The Field Diagnostic Clinic will be offered on July 11, 2018 at the Field Extension Education Laboratory (FEEL) near Boone, Iowa. Registration check-in begins at 8:30 a.m. and opening comments are at 8:55 a.m. The program concludes at 4:00 p.m.

The Field Diagnostic Clinic focuses on identifying common issues within crop fields. Extension specialists will discuss diagnostic methods and skills, management options and decision making for future crops. This program is meant for new crop advisors as well as individuals interested in a diagnostics refresher.

Continuing Education

This clinic qualifies for 6 continuing education credits for Iowa Certified Crop Advisers, subject to board approval, in the following categories: 1.5 nutrient management, 3.5 pest management, 1.0 crop management.

What is FEEL?

FEEL is Iowa State University's 23-acre teaching and demonstration facility dedicated to providing a hands-on learning experience for crop production professionals. Demonstration plots are used to show management problems, solutions, and diagnostic challenges for corn and soybean production in Iowa. Modern, air conditioned classroom facilities support field demonstrations, all within walking distance.

Small classes offer each participant ample opportunity for discussion with instructors. Participants sharpen troubleshooting skills and evaluate management strategies through direct experience with actual crop problems.

Clinic attendees may purchase a copy of A Farmer's Guide to Corn Diseases for $15, a 50% discount from the cover price. This 162-page color publication provides an overview of the corn diseases that currently occur in the United states and Canada, with an emphasis on diagnosing diseases in the field. Information for each disease includes symptoms and signs, conditions that favor disease, similar looking diseases and disorders, and a review of basic management options. The book also contains a diagnostic key and disease distribution maps. A Farmer’s Guide to Corn Diseases was developed by Iowa State University in partnership with several other universities.

Clinic topics

The topics below are currently scheduled for the Field Diagnostic Clinic. Iowa State University reserves the right to adjust the program due to speaker availability and growing conditions.

Nutrient deficiency symptoms and fertilizer injury in the field
John Sawyer, professor, Agronomy and Extension soil fertility and nutrient management specialist
John will show common symptoms of nutrient deficiencies in our demonstration plots, as well as a presentation that shows symptoms that aren’t showing well in the field. He will walk everyone through fertilizer injury demonstration plots and explain how they may affect the crop. (1.0 NM)

A spot is a spot. Or is it? – Diagnosing corn and soybean diseases
Alison Robertson, professor, Planth Pathology and Microbiology and Extension crop plant pathologist
Disease symptoms can be hard to distinguish and can easily be confused with other injury symptoms. Alison will explain how she differentiates between disease that look similar and some injury that can be confused for disease. (1.0 PM)

Herbicide injury Identification
Bob Hartzler, professor, Agronomy and Extension weed management specialist
Issues with herbicide application and carryover may lead to injury symptoms in the field. Bob will teach what to look for to identify these injury symptoms using common issues that occur in the field. He will also discuss how these injuries may affect crop yield and management. (1.0 PM)

Soybeans: What went right and what’s gone wrong?
Mark Licht, assistant professor, Agronomy and Extension cropping systems specialist
We plant our demonstration plots with a goal of causing problems that occur in crop fields across the state. Mark will show some of these issues and discuss other issues that may be occurring in fields. (0.5 CM)

Weed identification: Weeds emerging throughout the season
Bob Hartzler, professor, Agronomy and Extension weed management specialist
Many weeds emerge throughout the year and may appear different at various stages of growth. Bob will show a few weed species planted at various times throughout the season and explain differences between the species. (0.5 PM)

Disease Diagnosis Challenge
Alison Robertson, professor, Planth Pathology and Microbiology and Extension crop plant pathologist
Alison will review disease identification using a Kahoot quiz. Everyone will have the opportunity to identify a disease from options, then Alison will explain the correct answer and the key symptoms she used to identify the disease. (0.5 PM)

Soil and tissue sampling in crops
Antonio Mallarino, professor, Agronomy and Extension soil fertility and nutrient management specialist
Soil and tissue sampling need to be performed properly for accurate results that can be used for crop management decisions. Antonio will give tips for soil sampling and recommendations for tissue sampling at various crop stages. (0.5 NM)

Issues in corn to be looking for this summer
Mark Licht, assistant professor, Agronomy and Extension cropping systems specialist
Corn has many challenges throughout the growing season including issues with planting, weather and pests. Mark will show some of our mistake plots and the issues that they may cause. He will discuss other challenges related to the weather this season. (0.5 CM)

Corn rootworm injury ratings
Angie Rieck-Hinz, Extension Field Agronomist
Corn rootworm injury limits water and nutrient uptake, leading to yield loss and other issues. Angie will show how to rate rootworm injury and discuss some management decisions based on this injury. (0.5 PM)

Registration Instructions

Early registration – $125 (prior to midnight, June 29, 2018)

Late registration – $150 (prior to midnight, July 6, 2018)

Advance registration is required to attend this clinic. Registrations must be received by midnight, July 6, 2018. Space is limited for FEEL clinics. Registrations are accepted on a first-paid basis. If the clinic fills notice will be provided on this web page.

Registration includes refreshments, lunch, course materials and publications.

Cancelations requesting a refund must be received by midnight, July 6, 2018. Please call (515) 294-6429 or email to cancel a registration.

Registration may be completed online using VISA, MasterCard or Discover, or by mailing in the completed registration form with check payment. Phone registrations are not accepted.

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

For additional information regarding this and other FEEL programs please contact Warren Pierson, FEEL coordinator, at or (515) 509-8308.


Directions and lodging

The clinic is held at the Field Extension Education Laboratory (FEEL), 1928 240th Street, Boone, Iowa. A printable copy of driving instructions, map and contact information is linked below.

Overnight accomodations, if needed, are the responsibility of the clinic attendee. A wide range of hotels are available in nearby Boone and Ames. For a complete listing visit the Ames Convention and Visitors Bureau link below.