Herbicide Recommendations for Turfgrass: Postemergence Broadleaf Herbicides

Table of Contents

1. Introduction
2. 2,4-D
3. 2,4-D/dicamba/mecoprop-P
4. 2,4-D + Mecoprop
5. Basagran + Assist
6. Compitox or Mecoprop
7. IPCO Premium 2-way XP Turf Herbicide
8. MCPA Amine
9. Mecoturf + 2,4-D
10. Sarritor
11. Vanquish
    
12. Related Links

Introduction

Apply in 200-400 L/ha (80-160 L/ac) water. Avoid contact with ornamentals and flowers. Avoid applying during hot, dry weather. DO NOT irrigate, rake, and/or mow until at least 24 hours after application. DO NOT apply to newly seeded turf until after second mowing.

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

• To control many broadleaf weeds including dandelions, lamb's-quarters, mustards, peppergrass, pigweeds, plantains, shepherd's-purse, smartweeds, and vetch.
• Damage may occur when applied to bentgrass.
• If used on bentgrass apply at 0.28 kg a.i./ha. Some yellowing of bentgrass may occur.

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

• To control 2,4-D and MCPA tolerant weeds such as chickweeds, clovers, ground ivy and black medick as well as many broadleaf weeds including dandelions, lamb's-quarters, mustards, peppergrass, pigweeds, plantains, shepherd's-purse, smartweeds, and vetch.
• In closely mowed bentgrass (greens) apply at half doses (30 mL/100 m²).
• Temporary yellowing of bentgrass may occur.
• Recovery from injury will occur 1 week after application
• See Precautions for VANQUISH, page 316.

   

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2,4-D + Mecoprop

Trade Name	2,4-D *	or 2,4-D *	or 2,4-D *	+ Mecoprop *
Active Ingredient	2,4-D*	or 2,4-D*	or 2,4-D*	+ mecoprop-P*
Formulation	470 g/L	564 g/L	660 g/L	150 g/L
Rate per hectare (active)	0.85 - 1.1 kg/ha	0.85 - 1.1 kg/ha	0.85 - 1.1 kg/ha	0.85 - 1.1 kg/ha
Rate per hectare (product)	1.81 - 2.34 L/ha	1.51 - 1.95 L/ha	1.29 - 1.67 L/ha	5.67 - 7.34 L/ha
Rate per acre (product)	0.72 - 0.93 L/ac	0.6 - 0.78 L/ac	0.52 - 0.67 L/ac	2.27 - 2.93 L/ac

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

• May be combined with VANQUISH(0.21 L/ha (0.08 L/ac)) for control of young knotweed.
• Damage may occur when applied to bentgrass.
• For newly established turf at least 4 weeks old, use 2,4-D at half the usual concentration (0.4-0.6 kg in 800 L water/ha) or mecoprop- P (0.4-0.6 kg in 400 L water/ha) for annual weeds.

 

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Basagran + Assist

Trade Name	Basagran	+ Assist
Active Ingredient	bentazon	+ oil concentrate
Formulation	480 g/L
Rate per hectare (active)	0.84 kg/ha
Rate per hectare (product)	1.75 L/ha	2 L/ha
Rate per acre (product)	0.7 L/ac	0.8 L/ac

 

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

• To control top growth of yellow nutsedge. Apply when nutsedge is young and actively growing. Make 2 applications 10 days apart.
• Do NOT mow grass 3-5 days before and after application.
• Do NOT treat newly seeded turf until well established.

 

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Compitox or Mecoprop

Trade Name	Compitox	or Mecoprop
Active Ingredient	mecoprop-P	or mecoprop-P
Formulation	150 g/L	150 g/L
Rate per hectare (active)	0.83 - 1.28 kg/ha	0.83 - 1.28 kg/ha
Rate per hectare (product)	5.5 - 8.5 L/ha	5.5 - 8.5 L/ha
Rate per acre (product)	2.2 - 3.4 L/ac	2.2 - 3.4 L/ac

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

• To control 2,4-D and MCPA tolerant weeds such as chickweeds, clovers, ground ivy and black medick, as well as many broadleaf weeds.
• May be applied to bentgrass.
• Apply to dandelion prior to flowering.
• Repeated applications may be needed for dandelion and black medick.

