Herbicide Recommendations for Soybeans: Glyphosate Tolerant ("Roundup Ready") Soybean - Preplant Burndown Herbicides

Table of Contents

1. Preplant Burndown Herbicides
• Cleanstart Plus¹ (Credit Plus + Aim EC)
• Guardian¹ (Touchdown Total) + Classic
• Glyphosate + Valtera
2. Other Soybean Weed Control Recommendations
• Pre-Plant Burndown Herbicides
• Soil Applied Grass Herbicides
• Soil Applied Broadleaf Herbicides
• Soil Applied Grass and Broadleaf Herbicides
• Soil Applied Tank-mix Options
• Postemergence Grass Herbicides
• Postemergence Broadleaf Herbicides
• Postemergence Grass and Broadleaf Herbicides
• Postemergence Tank-mix Options
• Spot Treatment
• Wick Wiper and Roller Application
• Preharvest
3. Stages of Soybean Leaf Development
4. Related Links

Preplant Burndown Herbicides - Refer also to Chapter 6. Preplant & Postharvest Weed Control

• Non-selective herbicides such as glyphosate and GRAMAXONE are used to control emerged weeds prior to no-till planting. Tank-mixing of a residual herbicide with glyphosate or GRAMAXONE can be used to improve application efficiency with a "one-pass" weed management program.
• Refer to Chapter 6. Preplant & Postharvest Weed Control, for preplant application rates for glyphosate and GRAMAXONE.
• 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.
  

1 Indicates product sold as a co-pack.

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.

1 Indicates product sold as a co-pack.

Precautions

• Apply as a PP burndown.
• Some rotational restrictions apply (see Classic label and Table 4-4) Herbicide Crop Rotation and Soil pH Restrictions.
• Guardian is a co-pack of Touchdown Total + Classic.
• Other glyphosate products can be tank-mixed with CLASSIC, see Table 11-5. Glyphosate Products and "Two-Way" Postemergence Tank-Mixes For Use on Glyphosate Tolerant Soybean, for a complete list).
• CLASSIC can only be applied once per growing season.
  

* Numerous products exist, refer to Table 11-5. Glyphosate Products and "Two-Way" Postemergence Tank-Mixes For Use on Glyphosate Tolerant Soybean, for a complete list along with registered tank-mix partners.

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