Herbicide Recommendations for Poison-Ivy Control: Postemergence


Pub 75: Guide to Weed Control > Roadsides and Non-Crop Areas > Herbicide Recommendations for Poison-Ivy Control: Postemergence


Excerpt from 2010-2011 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
  3. Arsenal
  4. Diphenoprop BK 700, or Estaprop, or Dichlorprop D or Turboprop 600
  5. Garlon 4
  6. Glyphosate
  7. Vanquish + 2,4-D
  8. Related Links

 

Introduction

Several chemicals have been shown to be effective for the control of poison-ivy. However, some growth may occur after treatment with any of these chemicals and retreatments will be necessary to achieve eradication. The chemical treatment of poison-ivy must take into account the location in which the weed is growing. If desirable shrubs or trees are present, avoid soil sterilants and use the other materials with caution.

A 9–14 L sprayer is the most convenient method of applying herbicides to patches of poison-ivy. Thorough coverage of the leaves with the spray is essential for maximum effect. After spraying, leave the area alone until the plants die, at which time gather and bury the dead stems. Even at this stage poisoning may be brought about by handling the dead plant. All treatments are most effective when the poison-ivy is in full leaf and growing actively, from about June 15–July 31.

Amitrol 240
Trade Name
Active Ingredient amitrole
Formulation 231 g/L
Rate per hectare (active) 2.25 kg/ha
Rate per hectare (product) 9.25 L/ha
Rate per acre (product) 3.7 L/ac

Precautions (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

  • Apply in at least 1,000 L/ha water (400 L/ac) when plants are actively growing. Thoroughly wet all foliage.
    Arsenal
    Trade Name
    Active Ingredient imazapyr
    Formulation 240 g/L
    Rate per hectare (active) 0.72 kg/ha
    Rate per hectare (product) 3 L/ha
    Rate per acre (product) 1.2 L/ac

Precautions (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

  • Apply in sufficient water (100-550 L/ha (40-220 L/ac)) to wet all foliage during periods of active growth.

      •  

      Diphenoprop BK 700, or Estaprop, or Dichlorprop D, or Turboprop 600
      Trade Name

      or
      Estaprop

      or Dichlorprop D
      Active Ingredient
      dichlorprop/2,4-D
      or dichlorprop/2,4-D
      or dichlorprop/2,4-D
      or dichlorprop/2,4-D
      Formulation
      679 g/L
      582 g/L
      582 g/L
      582 g/L
      Rate per hectare (active)
      6.8 kg/1,000 L
      6.8 kg/1,000 L
      6.8 kg/1,000 L
      6.8 kg/1,000 L
      Rate per hectare (product)
      10 L/1,000 L
      11.7 L/1,000 L
      11.7 L/1,000 L
      11.7 L/1,000 L

Precautions (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

  • Apply spray until foliage is thoroughly wet.
        • Garlon 4
        Trade Name
        Active Ingredient triclopyr
        Formulation 480 g/L
        Rate per hectare (active) 1.92 - 2.88 kg/ha
        Rate per hectare (product) 4 - 6 L/ha
        Rate per acre (product) 1.6 - 2.4 L/ha

Precautions (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

  • Use a minimum of 200 L/ha (80 L/ac) of spray solution to ensure thorough coverage.
          • Glyphosate
          Trade Name glyphosate *

          or glyphosate *

          or glyphosate *

          or glyphosate *

          or glyphosate *

          Active Ingredient glyphosate*
          or glyphosate*
          or glyphosate*
          or glyphosate*
          or glyphosate*
          Formulation 360 g/L
          450 g/L
          480 g/L
          500 g/L
          540 g/L
          Rate per hectare (active) 2.52 - 4.32 kg/ha
          2.52 - 4.32 kg/ha
          2.52 - 4.32 kg/ha
          2.52 - 4.32 kg/ha
          2.52 - 4.32 kg/ha
          Rate per hectare (product) 7 - 12 L/ha
          5.6 - 9.6 L/ha
          5.25 - 9 L/ha
          5 - 8.64 L/ha
          4.67 - 8 L/ha
          Rate per acre (product) 2.8 - 4.8 L/ac
          2.24 - 3.84 L/ac
          2.1 - 3.46 L/ac
          2 - 3.46 L/ac
          1.87 - 3.2 L/ac

Precautions (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

  • Apply to actively growing plants in 200-300 L/ha water (80-120 L/ac) to thoroughly wet the foliage but do not spray to the point of runoff.
            • Vanquish or Oracle + 2,4-D
            Trade Name
            + 2,4-D *
            Active Ingredient
            dicamba
            or dicamba
            + 2,4-D*
            Formulation
            480 g/L
            480 g/L
            470 g/L
            Rate per hectare (active)
            0.82 kg/ha
            0.82 kg/ha
            1.1 kg/ha
            Rate per hectare (product)
            1.7 L/ha
            1.7 L/ha
            2.2 L/ha
            Rate per acre (product)
            0.68 L/ac
            0.68 L/ac
            0.88 L/ac

Precautions (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

  • Apply in at least 560 L/ha water (224 L/ac).

          •  

*See Table 4-1. Herbicides Used in Ontario, page 23, for formulations available. See label for specific uses and rates.

Related Links


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: 16 June 2010