All posts by hudelson

Wisconsin Disease Almanac – January 23, 2026

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from January 17, 2026 through January 123 2026.

 

 


Broad-Leafed Woody Ornamentals Icon

Broad-Leafed Woody Ornamentals

No New Diseases

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Field Crops Icon

Field Crops

No New Diseases

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Forage Crops Icon

Forage Crops

No New Diseases

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Fruit Crops Icon

Fruit Crops

No New Diseases

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Herbaceous Ornamentals Icon

Herbaceous Ornamentals

Plant:  Bleeding Heart
Disease/Disorder:  Phytoplasma Disease
Pathogen:  Unspecified phytoplasma
County:  Ottawa (MI)

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Houseplants Icon

Houseplants

Plant:  Hibiscus
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum sp.
County:  Milwaukee

Plant:  Mandevilla
Disease/Disorder:  Anthracnose
Pathogen:  Colletotrichum sp./Glomerella sp.
County:  Milwaukee

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Needled Woody Ornamentals Icon

Needled Woody Ornamentals

No New Diseases

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Vegetable Crops Icon

Vegetable Crops

No New Diseases

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Specialty Crops Icon

Specialty Crops

No New Diseases

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Miscellaneous Icon

Miscellaneous

No New Entries

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Wisconsin Disease Almanac – January 16, 2026

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from January 10, 2026 through January 16, 2026.

 

 


Broad-Leafed Woody Ornamentals Icon

Broad-Leafed Woody Ornamentals

Plant:  Cottonwood
Disease/Disorder:  White Rot
Pathogen:  Cerioporus (Polyporus) squamosus
County:  Dane

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Field Crops Icon

Field Crops

No New Diseases

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Forage Crops Icon

Forage Crops

No New Diseases

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Fruit Crops Icon

Fruit Crops

No New Diseases

(Back To Menu)


Herbaceous Ornamentals Icon

Herbaceous Ornamentals

No New Diseases

(Back To Menu)


Houseplants Icon

Houseplants

No New Diseases

(Back To Menu)


Needled Woody Ornamentals Icon

Needled Woody Ornamentals

No New Diseases

(Back To Menu)


Vegetable Crops Icon

Vegetable Crops

No New Diseases

(Back To Menu)


Specialty Crops Icon

Specialty Crops

No New Diseases

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Miscellaneous Icon

Miscellaneous

No New Entries

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January 2026: What’s Cooking at the PDDC?

Sous Vide Water Bath IconIt’s the start of a new year, and I thought it might nice to provide an update on ongoing and new outreach projects that I’ve been working on at the PDDC.  For the past few of years, I’ve been focusing at least some of my efforts on developing educational resources that might be of interest to a youth audience (and quite frankly the child that still resides in all of us). 

Limerick Books

My initial attempt in this area was the publication of my plant disease-themed limerick book (“Limerickettsia:  A Plant Pathlogist’s Book of Verse”) back in 2023.  This book contains 52 plant disease-themed limericks, accompanying prose descriptions and photos of the diseases, and original custom artwork.  I’m currently working (albeit somewhat sporadically) on a sequel (tentatively titled “Sublimerick”) that will include limericks and other information on plant disease management.  I have about half of the limericks (and artwork) completed, but that leaves another 26 limericks to go.  I also need to track down and get permission for photos to use in the book.  That will definitely take some time and makes when the book might be published a bit difficult to predict. 

Plant Disease Medallions

Another of my youth-oriented projects has been my “UW Plant Disease Facts Medallion Project”.  I have almost 140 fact sheets in the “UW Plant Disease Facts” fact sheet series, and for each of those fact sheets, I have written a quiz, and designed a special electronic medallion.  You can read a fact sheet, take the corresponding quiz, and once you earn 100% on the quiz, you are emailed the corresponding medallion.  I know of some folks who have collected all 130+ medallions.  A new, exciting development with this project is that it looks like my department’s introductory plant pathology class will begin using the quizzes (and having students earn medallions) as part of its curriculum this fall.

