Agronomy and Horticulture Department

 

Auxin and Auxinic Herbicide Mechanism(s) of Action, Part 1: Introduction

Date of this Version

2004

Document Type

Article

Citation

Plant and Soil Sciences eLibrary (PASSeL) Lessons.

This manuscript has been assigned Journal Series No. 03-12, College of Agricultural Sciences and Natural Resources, University of Nebraska.

Comments

Copyright 2004, the authors. Used by permission.

Peer-reviewed web lesson, JNRLSE approved, 2004.

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) and the New Mexico State University Agricultural Experiment Station. Any opinions, findings, conclusions or recommendations expressed in this publication are those of the authors and do not necessarily reflect the view of the U.S. Department of Agriculture.

Abstract

Overview:

The selective control of broadleaf weeds in cereal grain crops by auxinic herbicides has made this group one of the most widespread and important herbicide families in use. These herbicides were the first organic herbicides developed that were selective or able to kill one group of plants, but not another (i.e. kill broadleaf, but not grass plants). This lesson will introduce the major features of these herbicides, discuss their major uses and describe the symptoms of the injury they cause as well as introduce how they kill sensitive plants.

Objectives:

At the completion of this lesson, students will be able to:

  1. Identify the four major classes of auxinic herbicides and their characteristics.
  2. Understand the selective nature of this group of herbicides.
  3. Describe how auxinic herbicides mimic the natural plant hormone, auxin and act in plants.
  4. Recognize the major damage symptoms caused by auxinic herbicides in broadleaf and grass plants.

Modules:

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