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Herbicide Recommendations for Soybeans: Preharvest

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 10 May 2008

Pub 75: Guide to Weed Control > Soybeans > Herbicide Recommendations for Soybeans: Preharvest

Excerpt from 2008 Chapter 11, Publication 75, Guide to Weed Control, Order this publication

Cover of Publication 75, Guide to Weed ControlTable of Contents

  1. Aim EC + non-ionic surfactant or Merge
  2. Reglone Dessicant + Agral 90
  3. Glyphosate
  4. Soybean Herbicide Weed Control Ratings (Table 11-1) (PDF file - 133 kb)
  5. Other Soybean Weed Control Recommendations
  6. Stages of Soybean Leaf Development
  7. Related Links
Aim EC + non - ionic surfactant or Merge
Trade Name
+ non-ionic surfactant
or Merge
Active Ingredient
carfentrazone-ethyl
+ non-ionic surfactant
or surfactant/solvent
Formulation
240 g/L
 
 
Rate per hectare (active)
0.0175 to 0.028 kg/ha
0.25% v/v
0.1% v/v
Rate per hectare (product)
0.073 to 0.117 L/ha
2.5 L/1,000L
10 L/1,000
Rate per acre (product)
30 to 47 mL/ac
2.5 L/1,000L
10 L/1,000L

Precautions

  • Apply to actively growing weeds, up to 10cm
  • Coverage of weed and crop foliage is essential for control
  • Preharvest interval (PHI) is 3 days.

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Reglone Dessicant + Agral 90
Trade Name
Active Ingredient
diquat
+ surfactant
Formulation
240 g/L
 
Rate per hectare (active)
0.30 to 0.55 kg/ha
0.1% v/v
Rate per hectare (product)
1.25 to 2.3 L/ha
1 L/1000 L
Rate per acre (product)
0.5 to 0.92 L/ac
1 L/1000 L

Precautions

  • Apply in 225 L/ha water to burn off weeds when 80% natural crop leaf defoliation has occurred and 80% of the pods have turned yellow.
  • Avoid regrowth by targeting spray within 7 days of variety maturity date and harvest 5-7 days after application.
  • For ground application use 1.25-1.7 L/ha (0.5-0.68 L/ac).
  • For aerial application use 1.7-2.3 L/ha (0.68-0.92 L/ac).
  • Beware of drift to adjacent crops or plants.

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Glyphosate
Trade Name
Active Ingredient
glyphosate
or glyphosate
or glyphosate
or glyphosate
Formulation
360 g/L
480 g/L
500 g/L
540 g/L
Rate per hectare (active)
0.9 kg/ha
0.9 kg/ha
0.9 kg/ha
0.9 kg/ha
Rate per hectare (product)
2.5 L/ha
1.875 L/ha
1.8 L/ha
1.67 L/ha
Rate per acre (product)
1 L/ac
0.75 L/ac
0.72 L/ac
0.67 L/ac

Precautions

  • Apply in 50-100 L/ha (20-40 L/ac) water when the crop is 30% grain moisture or less.
  • Do NOT apply to crops grown for seed.
  • Apply at least 7 days prior to harvest when pod tissue is dry and brown and 80-90% of original leaves have dropped.

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Related Links

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For more information:
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