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Herbicide Recommendations for Roadside Weed Control: Postemergence Broadleaf Herbicides

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 20 June 2008

Pub 75: Guide to Weed Control > Roadsides and Non-Crop Areas > Herbicide Recommendations for Roadside Weed Control: Postemergence Broadleaf Herbicides


Excerpt from 2008 Chapter 18, Publication 75, Guide to Weed Control, Order this publication

Cover of Publication 75, Guide to Weed ControlTable of Contents

  1. Introduction
  2. 2,4-D
  3. Diphenoprop, Desormone, Estaprop or Dichlorprop
  4. Garlon 4
  5. Milestone
  6. Milestone + 2,4-D Amine
  7. Telar
  8. Tordon 101
  9. Transline
  10. Vanquish for leafy and cypress spurge
  11. Vanquish for goldenrod and field bindweed
  12. Vanquish for Canada thistle and perennial sow-thistle.
  13. Roadsides & Brush Control Herbicide Rating Tables
    • Susceptibility of Woody Plants to Various Herbicides & Mixtures as Foliage Sprays (Table 18-1) (PDF 51k)
    • Classification of Weeds According to Response to Various Foliage Sprays (Table 18-2) (PDF 62k)
  14. Other Roadside Weed Control Recommendations
  15. Related Links

 

Introduction

Postemergence - Leaf stage of the weeds is critical for good weed control. Smaller weeds are generally easier to kill but there needs to be enough leaf surface to intercept the herbicide. Apply according to recommended leaf stages. Always use appropriate drift management technology.

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2,4-D
Trade Name

or 2,4-D

or 2,4-D
Active Ingredient
2,4-D
or 2,4-D
or 2,4-D
Formulation
470 g/L
564 g/L
660 g/L
Rate per hectare (active)
1.1 kg/ha
1.1 kg/ha
1.1 kg/ha
Rate per hectare (product)
2.2 L/ha
1.95 L/ha
1.67 L/ha
Rate per acre (product)
0.9 L/ac
0.78 L/ac
0.67 L/ac

Precautions

  • Apply as the amine or low-volatile ester in 200-300 L/ha water (80-120 L/ac) in early summer. See Table 19-1 for weed susceptibilities for 2,4-D mixtures.

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Diphenoprop or Desormone or Estaprop or Dichlorprop or Turboprop 600
Trade Name
Active Ingredient
dichlorprop / 2,4-D
or dichlorprop / 2,4-D
or dichlorprop / 2,4-D
or dichlorprop / 2,4-D
or dichlorprop / 2,4-D
Formulation
679 g/L
680 g/L
582 g/L
582 g/L
582 g/L
Rate per hectare (active)
2.375kg/ha
2.375kg/ha
2.375kg/ha
2.375kg/ha
2.375kg/ha
Rate per hectare (product)
3.5 L/ha
3.5 L/ha
4 L/ha
4 L/ha
4 L/ha
Rate per acre (product)
1.4 L/ac
1.4 L/ac
1.6 L/ac
1.6 L/ac
1.6 L/ac

Precautions

  • Apply as the low-volatile ester in 200-500 L/ha water (80-200 L/ac) during early summer for most species.

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Garlon 4
Trade Name
Active Ingredient triclopyr
Formulation 480 g/L
Rate per hectare (active) 0.48 to 1.92 kg/ha
Rate per hectare (product) 1 to 4 L/ha
Rate per acre (product) 0.4 to 1.6 L/ac

Precautions

  • Apply in 200-300 L/ha water (80-120 L/ac) when weeds are actively growing.

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Milestone
Trade Name Milestone
Active Ingredient aminopyralid
Formulation 240 g/L
Rate per hectare (active) 60 to 120 g/ha
Rate per hectare (product) 0.25 to 0.5 L/ha
Rate per acre (product) 0.10 to 0.20 L/ac

Precautions

  • Apply POST.
  • Will control: Absinth (Biennial) Wormwood, Goldenrod, Knapweed, Scentless Chamomile, Canada Thistle, Yellow Star Thistle, Musk (nodding) Thistle, Sulphur Cinquefoil and Tropical Soda Apple.
  • Will supress: Common tansy and Dandelion.