Building Block Plant Diseases

My building block plant disease models have been fun to develop and offer to the public.  I currently have 10 building block plant disease kits, including kits for powdery mildew, apple scab, and black knot.  Information on the kits is available free of charge and downloadable from my clinic website.  Kits include instruction manuals (with a list of parts that you can purchase on your own), adult-friendly and kid-friendly fact sheets, and a word search puzzle for each disease.  Blossom end rot kits have been provided to every county Extension office in Wisconsin and were used back in 2024 as part of a University of Wisconsin Division of Extension 4-H outreach program to teach youth and their families about tomatoes and their uses.  In addition, “What’s Eating My Plants (WEMP)”, the graduate student outreach group in my department (Plant Pathology) at the the UW-Madison has used this kit for youth outreach and education at local public libraries.  WEMP’s work was highlighted in the UW-Madison College of Agricultural & Life Sciences “Grow” magazine (with a photo of the blossom end rot model on the cover).  I have other models (e.g., aster yellows, black rot, brown rot, downy mildew) in development.  I just need to order parts (to make sure my designed models are buildable) and put together the supplemental written materials to complete the kits.

Phytopath-opoly 

My most recent youth-oriented outreach project (started in late 2025 and continuing into 2026) is a plant disease-themed homage to Hasbro’s Monopoly©.  The game, dubbed “Phytopath-opoly”, is designed to teach people about plant diseases and their management.  The gameboard has spaces covering 24 plant diseases, spaces representing the major groups of disease-causing organisms (bacteria, fungi, nematodes, and viruses), and spaces for abiotic disorders, and non-disease oddities.  For diseases, you can apply control measures and eventually have a disease (really the affected plant) designated as “HEALTHY”.  There are “Diagnosis” and “Environment” spaces where, when you land on these spaces, you pick a card, learn a fun fact about a disease, and then earn a reward or are assessed a penalty.  There is also a special bonus component to the game. where after completing certain goals, there are building block minikits that players can build.  Vegetable seed packets representing different numbers of seeds are used as a substitute for money.  The game will include a binder of fact sheets describing the various diseases included in the game for players who want to learn more.  I have completed all of the graphic design elements, and I’m now working on written materials (e.g., rules, facts sheets, instruction manuals for the building block minikits).  I hope to have everything ready by the end of the year.  As with my building block plant disease kits, everything will be available for download (for free) from my clinic website. 

Want to See or Learn More?

If you are interested in seeing any of my youth-oriented work “in the flesh”, I encourage you to come visit the PDDC booth at the upcoming PBS Wisconsin Garden & Green Living Expo (February 13-15, 2026) in Madison.  I will have displays/information on all of my youth outreach projects (including a printout of my Phytopath-opoly gameboard) at the booth.  Also, I will be providing updates (as they become available) on my Facebook, Twitter (X) and Bluesky accounts (search for “UWPDDC” on all three platforms), and via my clinic listserv (UWPDDCLearn).  Email me at pddc@wisc.edu to subscribe to the listserv.  Finally, you can always contact me directly for information by email or by phone at (608) 262-2863.

Happy New Year!  And, keep on learning!

Wisconsin Disease Almanac – January 9, 2026

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from January 3, 2026 through January 9, 2026.

 

 


Broad-Leafed Woody Ornamentals Icon

Broad-Leafed Woody Ornamentals

No New Diseases

(Back To Menu)


Field Crops Icon

Field Crops

No New Diseases

(Back To Menu)


Forage Crops Icon

Forage Crops

No New Diseases

(Back To Menu)


Fruit Crops Icon

Fruit Crops

No New Diseases

(Back To Menu)


Herbaceous Ornamentals Icon

Herbaceous Ornamentals

No New Diseases

(Back To Menu)


Houseplants Icon

Houseplants

No New Diseases

(Back To Menu)


Needled Woody Ornamentals Icon

Needled Woody Ornamentals

Plant:  Pine (White)
Disease/Disorder:  Chlorosis (Suspected)
Pathogen:  None
County:  Dane

Plant:  Pine (White)
Disease/Disorder:  Sooty Mold 
Pathogen:  Miscellaneous sooty mold fungi
County:  Dane

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Vegetable Crops Icon

Vegetable Crops

No New Diseases

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Specialty Crops Icon

Specialty Crops

No New Diseases

(Back To Menu)


Miscellaneous Icon

Miscellaneous

No New Entries

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Wisconsin Disease Almanac – January 2, 2026

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from December 27, 2025 through January 2, 2026.

