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Extension > Minnesota Crop News > Herbicide Mode of Action and Crop Injury Symptoms at the University of Minnesota Field School for Ag Professionals

Wednesday, July 19, 2017

Herbicide Mode of Action and Crop Injury Symptoms at the University of Minnesota Field School for Ag Professionals

by Dave Nicolai, IAP Program Coordinator

This year at the Field School, participants will have two opportunities to learn, re-learn or fine-tune their skills in linking visual symptomology to the common herbicide modes of action commonly used in corn and soybean and gain in-depth knowledge of growth regulator herbicide movement and symptomology in soybean.

Weed management has changed dramatically in recent years. The large number of herbicide options—new products, old products with new names, new formulations of old products, premixes, and generics—can make weed control appear to be a difficult and confusing task. Knowing and understanding each herbicide’s mode of action is an important step in simplifying and selecting the proper herbicide for each crop, diagnosing herbicide injury, and designing a successful and durable weed management program for a farmer’s production system.

In 2017 and 2018, Farmers will have the option of applying recently labeled growth regulator herbicides to traited crops of corn and soybeans. Understanding and identifying the visual crop injury symptoms, which may occur on both conventional crops and crops with other herbicide traits is an important skill for ag professionals.

Understanding Herbicide Mode of Action is just one of numerous sessions which will be presented at the 2017 Field School for Ag Professionals July 27 - 28 at the University of Minnesota Agriculture Experiment Station, St. Paul Campus, University of Minnesota. Detailed session descriptions and online registration can be found on the Institute for Ag Professionals website by linking to


This in-field session on the day of the Field School will involve observing crop injury symptoms and integrating information from 10 different herbicides, representing eight different sites of action, sprayed across fourteen different crops of varying herbicide susceptibility.
  • Learn how different herbicides work and relate their site of action to their respective crop injury symptoms.
  • Learn to relate herbicide trade names to their respective site(s) of action.
  • Gain a better understanding of crop sensitivity to commonly used herbicides.
  • Learn how herbicide site of action relates to herbicide resistance management.


The goal of this session is that participants will gain a broader understanding of Enlist and Xtend soybean technology, while considering the consequences of misapplication of herbicides on the Enlist and Xtend soybeans. A good understanding of the herbicide specificity associated with the Enlist and Xtend soybean technology will greatly assist in preventing as well as diagnosing herbicide-induced crop injury complaints and will provide a better understanding of how to diversify a weed management program in response to herbicide resistant weed concerns.
  • Participants will utilize some of the learning gains from the Herbicide Mode of Action trial presented on Day 1 of the Field School to observe, identify and assess potential crop injury symptomology from several important herbicides that may potentially be used on either Enlist or Xtend soybean technologies.
  • Observe and understand the consequences of off-target movement of herbicides via spray drift and tank contamination management.

You may choose to attend either day or both, with a full range of Certified Crop Advisor CEU offerings available. The St. Paul campus, located in Falcon Heights, MN next to the Minnesota State Fairgrounds at Larpenteur and Gortner Ave.

Enrollment is limited to the first 120, with only limited space now available.
  • Attend either day: $190 per day
  • Attend both days: $340 + St. Paul Saints baseball ticket (if registered by July 21st)
    • $340 (if registered before July 21)
    • $380 (if registered after July 21)

When you register for both days, you will have the option to receive one complimentary ‘Outfield Reserved’ ticket to the St. Paul Saints baseball game at CHS Field located in downtown St. Paul for the 7:05 pm game against the Sioux City Explorers. Meals and transportation on your own.

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