Herbicide Recommendations for Roadside Weed Control: Postemergence Broadleaf Herbicides

Excerpt from 2010-2011 Chapter 18, Publication 75, Guide to Weed Control, Order this publication

Table of Contents

1. 2,4-D
2. Diphenoprop BK 700, or Desormone, or Estaprop, or Dichlorprop D, or Turboprop 600
3. Garlon 4
4. Milestone
5. Milestone + 2,4-D Amine
6. Telar
7. Tordon 101
8. Transline
9. Vanquish or Oracle for leafy and cypress spurge
10. Vanquish or Oracle for goldenrod and field bindweed
11. Vanquish or Oracle for Canada thistle and perennial sow-thistle.
12. Related Links

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    2,4-D

    Trade Name	2,4-D *	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 (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

• Apply as amine or low-volatile ester in 200-300 L/ha water (80-120 L/ac) in early summer. See Table 18-2. Classification of Weeds According to Response to Various Foliage Sprays, page 335 for weed susceptibilities for 2,4-D mixtures.

Diphenoprop BK 700, or Desormone, or Estaprop, or Dichlorprop D, or Turboprop 600

Trade Name	Diphenoprop BK 700	or Desormone	or Estaprop	or Dichlorprop D	or Turboprop 600
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 the low-volatile ester in 200-500 L/ha water (80-200 L/ac) during early summer for most species.

  Garlon 4

  Trade Name	Garlon 4
  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/ac

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

• 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 - 120 g/ha
  Rate per hectare (product)	0.25 - 0.5 L/ha
  Rate per acre (product)	0.10 - 0.20 L/ac

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

• Apply Postemergence.
• 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.

Milestone + 2,4-D Amine

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

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

• Apply Postemergence.
• 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.

Telar

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

• Add a surfactant to improve control.

Tordon 101

Trade Name	Tordon 101
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 (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

• 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.

Transline

Trade Name	Transline
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 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.

   

Vanquish or Oracle for leafy and cypress spurge

Trade Name	Vanquish	or Oracle
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 more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

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

Vanquish or Oracle for Goldenrod and Field Bindweed

Trade Name	Vanquish	or Oracle
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 more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

• 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.

Vanquish or Oracle for Canada Thistle and Perennial Sow-Thistle.

Trade Name	Vanquish	or Oracle
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 (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

• For Canada thistle and perennial sow-thistle.
• Apply sprays 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

• Weeds in Ontario
• Problem Weed Control in Field Crops
• Integrated Pest Management (IPM)
• Pesticide Application and Safety
• Pesticide Companies and Agents
• OMAFRA Sprayer Calibration Calculator
• Search the PMRA website
• OMAFRA Publication 505: Ontario Weeds
• OMAFRA Publication 75: Guide To Weed Control