Preplant Weed Control: Preplant Site Preparation Prior To Any Crop


Pub 75: Guide to Weed Control > Preplant Weed Control > Preplant Site Preparation Prior To Any Crop

Excerpt from 2010-11 Chapter 6, Publication 75, Guide to Weed Control, Order this publication

Cover of Publication 75, Guide to Weed ControlTable of Contents

  1. Aim EC + Agral 90 or + Ag-Surf or + Merge
  2. Amitrol 240 for dandelions and annual weeds
  3. Amitrol 240 for quackgrass, Canada thistle, sow-thistle and annual weeds.
  4. Cleanstart Plus1 (Credit Plus + Aim EC)
  5. Glyphosate
  6. Gramoxone
  7. Gramoxone tank-mixes before corn or soybeans
  8. Guardian1 (Touchdown + Classic)
  9. Preplant and Postharvest Weed Control Tables
    • Non-Selective Herbicides Available for Preplant Site Preparation (Table 6-1) (PDF - 55 kb)
    • Preplant Herbicide Weed Control Ratings (Table 6-2) (PDF - 49 kb)
    • Postharvest Weed Control (Table 6-3) (PDF - 47 kb)
  10. Other Special Methods of Weed Control
  11. Related Links

Aim EC + Agral 90 or + Ag-Surf or + Merge

Trade Name
or + Merge
Active Ingredient
carfentrazone-ethyl
+ non-ionic surfactant
or + surfactant/solvent
Formulation
240 g/L
 
 
Rate per hectare (active)
8.9 to 28g/ha
0.25 % v/v
0.1 % v/v
Rate per hectare (product)
37 to 117 mL/ha
2.5 L/1000 L
1 L/1000 L
Rate per acre (product)
5 to 47 mL/ac
2.5 L/1000L
1 L/1000 L

Precautions

  • Apply to actively growing weed up to 10 cm tall.
  • Coverage of the weeds is essential for good control.
  • The preplant tank-mix of Aim EC + glyphosate (Cleanstart Plus1) will provide broader spectrum weed control.

1 Indicates herbicide sold as a co-pack under this trade name.

Amitrol 240 (for dandelions and annual weeds)
Trade Name
Active Ingredient amitrole
Formulation 231 g/L
Rate per hectare (active) 1 to 2 kg/ha
Rate per hectare (product) 4.2 to 8.4 L/ha
Rate per acre (product) 1.68 to 3.36 L/ac

Precautions

  • For dandelions and annual weeds.
  • For corn, soybeans, white beans, wheat, barley, canola and field peas.
  • Apply in 100-200 L/ha water (40-180 L/ac) 10-14 days before planting the crop.
  • Wait 10-14 days before tillage and planting (ONLY soybeans may be planted 6 days after application when applied at the low rate).
  • Use additional herbicide treatments to control weed species that emerge after application.
  • May be tank-mixed with Roundup or Pursuit where registered.
Amitrol 240 (for quackgrass, Canada thistle, sow thistle and annual weeds)
Trade Name
Active Ingredient amitrole
Formulation 231 g/L
Rate per hectare (active) 3 to 4 kg/ha
Rate per hectare (product) 12.5 to 16.5 L/ha
Rate per acre (product) 5 to 6.6 L/ac

Precautions

  • For quackgrass, Canada thistle, sow thistle (fall treatment) and annual weeds.
  • For use ONLY before white beans, corn and soybeans.
  • Apply in 100-200 L/ha water (40-180 L/ac).
  • Apply to actively growing weeds up to 10 cm tall in the fall (until heavy frost) or in spring.
  • Plow or thoroughly disk 10-14 days after application.
  • Cultivation may be required when the crop is emerged to improve weed control
Cleanstart Plus1 (Credit Plus + Aim EC)
Trade Name
Active Ingredient
glyphosate
+ carfentrazone-ethyl
Formulation
360 g/L
240 g/L
Rate per hectare (active)
0.9
+ 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 tall
  • 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.
Glyphosate*
Trade Name
Active Ingredient
glyphosate
Rate per hectare (active)
0.27 to 4.32 kg/ha
Rate per hectare (product)
Refer to Table 6-2
Rate per acre (product)
Refer to Table 6-2

Precautions

  • For specific information on product rate and notes for annual and perennial weed control, refer to Table 6-2. Preplant Herbicide Weed Control Ratings, page 79.|
Gramoxone
Trade Name
Active Ingredient paraquat
Formulation 200 g/L
Rate per hectare (active) 0.55 to 1.1 kg/ha
Rate per hectare (product) 2.75 to 5.5 L/ha
Rate per acre (product) 1.1 to 2.2 L/ac

Precautions

  • Apply to actively growing vegetation at least 3 days prior to crop emergence.
  • Use the high rate when weeds are above 5 cm in height.
  • Apply in 300-1100 L/ha water (120-440 L/ac).
  • Complete coverage is important. Use higher water volumes on dense vegetation.
  • Perennial weeds will only be suppressed.
  • Only emerged weeds will be controlled.
Gramoxone (Tank-mixes before corn or soybeans)
Trade Name
Active Ingredient paraquat
Formulation 200 g/L
Rate per hectare (active) 0.5 kg.ha
Rate per hectare (product) 2.5 L/ha
Rate per acre (product) 1 L/ac

Precautions

  • For use as a pre-plant burndown before no-till corn and soybean.
  • Apply to actively growing vegetation at least 3 days prior to crop emergence.
  • Apply in 200-250 L/ha water (80-100 L/ac).
  • Complete coverage is important. Use higher water volumes on dense vegetation.
  • Perennial weeds will only be suppressed.

Guardian1 (Touchdown Total + Classic)
Trade Name
Active Ingredient
glyphosate
+ chlorimuron-ethyl
Formulation
500 g/L
25 DF
Rate per hectare (active)
0.9 kg/ha
9 g/ha
Rate per hectare (product)
1.8 L/ha
+ 36 g/ha
Rate per acre (product)
0.72 L/ac
+ 14 g/ac

Precautions

  • Apply as a preplant burndown to soybeans ONLY.
  • Apply prior to emergence of conventional soybeans.
  • 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.


Related Links

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For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca
Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 30 January 2010