In This Section

Topics

Herbicide Recommendations for Weed Control in Ditches: Emergents

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 Weed Control in Ditches: Emergents


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. Weed Control in Ditches
  2. 2,4-D
  3. Amitrol 240
  4. Glyphosate
  5. Gramoxone
  6. 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)
  7. Related Links

 

Weed Control in Ditches

When ditches on roadsides, or in other locations, contain standing or moving water, herbicides should not be applied to emergent weeds without consulting the Ontario Ministry of the Environment regarding the need for a permit (see Water Weeds section). However, such permits are not normally necessaryto apply herbicides to control weeds adjacent to ditches or weeds in ditches when no water is present.

The following precautions should be taken:

  1. Spray when ditch or stream contains no flowing water.
  2. Avoid spraying directly onto water surface (violates Pesticides Act, Water Resources Act).
  3. Schedule spray programs so that extensive sections of stream bank or ditch bank are not sprayed at one time.
  4. Work upstream rather than downstream along the stream bank or ditch bank.
  5. Ascertain downstream water uses to avoid possible conflict with the rights of other landowners.

| Top of Page |

2,4-D
Trade Name

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)
2.25 kg/ha
2.25 kg/ha
2.25 kg/ha
Rate per hectare (product)
4.5 L/ha
4 L/ac
3.4 L/ac
Rate per acre (product)
1.8 L/ac
1.6 L/ac
1.36 L/ac

Precautions

  • For bulrushes.
  • Apply as the low-volatile ester in 750-1000 L/ha (300-400 L/ac) water.

| Top of Page |

Amitrol 240
Trade Name
Active Ingredient amitrole
Formulation 231 g/L
Rate per hectare (active) 9 to 11 kg/ha
Rate per hectare (product) 37.5 to 45.75 L/ha
Rate per acre (product) 15 to 18.3 L/ac

Precautions

  • For cattails.
  • Apply in a minimum of 1000 L/ha (400 L/ac) water from the time cattails are formed until frost.

| Top of Page |

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/ac
2 to 3.46 L/ac
1.87 to 3.2 L/ac

Precautions

  • For cattails.
  • Apply during mid to late flowering stage (mid July to late August) when cattails are actively growing.
  • For isolated spots use a 1% solution (1 L product in 100 L water) and spray to wet all foliage but not to the point of runoff.

| Top of Page |

Related Links

 

| Top of Page |

For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca