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Herbicide Recommendations for Roadside Weed Control: Postemergence Grass and 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 Grass and 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. Amitrol for Canada thistle and perennial sow thistle
  3. Amitrol for milkweed, horsetail, toadflax, and quackgrass
  4. Glyphosate
  5. Other Roadside Weed Control Recommendations
  6. 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. Crop stage is important to optimize crop safety. Always use appropriate drift management technology

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Amitrol for Canada thistle and perennial sow thistle
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 Canada thistle, perennial sow thistle.
  • Apply to the point of runoff when the thistles are in the head stage of growth.
  • Use spot treatments ONLY, since grasses are susceptible to this chemical and may be controlled for up to one season.

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Amitrol for milkweed, horsetail, toadflax, and quackgrass
Trade Name
Active Ingredient amitrole
Formulation 231 g/L
Rate per hectare (active) 4.5 to 6.75 kg/ha
Rate per hectare (product) 18.75 to 28 L/ha
Rate per acre (product) 7.5 to 11.2 L/ac

Precautions

  • For milkweed, spray to wet in early summer before flowering.
  • For horsetail, toadflax, and quackgrass.
  • Spray when horsetail is growing vigorously.
  • Use spot treatments ONLY, since grasses are susceptible to this chemical and may be controlled for up to one season.

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Glyphosate
Trade Name glyphosate

or glyphosate

 or glyphosate

or glyphosate
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)
2.52 to 4.32 kg/ha
2.52 to 4.32 kg/ha
2.52 to 4.32 kg/ha
2.52 to 4.32 kg/ha
Rate per hectare (product)
7 to 12 L/ha
5.25 to 9 L/ha
5 to 8.64 L/ha
4.67 to 8 L/ha
Rate per acre (product)
2.8 to 4.8 L/ac
2.1 to 3.6 L/ac
2 to 3.46 L/ac
1.87 to 3.2 L/ac

Precautions

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Related Links

For more information:
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E-mail: ag.info.omafra@ontario.ca