Herbicide Recommendations for Perennial Weed Control: Postemergence Broadleaf Herbicides


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


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. 2,4-D
  2. Amitrol 240
  3. Diphenoprop BK 700, or Desormone, or Estaprop or or Dichlorprop D, or Turboprop 600
  4. Garlon 4
  5. Telar
  6. Tordon 101
  7. Transline
  8. Vanquish or Oracle
  9. Related Links
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 - 2 kg/ha
1 - 2 kg/ha
1 - 2 kg/ha
Rate per hectare (product)
2 - 4.25 L/ha
1.77 - 3.55 L/ha
1.5 - 3 L/ha
Rate per acre (product)
0.85 - 1.7 L/ac
0.71 - 1.42 L/ha
0.6 - 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 1,000 L/ha water (400 L/ac).
  • See Table 18-2. Classification of Weeds According to Response to Various Foliage Sprays, page 335 for list of weed susceptibilities to 2,4-D and related chemicals.
    Amitrol 240
    Trade Name
    Active Ingredient amitrole
    Formulation 231 g/L
    Rate per hectare (active) 4.5 - 6.75 kg/ha
    Rate per hectare (product) 18.75 - 28 L/ha
    Rate per acre (product) 7.5 - 11.2 L/ac

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

  • For milkweed control.
  • Apply in 500-1,000 L/ha water (200-400 L/ac) after most shoots have emerged but before flowering.
    Diphenoprop BK 700 or Desormone or Estaprop or Dichlorprop D or Turboprop 600
    Trade Name

    or Desormone

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

  • Apply as a low-volatile ester in 200-600 L/ha water (80-240 L/ac) during the month of May or in early fall.
      • Garlon 4
      Trade Name
      Active Ingredient triclopyr
      Formulation 480 g/L
      Rate per hectare (active) 0.48 - 1.92 kg/ha
      Rate per hectare (product) 1 - 4 L/ha
      Rate per acre (product) 0.4 - 1.6 L/ha

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

  • Apply in a minimum of 200 L/ha water (80 L/ac) to ensure uniform coverage.

     

      Telar
      Trade Name
      Active Ingredient chlorsulfuron
      Formulation 75 DF
      Rate per hectare (active) 90 g/ha
      Rate per hectare (product) 120 g/ha
      Rate per acre (product) 48 g/ac

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

  • For Canada thistle, dandelion, and field horsetail. Add a surfactant to improve control.

      •  

Tordon 101
Trade Name
Active Ingredient picloram/2,4-D
Formulation 305 g/L (1:3,7)
Rate per hectare (active) 2.135 kg/ha
Rate per hectare (product) 7 L/ha
Rate per acre (product) 2.8 L/ac

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

  • For Canada thistle, sweet and red clover, wild carrot, common ragweed, goldenrod, dock, plantain, prickly lettuce, burdock, fleabane and vetch.
  • Apply in 200 L/ha of water as a constant volume foliar application.
  • Apply when weeds are actively growing.
  • Do not allow drift on susceptible vegetation such as beans, peas, vegetable crops, gardens or shelterbelts.
  • A permit is required for purchase and use.
    Transline
    Trade Name
    Active Ingredient clopyralid
    Formulation 360 g/L
    Rate per hectare (active) 0.15 - 0.3 kg/ha
    Rate per hectare (product) 0.42 - 0.83 L/ha
    Rate per acre (product) 0.17 - 0.33 L/ac

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

  • For coltsfoot, spotted knapweed, ragweed, Canada thistle, ox-eye daisy, tufted vetch, scentless chamomile and clover.
  • Treat when weeds are young and actively growing.
  • For coltsfoot, treatments should be performed prior to August.
  • Apply as a broadcast in 200 L/ha water (80 L/ac) or in sufficient water to ensure thorough coverage of target vegetation.
    • Vanquish or Oracle
    Trade Name
    Active Ingredient
    dicamba
    or dicamba
    Formulation
    480 g/L
    480 g/L
    Rate per hectare (active)
    1.108 kg/ha
    1.108 kg/ha
    Rate per hectare (product)
    2.3 L/ha
    2.3 L/ha
    Rate per acre (product)
    0.92 L/ac
    0.92 L/ac

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

  • For field bindweed, leafy spurge and cypress spurge.
  • Apply sprays in mid June or during flowering, in 100-200 L/ha water (40-80 L/ac). Canada thistle or perennial sow-thistle.
  • Apply spray in late spring just prior to flowering, or apply to regrowth escaping other treatments, in summer or fall.

*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:
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E-mail: ag.info.omafra@ontario.ca
Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 16 June 2010