Herbicide Recommendations for Perennial Weed Control: Postemergence Grass and Broadleaf Herbicides

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

Table of Contents

1. Arsenal
2. Casoron
3. Diurex for sandy soil
4. Diurex for clay and high organic matter soils.
5. Glyphosate
6. Hyvar X-L
7. Karmex
8. Krovar
9. Milestone
10. Milestone + 2,4-D Amine
11. Tordon 101
12. Related Links

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 or 40-220 L/ac) to wet all foliage during periods of active growth.

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  Casoron

  Trade Name	Casoron
  Active Ingredient	dichlobenil
  Formulation	4 Gr
  Rate per hectare (active)	11 - 22 kg/ha
  Rate per hectare (product)	275 - 550 kg/ha
  Rate per acre (product)	110 - 220 kg/ac

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

• To use as a split application, apply CASORON 4G at 150 kg/ha (60 kg/ac) in the fall and again at 150 kg/ha (60 kg/ac) in early spring.

   

  Diurex 80DWG

  Trade Name	Diurex 80WDG
  Active Ingredient	diuron
  Formulation	WP
  Rate per hectare (active)	8.8 - 22 kg/ha
  Rate per hectare (product)	11 - 27.5 kg/ha
  Rate per acre (product)	4.4 - 11 kg/ac

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

• Apply this rate on sands and sandy loam soils.

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Diurex 80DWG

Trade Name	Diurex 80WDG
Active Ingredient	diuron
Formulation	WP
Rate per hectare (active)	32 - 44 kg/ha
Rate per hectare (product)	40 - 55 kg/ha
Rate per acre (product)	16 - 22 kg/ac

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

• Apply this rate on clays or high organic soils.

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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/ha	2.1 - 3.6 L/ha	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 200-300 L/ha water (80-120 L/ac) when field bindweed has reached full flower, and Canada thistle and milkweed have reached the bud to bloom stage.

   

  Karmex

  Trade Name	Karmex
  Active Ingredient	diuron
  Formulation	80 DF
  Rate per hectare (active)	11.2 - 44 kg/ha
  Rate per hectare (product)	14 - 55 kg/ha
  Rate per acre (product)	5.6 - 22 kg/ac

  Hyvar X-L

  Trade Name	Hyvar X-L
  Active Ingredient	bromacil
  Formulation	240 g/L
  Rate per hectare (active)	7.2 - 10.8 kg/ha
  Rate per hectare (product)	30 - 45 L/ha
  Rate per acre (product)	12 - 18 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).

  Krovar

  Trade Name	Krovar
  Active Ingredient	bromacil/diuron
  Formulation	80 DF (1:1)
  Rate per hectare (active)	10.8 - 14.4 kg/ha
  Rate per hectare (product)	13.5 - 18 kg/ha
  Rate per acre (product)	5.4 - 7.2 kg/ac

  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 suppress: common tansy and dandelion.

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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 conrtol, 2,4-D amine many be added at a ratio of 1 part MILESTONE ai/ha to 12 parts 2,4-D amine ai/ha

Tordon 101

Trade Name	Tordon 101
Active Ingredient	picloram/2,4-D
Formulation	305 g/L (1:3.7)
Rate per hectare (active)	2.134 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 spring or early summer after growth appears.
• Use an approved drift control additive or system.
• A permit is required for purchase and use.

   

*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