 

 


Broad-Leafed Woody Ornamentals Icon

Broad-Leafed Woody Ornamentals

Plant:  Maple (Japanese)
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Dane

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Field Crops Icon

Field Crops

No New Diseases

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Forage Crops Icon

Forage Crops

No New Diseases

(Back To Menu)


Fruit Crops Icon

Fruit Crops

No New Diseases

(Back To Menu)


Herbaceous Ornamentals Icon

Herbaceous Ornamentals

No New Diseases

(Back To Menu)


Houseplants Icon

Houseplants

No New Diseases

(Back To Menu)


Needled Woody Ornamentals Icon

Needled Woody Ornamentals

No New Diseases

(Back To Menu)


Vegetable Crops Icon

Vegetable Crops

No New Diseases

(Back To Menu)


Specialty Crops Icon

Specialty Crops

No New Diseases

(Back To Menu)


Miscellaneous Icon

Miscellaneous

No New Entries

(Back To Menu)


 

Wisconsin Disease Almanac – December 19, 2025

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from December 13, 2025 through December 19, 2025.

 

 


Broad-Leafed Woody Ornamentals Icon

Broad-Leafed Woody Ornamentals

No New Diseases

(Back To Menu)


Field Crops Icon

Field Crops

No New Diseases

(Back To Menu)


Forage Crops Icon

Forage Crops

No New Diseases

(Back To Menu)


Fruit Crops Icon

Fruit Crops

No New Diseases

(Back To Menu)


Herbaceous Ornamentals Icon

Herbaceous Ornamentals

Plant:  Dahlia
Disease/Disorder:  Crown Gall
Pathogen:  Agrobacterium tumefaciens
County:  Warren (NY)

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

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Houseplants Icon

Houseplants

No New Diseases

(Back To Menu)


Needled Woody Ornamentals Icon

Needled Woody Ornamentals

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

Plant:  Juniper 
Disease/Disorder:  Sphaeropsis Canker
Pathogen:  Sphaeropsis sp.
County:  Dane

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Vegetable Crops Icon

Vegetable Crops

No New Diseases

(Back To Menu)


Specialty Crops Icon

Specialty Crops

No New Diseases

(Back To Menu)


Miscellaneous Icon

Miscellaneous

No New Entries

(Back To Menu)


 

Wisconsin Disease Almanac – December 12, 2025

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from December 6, 2025 through December 12, 2025.

 

 


Broad-Leafed Woody Ornamentals Icon

Broad-Leafed Woody Ornamentals

Plant:  Boxwood
Disease/Disorder:  Fusarium Canker
Pathogen:  Fusarium sp.
County:  Waukesha

Plant:  Boxwood
Disease/Disorder:  Volutella Canker
Pathogen:  Volutella sp.
Counties:  Milwaukee, Waukesha

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

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Field Crops Icon

Field Crops

No New Diseases

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Forage Crops Icon

Forage Crops

No New Diseases

(Back To Menu)


Fruit Crops Icon

Fruit Crops

Plant:  Raspberry
Disease/Disorder:  Root/Crown Rot
Pathogen:  Rhizoctonia sp.
County:  Dane

Plant:  Strawberry
Disease/Disorder:  Phomopsis Leaf Blotch
Pathogen:  Phomopsis sp.
County:  Dane

Plant:  Strawberry
Disease/Disorder:  Root Rot
Pathogens:  Phytophthora sp., Pythium sp.
County:  Dane

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Herbaceous Ornamentals Icon

Herbaceous Ornamentals

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

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Houseplants Icon

Houseplants

No New Diseases

(Back To Menu)


Needled Woody Ornamentals Icon

Needled Woody Ornamentals

No New Diseases

(Back To Menu)


Vegetable Crops Icon

Vegetable Crops

No New Diseases

(Back To Menu)


Specialty Crops Icon

Specialty Crops

No New Diseases

(Back To Menu)


Miscellaneous Icon

Miscellaneous

No New Entries

(Back To Menu)


 

Wisconsin Disease Almanac – December 5, 2025

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Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from November 29, 2025 through December 5, 2025.

