Agronomy and Horticulture Department

 

Title

Herbicide Classification

Date of this Version

2004

Document Type

Article

Citation

Plant and Soil Sciences eLibrary (PASSeL) Lesson

Comments

Copyright © 2004 Brady Kappler and Deana Namuth. Used by permission.

This project was supported in part by the National Research Initiative Competitive Grants CAP project 2011-68002-30029 from the USDA National Institute of Food and Agriculture, administered by the University of California-Davis and by the National Science Foundation (NSF), Division of Undergraduate Education, National SMETE Digital Library Program, Award #0938034, administered by the University of Nebraska. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the USDA or NSF.

Development of this lesson was supported in part by the Cooperative State Research, Education, & Extension Service, U.S. Dept. of Agriculture under Agreement Number 00-34416-10368 administered by Cornell University and the American Distance Education Consortium (ADEC). Any opinions, findings, conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

Abstract

This lesson focuses on understanding the classification system into which herbicides are organized. Terms of classification, classification hierarchy, examples of classification, and a brief overview of the eight modes of action are all discussed in this lesson. Once this is understood it is much easier to grasp similar herbicides and know why they may exhibit certain symptoms to weeds and plants alike. Objectives: (1) Understand how herbicides are classified and why it is important for managing herbicide resistance; (2) Understand the importance of classification and herbicides by mode of action rather than chemical family; (3) Be able to tell the difference between mode of action and site of action; (4) Be able to differentiate between herbicide families, modes of action, and sites of action; and (5) Understand common name, trade names, and sites of absorption.

Overview

This lesson focuses on herbicide classification as a basis for understanding herbicide-plant interactions including herbicide resistance management. Plant and weed response to herbicides are characterized in the context of classification. The herbicide classification system will be examined and an overview of the eight herbicide mode of action groupings provided.

Objectives

1. Understand how herbicides are classified and why it is important for managing herbicide resistance.

2. Classify herbicides by mode of action rather than chemical family.

3. Know the difference between mode of action and site of action.

4. Differentiate between herbicide families, modes of action, and sites of action.

5. Understand common name, trade names, and sites of absorption.

Modules:

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