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Herbicide Recommendations for Perennial Weed Control: Postemergence Grass 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 Herbicides


Excerpt from 2008 Chapter 18, Publication 75, Guide to Weed Control, Order this publication

Table of Contents

  1. Amitrol
  2. Glyphosate
  3. Kerb
  4. 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)
  5. Other Perennial Weed Control Recommendations
  6. Related Links
Amitrol
Trade Name
Active Ingredient amitrole
Formulation 231 g/L
Rate per hectare (active) 3 to 4 kg/ha
Rate per hectare (product) 12.5 to 16.5 L/ha
Rate per acre (product) 5 to 6.6 L/ha

Precautions

  • Apply to actively growing quackgrass foliage when growth is 15-20 cm in height.
  • Wait at least 10 days before plowing or disking.

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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)
0.85 to 0.9 kg/ha
0.85 to 0.9 kg/ha
0.85 to 0.9 kg/ha
0.85 to 0.9 kg/ha
Rate per hectare (product)
2.35 to 2.5 L/ha
1.77 to 1.875 L/ha
1.7 to 1.8 L/ha
1.57 to 1.67 L/ha
Rate per acre (product)
0.94 to 1 L/ac
0.71 to 0.75 L/ac
0.68 to 0.72 L/ha
0.63 to 0.67 L/ha

Precautions

  • For a minimum of one season control of quackgrass, apply in the fall or spring before planting.
  • Apply, using flat-fan nozzles, in 50-100 L/ha water (20-40 L/ac).
  • For use in higher water volumes, the addition of a surfactant such as LI 700 is recommended.

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Kerb
Trade Name
Active Ingredient propyzamide
Formulation 50 WP
Rate per hectare (active) 1.1 to 1.8 kg/ha
Rate per hectare (product) 2.2 to 3.6 kg/ha
Rate per acre (product) 0.88 to 1.44 kg/ac

Precautions

  • Apply in fall from late September to early November but before soil freezes.
  • Control of weeds other than perennial grasses cannot be expected.

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Related Links

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