Herbicide Recommendations for Corn: Preplant Burndown and Residual Control

Table of Contents

1. Introduction
2. Corn Herbicide Weed Control Ratings (Table 9-1) (PDF file - 84 kb)
   • Corn Herbicide Weed Control Ratings: Annual Grasses
   • Corn Herbicide Weed Control Ratings: Broadleaf Weeds
   • Corn Herbicide Weed Control Ratings: Perennial Weeds
3. Other Corn Weed Control Recommendations for Conventional Corn (Field, Seed and Sweet)
• Soil Applied Grass and Broadleaf Herbicides (Preemergence Timing Only)
• Soil Applied Tank-Mixes (Preemergence Timing Only)
• Soil Applied Broadleaf Herbicides (Preemergence Timing Only)
• Soil Applied and Early Postemergence Grass Herbicides
• Preemergence and Early Postemergence Grass and Broadleaf Herbicides
• Soil Applied and Early Postemergence Tank-Mixes (For Control of Grass and Broadleaf Weeds)
• Postemergence Grass Herbicides
• Postemergence Broadleaf Herbicides and Tank-Mixes (For Broadleaf Weed Control)
• Postemergence Tank Mixes (For Control of Grass and Broadleaf Weeds)
4. Corn Leaf Stages
5. Why is Early Season Weed Control so Important in Corn?
6. Related Links

Introduction

• Non-selective herbicides such as glyphosate and Gramoxone are used to control emerged weeds prior to no-till planting. Tank-mixing of a residual herbicide with glyphosate or Gramoxone can be used to improve application efficiency with a "one-pass" weed management program.
• Refer to Chapter 6, for preplant application rates for glyphosate and Gramoxone.
• It is also important to note that when targeting perennial weeds, the addition of a triazine-based herbicide (i.e. atrazine, Converge Pro, Primextra II Magnum) will reduce the level of activity achieved with glyphosate. Increasing the rate of glyphosate should overcome this antagonism.
  

Related Links

... on general Weed topics
... on weed identification, order OMAFRA Publication 505: Ontario Weeds
... on weed control, order OMAFRA Publication 75: Guide To Weed Control