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Milestone + 2,4-D Amine
Trade Name
Active Ingredient
aminopyralid
+ 2,4-D Amine*
Formulation
240 g/L
564 g/L
Rate per hectare (active)
60 to 120 g/ha
840 to 1440 g/ha
Rate per hectare (product)
0.25 to 0.5 L/ha
1.49 to 2.55 L.ha
Rate per acre (product)
0.10 to 0.20 L/ac
0.596 to 1.02 L/ac

Precautions

  • Apply POST.
  • For wider spectrum of weed control, 2,4-D amine may be added at a ratio of 1 part Milestone ai/ha to 12 parts 2,4-D amine ai/ha.

* see Table 4-1 for formulations available.

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Telar
Trade Name
Active Ingredient chlorsulfuron
Formulation 75 DF
Rate per hectare (active) 53 g/ha
Rate per hectare (product) 75 g/ha
Rate per acre (product) 30 g/ac

Precautions

  • A surfactant should be added to improve control.

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Tordon 101
Trade Name
Active Ingredient picloram/2,4-D
Formulation 305 g/L (1:3.7)
Rate per hectare (active) 2.14 kg/ha
Rate per hectare (product) 7 L/ha
Rate per acre (product) 2.8 L/ac

Precautions

  • Apply in 200 L/ha water (80 L/ac) during the spring or early summer after growth appears. Use an approved drift control additive or system.
  • A permit for purchase and use is required.

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Transline
Trade Name
Active Ingredient clopyralid
Formulation 360 g/L
Rate per hectare (active) 0.15 to 0.3 kg/ha
Rate per hectare (product) 0.42 to 0.83 L/ha
Rate per acre (product) 0.17 to 0.33 L/ac

Precautions

  • For Canada thistle, perennial sow thistle, spotted knapweed and coltsfoot.
  • Treat when weeds are young and actively growing.
  • For coltsfoot, treatments should be performed prior to August.
  • Apply as a broadcast foliar in 200 L/ha water (80 L/ac) or in sufficient water to ensure thorough coverage of target vegetation.
  • For spot treatment apply in 800 L and spray weeds to the point of run-off.

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Vanquish or Oracle for leafy and cypress spurge
Trade Name
Active Ingredient
dicamba
or dicamba
Formulation
480 g/L
480 g/L
Rate per hectare (active)
0.6 kg/ha
0.6 kg/ha
Rate per hectare (product)
1.25 L/ha
1.25 L/ha
Rate per acre (product)
0.5 L/ac
0.5 L/ac

Precautions

  • For leafy and cypress spurge. Apply when weed is actively growing in 100-200 L/ha water (40-80 L/ac).

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Vanquish for goldenrod and field bindweed
Trade Name
Active Ingredient
dicamba
or dicamba
Formulation
480 g/L
480 g/L
Rate per hectare (active)
1.1 kg/ha
1.1 kg/ha
Rate per hectare (product)
2.3 L/ha
2.3 L/ha
Rate per acre (product)
0.9 L/ac
0.9 L/ac

Precautions

  • For goldenrod, apply when weed is actively growing in 100-200 L/ha water (40-80 L/ac).
  • For field bindweed, apply in mid June or when flowering.

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Vanquish for Canada thistle and perennial sow-thistle.
Trade Name
Active Ingredient
dicamba
or dicamba
Formulation
480 g/L
480 g/L
Rate per hectare (active)
1.36 kg/ha
1.36 kg/ha
Rate per hectare (product)
2.83 L/ha
2.83 L/ha
Rate per acre (product)
1.13 L/ac
1.13 L/ac

Precautions

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Related Links

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E-mail: ag.info.omafra@ontario.ca