 

 


Broad-Leafed Woody Ornamentals Icon

Broad-Leafed Woody Ornamentals

No New Diseases

(Back To Menu)


Field Crops Icon

Field Crops

No New Diseases

(Back To Menu)


Forage Crops Icon

Forage Crops

No New Diseases

(Back To Menu)


Fruit Crops Icon

Fruit Crops

No New Diseases

(Back To Menu)


Herbaceous Ornamentals Icon

Herbaceous Ornamentals

No New Diseases

(Back To Menu)


Houseplants Icon

Houseplants

No New Diseases

(Back To Menu)


Needled Woody Ornamentals Icon

Needled Woody Ornamentals

Plant:  Spruce (Unspecified)
Disease/Disorder:  Fertility Issues (Suspected)
Pathogen:  None
County:  Kenosha

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

Plant:  Spruce (Unspecified)
Disease/Disorder:  Spruce Needle Drop
Pathogen:  Setomelanomma holmii
County:  Kenosha

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Vegetable Crops Icon

Vegetable Crops

No New Diseases

(Back To Menu)


Specialty Crops Icon

Specialty Crops

No New Diseases

(Back To Menu)


Miscellaneous Icon

Miscellaneous

No New Entries

(Back To Menu)


 

Wisconsin Disease Almanac – November 28, 2025

No Date Icon

Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from November 22, 2025 through November 28, 2025.

 

 


Broad-Leafed Woody Ornamentals Icon

Broad-Leafed Woody Ornamentals

No New Diseases

(Back To Menu)


Field Crops Icon

Field Crops

No New Diseases

(Back To Menu)


Forage Crops Icon

Forage Crops

No New Diseases

(Back To Menu)


Fruit Crops Icon

Fruit Crops

No New Diseases

(Back To Menu)


Herbaceous Ornamentals Icon

Herbaceous Ornamentals

No New Diseases

(Back To Menu)


Houseplants Icon

Houseplants

No New Diseases

(Back To Menu)


Needled Woody Ornamentals Icon

Needled Woody Ornamentals

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

Plant:  Spruce (Norway)
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Waukesha

(Back To Menu)


Vegetable Crops Icon

Vegetable Crops

No New Diseases

(Back To Menu)


Specialty Crops Icon

Specialty Crops

No New Diseases

(Back To Menu)


Miscellaneous Icon

Miscellaneous

No New Entries

(Back To Menu)


 

Wisconsin Disease Almanac – November 21, 2025

No Date Icon

Compiled by Brian Hudelson and Dante Tauscheck

The following diseases/disorders were identified at the Plant Disease Diagnostics Clinic from November 15, 2025 through November 21, 2025.

 

 


Broad-Leafed Woody Ornamentals Icon

Broad-Leafed Woody Ornamentals

Plant:  Oak (Bur)
Disease/Disorder:  Phomopsis Canker
Pathogen:  Phomopsis sp.
County:  Waukesha

Plant:  Oak (Unspecified)
Disease/Disorder:  Phytophthora Root Rot
Pathogen:  Phytophthora sp.
County:  Waukesha

(Back To Menu)


Field Crops Icon

Field Crops

No New Diseases

(Back To Menu)


Forage Crops Icon

Forage Crops

No New Diseases

(Back To Menu)


Fruit Crops Icon

Fruit Crops

No New Diseases

(Back To Menu)


Herbaceous Ornamentals Icon

Herbaceous Ornamentals

Plant:  Goat’s Beard
Disease/Disorder:  Crown Gall
Pathogen:  Agrobacterium tumefaciens
County:  Ottawa (MI)

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Houseplants Icon

Houseplants

No New Diseases

(Back To Menu)


Needled Woody Ornamentals Icon

Needled Woody Ornamentals

No New Diseases

(Back To Menu)


Vegetable Crops Icon

Vegetable Crops

Plant:  Potato
Disease/Disorder:  Bacterial Soft Rot
Pathogen:  Pectobacterium carotovorum subsp. carotovorum, Pectobacterium parmentieri
County:  Pulaski (IN)

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Specialty Crops Icon

Specialty Crops

No New Diseases

(Back To Menu)


Miscellaneous Icon

Miscellaneous

No New Entries

(Back To Menu)