Plant Disease Diagnostics Clinic

Search

Skip to content

2023 PDDC Plant Disease Talks
2024 PDDC Monthly Disease Talk Registration Form
2024 PDDC Plant Disease Talks
2025 PDDC Monthly Disease Talk Registration Form
2026 PDDC Monthly Disease Talk Registration Form
2026 PDDC Plant Disease Talks
Ask the Experts: A Monthly Q&A Series
Building Block Plant Diseases
Clinic Overview
Clinic Overview
Clinic Staff
Contact Us
Customer Satisfaction Survey
Educational Programs for the General Public
Events Index
Fact Sheet Listing – All
Fact Sheet Listing – Diseases – Broad Leafed Woody Ornamental
Fact Sheet Listing – Diseases – Field and Forage
Fact Sheet Listing – Diseases – Fruit Crop
Fact Sheet Listing – Diseases – Herbaceous Ornamental
Fact Sheet Listing – Diseases – Needled Woody Ornamental
Fact Sheet Listing – Diseases – Specialty Crop
Fact Sheet Listing – Diseases – Vegetable
Fact Sheet Listing – General Horticulture/Weeds
Fact Sheet Listing – Insect
Fact Sheet Listing – Miscellaneous
Fact Sheet Listing – Turf
General Sample Collection
Homepage
IPM Scout School Slides
Limerickettsia Book
Limerickettsia Book Order Form
Links
Mailing a Sample in Wisconsin
Mailing in an Out-of-State Sample
Monthly Column Index
Outreach Overview
Plant Disease Pointers Column Index
Sample Collection and Submission
Scientific Publications
Search Fact Sheets
Services & Fees
Site Index
Special Sample Collection
Submit a Digital Photograph for Diagnosis
Television and Radio
Testimonials
Tuber Sampling for Bacterial Ring Rot Testing
UW Plant Disease Facts Medallion Project
UW Plant Disease Facts Medallion Project Quizzes
Where’d It Go?
Wisconsin Disease Almanac 2013
Wisconsin Disease Almanac 2014
Wisconsin Disease Almanac 2015
Wisconsin Disease Almanac 2016
Wisconsin Disease Almanac 2017
Wisconsin Disease Almanac 2018
Wisconsin Disease Almanac 2019
Wisconsin Disease Almanac 2020
Wisconsin Disease Almanac 2021
Wisconsin Disease Almanac 2022
Wisconsin Disease Almanac 2023
Wisconsin Disease Almanac 2024
Wisconsin Disease Almanac 2025
Wisconsin Disease Almanac 2026
Wisconsin Disease Almanac Index
Wisconsin Hort Update Archive

Search for:

Bitter_Pit_and_Cork_Spot_216_x_216

July 11, 2014 216 × 216 Bitter_Pit_and_Cork_Spot_216_x_216

An apple with symptoms of bitter pit.

An apple with symptoms of bitter pit.

University of Wisconsin-Madison

University of Wisconsin-Madison

– popular destination

Note: The menu links below open content in the same tab. Links in the content area at the right open content in a new tab.

Learn About Us:

Clinic Overview

Diagnostic Services

Get a Diagnosis:

Submit Digital Photograph
Submit Physical Sample

Outreach/
Education

Watch Talks & Workshops:

Ask the Experts Talks
Monthly Plant Disease Talks
Events
Book a Talk for Your Group

Watch Courses:

Fundamentals of Plant Diseases
IPM Scout School – Diseases of Field and Forage Crops

Watch/Listen to Media:

Brian on Wisconsin Public Radio
Brian on Wisconsin Public Television

Read/Listen to Resources:

Limerickettsia Book
Monthly Notes (Blog)
Plant Disease Fact Sheets
Plant Disease Pointers (Blog)
Scientific Publications
Wisconsin Hort Update Archive (Podcast)

Test Your Knowledge:

Disease Quizzes – Earn Medallions

Read Disease Stats:

Wisconsin Disease Almanac

Resources for Kids:

Building Block Plant Diseases

Visit Other Related Websites:

Links

Social Media

(aka “X”)

University of Wisconsin-Madison

Website feedback, questions or
accessibility issues:

hudelson@wisc.edu.

© 2026 Board of Regents of the University of Wisconsin System.

Plant Disease Diagnostic Clinic

1630 Linden Dr. Room 183

Madison, Wisconsin 53706

608-262-2863

View Hours, Directions, Map

UW-Madison College of Agricultural and Life Sciences
UW-Madison Department of Plant Pathology

Accessibility questions: Click here to send an email

Copyright © 2026 The Board of Regents of the University of Wisconsin System

Login Request Help Help Docs