Herbicide Recommendations for Soybeans: Pre-Plant Burndown Herbicides

Excerpt from 2008 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 iQ) + Classic
4. Soybean Herbicide Weed Control Ratings (Table 11-1) (PDF file - 21kb)
   • 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
   
   

8. 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.

    

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   Cleanstart Plus¹ (Credit Plus + Aim EC)

   Trade Name	Credit Plus	+ Aim EC
   Active Ingredient	glyphosate	+ carfentrazone-ethyl
   Formulation	360 g/L	240 g/L
   Rate per hectare (active)	0.9 kg/ha	0.0175 kg/ha
   Rate per hectare (product)	2.5 L/ha	73 mL/ha
   Rate per acre (product)	1.0 L/ac	30 mL/ac

   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.
     

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   Guardian¹ (Touchdown iQ) + Classic

   Trade Name	Touchdown iQ	+ Classic
   Active Ingredient	glyphosate	+ chlorimuron-ethyl
   Formulation	360 g/L	25 DF
   Rate per hectare (active)	0.9 kg/ha	9 g/ha
   Rate per hectare (product)	2.5 L/ha	36 g/ha
   Rate per acre (product)	1 L/ac	14 g/ac

   Precautions

   • Apply as a PP burndown.
   • Some rotational restrictions apply (see Classic label and Table 4-3,).
   • Guardian is a co-pack of Touchdown iQ + Classic.
     

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   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

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