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Herbicide Recommendations for Poison-Ivy Control: Postemergence

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 Poison-Ivy Control: Postemergence


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
  3. Arsenal
  4. Diphenoprop, Estaprop or Dichlorprop
  5. Garlon 4
  6. Glyphosate
  7. Vanquish + 2,4-D
  8. 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)
  9. 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 the other materials used 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.

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
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

  • Apply in at least 1000 L/ha water (400 L/ac) when plants are actively growing. Thoroughly wet all foliage.

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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

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

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Diphenoprop or Estaprop or Dichlorprop 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/1000 L
6.8 kg/1000 L
6.8 kg/1000 L
6.8 kg/1000 L
Rate per hectare (product)
10 L/1000 L
11.7 L/1000 L
11.7 L/1000 L
8.25 to 16.5 L/ha

Precautions

  • Apply spray until foliage is thoroughly wet.

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Garlon 4
Trade Name
Active Ingredient triclopyr
Formulation 480 g/L
Rate per hectare (active) 1.92 to 2.88 kg/ha
Rate per hectare (product) 4 to 6 L/ha
Rate per acre (product) 1.6 to 2.4 L/ha

Precautions

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

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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
5 to 8.64
4.67to 8
Rate per acre (product) 2.8 to 4.8 L/ac
2.1 to 3.46 L/ac
2.1 to 3.46 L/ac
1.87 to 3.2 L/ac

Precautions

  • 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.

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Vanquish or Oracle + 2,4-D
Trade Name
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

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

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Related Links

 

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