Herbicide Recommendations for Soybeans: Pre-Plant Burndown Herbicides

Excerpt from 2010-11 Chapter 11, Publication 75, Guide to Weed Control, Order this publication

Table of Contents

1. Introduction
2. Cleanstart Plus¹ (Credit Plus + Aim EC)
3. Guardian¹ (Touchdown Total) + Classic
4. Soybean Herbicide Weed Control Ratings (Table 11-1) (PDF file - 59 kb)
   • Annual Grasses
   • Broadleaf Weeds
   • Perennial Weeds
5. Other Soybean Weed Control Recommendations
   • Soil Applied Grass Herbicides
   • Soil Applied Broadleaf Herbicides
   • Soil Applied Grass and Broadleaf Herbicides
   • Postemergence Grass Herbicides
   • Postemergence Broadleaf Herbicides
   • Postemergence Grass and Broadleaf Herbicides
   • Postemergence Grass and Broadleaf Herbicides - Roundup Ready (glyphosate tolerant) varieties only
   • Postemergence Tank-mix Options
   • Spot Treatment
   • Wick Wiper and Roller Application
   • Preharvest
6. Stages of Soybean Leaf Development
7. 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. Sencor, Lorox L) will reduce the level of activity achieved with glyphosate. Increasing the rate of glyphosate should overcome this antagonism.

Precautions

• Apply to actively growing weeds, up to 10cm
• Coverage of weed foliage is essential for control
• Only weeds emerged at application will be controlled.
• Cleanstart Plus1 provides no residual weed control.
• Cleanstart Plus1 is a co-pack of Credit Plus and Aim EC.
  

Precautions

• Apply as a PP burndown.
• Some rotational restrictions apply (see Classic label and Table 4-4,).
• Guardian is a co-pack of Touchdown Total + Classic.

Precautions

• Apply to coarse and medium textured soils.
• Apply to soybeans prior to planting or within 3 days after planting but prior to soybean emergence.
• Severe crop injury will result if applications are made to soybeans that begun to crack through the soil surface or have emerged.
• Do NOT within 100 metres of non-dormant pears.
• Do NOT tank-mix with DUAL II MAGNUM, BOUNDARY or FRONTIER MAX.
• Any tillage operation performed after application will reduce weed control.
• Apply only once per growing season.
  

Related Links

• Weeds in Ontario
• Soybeans in Ontario
• Problem Weed Control in Field Crops
• Integrated Pest Management (IPM)
• Pesticide Application and Safety
• Pesticide Companies and Agents
• OMAFRA Sprayer Calibration Calculator
• Search the PMRA website
• OMAFRA Publication 505: Ontario Weeds
• OMAFRA Publication 75: Guide To Weed Control