Iowa State University agronomists and researchers have confirmed foliar diseases in many of Iowa’s corn and soybean fields. An important decision growers are facing is whether or not to apply fungicides. The combination of delayed planting and cooler growing season means some crops are entering the grain fill stages at a later dates than normal. These fields may be more susceptible to disease-related yield loss.

Iowa State University Extension and Outreach is offering a Crop Disease Clinic on August 15, 2019 at the Field Extension Education Laboratory near Boone, IA to address these concerns. Extension specialists will conduct sessions on crop disease identification, management and current research results. Attendees will have the opportunity to discuss challenges of the 2019 growing season and recommendations for this year’s crop. As crops diseases continue to develop and progress, how much yield loss can be expected and how much can still be protected?

Another important pest to consider when estimating yield potential is the impact of soybean cyst nematode (SCN). Often overlooked, SCN rarely shows above-ground symptoms and many farmers are unware the pest is present. Through this clinic learn more about identifying SCN infestations and protecting future crops.

The Crop Disease Clinic will benefit anyone with an interest in better understanding crop disease cycles, symptoms and treatment options. Participants will also learn how researchers gather data, estimate disease infestations and rate treatment efficacy. These tools will assist growers, consultants and agronomists in making effective crop management decisions.

Registration includes the ISU publications Corn Diseases, and Soybean Diseases.

Clinic registration is limited to 50 students for maximum student-instructor interaction and discussion.

Continuing education

This clinic qualifies for 5.5 pest management continuing education credits for Iowa Certified Crop Advisers.




August 15, 2019

Registration check-in 8:30 AM.
Program begins at 9:00 AM concludes at 3:30 PM.


Field Extension Education Laboratory
1928 240th St
Boone, IA 50036



8:30 am Registration and check-in
9:00 am

Soybean disease identification and management

Daren Mueller

Daren Mueller
extension crop plant pathologist, Iowa State University

Soybeans are currently showing numerous diseases and more will develop in the next few weeks. Daren will use samples from demonstration plots and plants from nearby fields to demonstrate using key symptoms to identify diseases in the field. The session will include a discussion on current management suggestions and fungicide application decisions.

10:10 am

Corn disease identification and management

Alison Robertson

Alison Robertson
extension crop plant pathologist, Iowa State University

The corn disease demonstration plots are very active this year and will continue to develop additional symptoms as the season progresses. Join Alison in these plots to learn key points for identification of common diseaes in corn. Alison will explain why these diseases were a problem this year, relating back to the environment, pathogens, and susceptible crops.

11:20 am

Nematode biology and management update

Greg Tylka

Greg Tylka
extension nematologist, Iowa State University

Soybean cyst nematode (SCN) has been managed well for the past two decades with resistant soybean varieties. However, research shows that SCN populations throughout Iowa are developing increased levels of reproduction on many of the resistant soybean varieties. Greg will share recent research results and discuss the effectiveness of resistant varieties, seed treatments, and other options for available for SCN management.

12:15 pm Lunch (provided)
12:45 pm

Graduate student research update

Iowa State University graduate students and post-docs have numerous on-going research projects in the field and greenhouse. They will be sharing what they’re researching, what they’re looking for, and what they’ve seen so far.

1:40 pm

Disease note taking

Alison Robertson

Alison Robertson
extension crop plant pathologist, Iowa State University

Daren Mueller

Daren Mueller
extension crop plant pathologist, Iowa State University

Taking disease notes on research plots can be difficult and confusing. Alison will explain how she takes notes in her research plots including disease incidence and severity, and then relate this to observing diseases in production fields. In many cases people are not consistent and are prone to overestimate disease severity.

2:20 pm

Online resources and forecasting apps

Daren Mueller

Daren Mueller
extension crop plant pathologist, Iowa State University

The Crop Protection Network has many online resources regarding disease identification and management. There are also many apps that are being developed, including Sporecaster and Tarspotter. Social media and other connections are great ways to share what’s being observed in the field and learn what others in the area are finding.

3:30 pm Clinic adjourns


Pay by credit card


Registration, prior to midnight, August 9, 2019

Registration includes lunch, refreshment breaks, and course materials.



  • Pre-registration is required to attend this course. Registrations must be received prior to midnight, August 9, 2019.
  • Class size is limited to 50 and pre-registration is required to attend. Registrations accepted on a first-come, first-paid basis. Registration will be closed if the course reaches capacity.
  • Requests for refunds must be received prior to midnight, August 9, 2019. Substitutions will be allowed.
  • Confirmation of registration is sent via email. Please provide a valid email address when registering


John Sawyer

Warren Pierson
coordinator, Field Extension Education Laboratory
(515) 509-8308

For assistance with registration, receipts, cancellation or questions on the status of your registration please contact ANR Program Services at (515) 294-6429 or