Chapter 20: MOA Part 5 – Seedling Root Growth Inhibitors

Deana Namuth-Covert; Amy Kohmetscher

Chapter 20: MOA Part 5 – Seedling Root Growth Inhibitors

Disclaimer:

The information and suggestions in this publication are intended to provide general guidelines for weed management in Ohio. Because of changing laws and regulations, Ohio State University Extension assumes no liability for the recommendations. The recommendations for using pesticides included in this guide are incomplete and should not serve as a substitute for pesticide labels. Complete instructions for the use of a specific pesticide are on the pesticide label. The pesticide user is responsible for applying pesticides according to label directions, as well as for problems that may arise through misapplication or misuse of the pesticide. Label changes, product cancellations, and changes in recommendations may have occurred since the publication of this guide. Check with your county Extension agent in agriculture if you are in doubt about a pesticide you plan to use. Trade names have been used in this guide for clarity, but do not constitute an endorsement by The Ohio State University, nor do they imply discrimination against other products.

Chapter Authors

Dr. Deana Namuth-Covert, Professor and Ms. Amy Kohmetscher, Instructional Designer

Ohio State – Agricultural Technical Institute

College of Food, Agricultural and Environmental Sciences

The Ohio State University

two soybean seedlings side by side. the left soybean seedling exhibits stunted roots — Figure 1. Pendimethalin effects on soybean. Notice the stunted root growth on the treated seedling on the left. (WSSA Group 3 –MAI (HRAC Group K1). Image from Rebekah D. Wallace, University of Georgia, Bugwood.org.

A plant’s growth is dependent on the cell division process called mitosis. Both roots and shoots have meristematic tissue at their tips where rapid cell division and growth occurs. Herbicides in the Seedling Root Growth Inhibitors Mode of Action class interfere with this vital process. This final chapter will discuss the details of this class of herbicides.

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