 

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IPCO Premium 2-Way XP Turf Herbicide

Trade Name	IPCO Premium 2-Way XP Turf Herbicide
Active Ingredient	mecoprop-P/2,4-D
Formulation	(1:1) 400 g/L
Rate per hectare (active)	2 kg/ha
Rate per hectare (product)	5 L/ha
Rate per acre (product)	2 Lha

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

• May be combined with VANQUISH (0.21 L/ha (0.08 L/ac)) for control of young knotweed.
• Damage may occur when applied to bentgrass.
• For newly established turf at least 4 weeks old, use 2,4-D at half the usual concentration (0.4-0.6 kg in 800 L water/ha) or mecoprop (0.4-0.6 kg in 400 L water/ha) for annual weeds.

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MCPA Amine*

Trade Name	MCPA Amine
Active Ingredient	MCPA*
Formulation	500 g/L*
Rate per hectare (active)	1.1 - 1.4 kg/ha
Rate per hectare (product)	2.2 - 2.8 L/ha
Rate per acre (product)	0.88 - 1.12 L/ac

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

• For control of field horsetail, dandelion, lamb's-quarters, mustards, plantains, shepherd's-purse, and wild carrot.
• Do NOT apply to bentgrass unless necessary, and then only at 0.28 kg/ha. Some yellowing of bentgrass may occur.
• Use as a substitute for 2,4-D. At slightly higher doses than 2,4-D it usually provides comparable weed control to 2,4-D.
• Reduced control of dandelion and plantain may occur during dry, hot weather.

 

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Mecoturf + 2,4-D

Trade Name	Mecoturf + 2,4-D
Active Ingredient	mecoprop-P/2,4-D
Formulation	(1:1) 400 g/L
Rate per hectare (active)	1.7 - 2.2 kg/ha
Rate per hectare (product)	4.25 - 5.5 L/ha
Rate per acre (product)	1.7 - 2.2 L/ac

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

• May be combined with VANQUISH (0.21 L/ha (0.08 L/ac)) for control of young knotweed.
• Damage may occur when applied to bentgrass.
• For newly established turf at least 4 weeks old, use 2,4-D at half the usual concentration (0.4-0.6 kg in 800 L water/ha) or mecoprop-P (0.4-0.6 kg in 400 L water/ha) for annual weeds.

 

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Sarritor

Trade Name	Sarritor
Active Ingredient	Sclerotinia minor (strain IMI 344141)
Formulation
Rate per hectare (product)	40 to 60 g/m2

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

• For suppression of dandelion and other broadleaf weeds.
• Apply when daytime high temperatures are 18-24ºC and rainfall occurs within 12 hours of application.
• Use higher rate when environmental conditions are sub-optimal or when dandelion pressure is high.
• Do NOT mow for 3 days after application.
• Do NOT allow SARRITOR to come in contact with non-target, desirable plant species as severe damage may occur.
  

 

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Vanquish

Trade Name	Vanquish
Active Ingredient	dicamba
Formulation	480 g/L
Rate per hectare (active)	0.6 kg/ha
Rate per hectare (product)	1.25 L/ha
Rate per acre (product)	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).

• Do NOT apply to bentgrass.
• Do NOT apply near shallow rooted perennials to avoid root uptake and injury.
• To control broadleaf weeds including 2,4-D tolerant weeds such as chickweeds, clover and young knotweed, but will not adequately control plantain.
• Prepared mixtures of VANQUISH and 2,4-D are effective on a wide range of turf weed species, including knotweed, which is not controlled by most other herbicides except when very young.
• Do NOT use mixtures containing VANQUISH close to shrubs, or other susceptible ornamentals, at rates above 0.425 kg/ha (active).
• Do NOT mow grass 3-5 days before and after application.
• Do NOT treat newly seeded turf until well established.

 

*See Table 4-1. Herbicides Used in Ontario, page 23, for formulations available. Not all formulations are registered on turf. See label for specific uses and rates.

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Related Links

• Weeds in Ontario
• Turfgrass in Ontario
• 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