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

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 Perennial Weed Control: Postemergence Grass and Broadleaf Herbicides


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. 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. 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)
  13. Other Perennial Weed Control Recommendations
  14. Related Links
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 or 40-220 L/ac) to wet all foliage during periods of active growth.

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

Precautions

  • 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.

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

Precautions

  • 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 to 44 kg/ha
Rate per hectare (product) 40 to 55 kg/ha
Rate per acre (product) 16 to 22 kg/ac

Precautions

  • Apply this rate on clays or high organic soils.

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Glyphosate
Trade Name
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 L/ha
5 to 8.64 L/ha
4.67 to 8 L/ha
Rate per acre (product)
2.8 to 4.8 L/ac
2.1 to 3.6 L/ha
2 to 3.46 L/ac
1.87 to 3.2 L/ac

Precautions

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

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

Precautions

  • Apply in 1000 L/ha water (400 L/ac).

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

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Milestone
Trade Name Milestone
Active Ingredient aminopyralid
Formulation 240 g/L
Rate per hectare (active) 60 to 120 g/ha
Rate per hectare (product) 0.25 to 0.5 L/ha
Rate per acre (product) 0.10 to 0.20 L/ac

Precautions

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

Precautions

  • Apply POST.
  • 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

* see Table 4-1 for formulations available

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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:
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E-mail: ag.info.omafra@ontario.ca