

Plant:  Corn (Seed)
Disease/Disorder:  Common Rust
Pathogen:  Puccinia sorghi
County:  Grant

Plant:  Corn (Seed)
Disease/Disorder:  Gray Leaf Spot
Pathogen:  Cercospora sp.
County:  Grant

Plant:  Corn (Seed)
Disease/Disorder:  Norther Corn Leaf Blight
Pathogen:  Setosphaeria turcica 
County:  Grant

Plant:  Corn (Seed)
Disease/Disorder:  Purple Leaf Sheath
Pathogen:  None
County:  Grant

Plant:  Corn (Seed)
Disease/Disorder:  Southern Rust
Pathogen:  Puccinia polysora
County:  Grant

Plant:  Corn (Seed)
Disease/Disorder:  Drought Stress (Suspected)
Pathogen:  None
County:  Grant

(Back To Menu)

---

Forage Crops

No New Diseases

(Back To Menu)

---

Fruit Crops

No New Diseases

(Back To Menu)

---

Herbaceous Ornamentals

Plant:  Bulrush (Hard Stem)
Disease/Disorder:  Root Rot
Pathogen:  Fusarium sp.
County:  Rock

Plant:  Bulrush (Hard Stem)
Disease/Disorder:  Helminthosporium Leaf Spot
Pathogen:  Helminthosporium sp.
County:  Rock

Plant:  Bulrush (Hard Stem)
Disease/Disorder:  Septoria Leaf Spot
Pathogen:  Septoria sp.
County:  Rock

Plant:  Daisy (Unspecified)
Disease/Disorder:  Crown Gall
Pathogen:  Agrobacterium tumefaciens
County:  Ottawa (MI)

Plant:  Daisy (Unspecified)
Disease/Disorder:  Leafy Gall
Pathogen:  Rhodococcus facians
County:  Ottawa (MI)

Plant:  Hosta
Disease/Disorder:  Tobacco Rattle
Pathogen:  Tobacco rattle virus
County:  Buffalo

(Back To Menu)

---

Houseplants

No New Diseases

(Back To Menu)

---

Needled Woody Ornamentals

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

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

Plant:  Juniper
Disease/Disorder:  Cytospora Canker
Pathogen:  Cytospora sp.
County:  Kenosha

Plant:  Juniper
Disease/Disorder:  Diplodia Shoot Blight and Canker
Pathogen:  Diplodia sp.
County:  Rock

Plant:  Juniper
Disease/Disorder:  Gymnosporangium Rust
Pathogen:  Gymnosporangium sp.
County:  Kenosha

Plant:  Juniper
Disease/Disorder:  Phomopsis Tip Blight
Pathogen:  Phomopsis sp.
County:  Rock

(Back To Menu)

---

Vegetable Crops

Plant:  Carrot
Disease/Disorder:  Bacterial Leaf Blight
Pathogen:  Xanthomonas sp.
County:  Waushara

Plant:  Corn (Sweet)
Disease/Disorder:  Anthracnose Stalk Rot
Pathogen:  Colletotrichum graminicola
County:  Dodge (MN)

Plant:  Corn (Sweet)
Disease/Disorder:  Fusarium Stalk Rot
Pathogen:  Fusarium sp.
County:  Dodge (MN)

(Back To Menu)

---

Specialty Crops

No New Diseases

(Back To Menu)

---

Miscellaneous

No New Entries

(Back To Menu)

---