Herbicide Recommendations for Weed Control in Ditches: Emergents


Pub 75: Guide to Weed Control > Roadsides and Non-Crop Areas > Herbicide Recommendations for Weed Control in Ditches: Emergents


Excerpt from 2010-2011 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. Related Links

 

Weed Control in Ditches

When ditches on roadsides, or in other locations, contain standing or moving water, do not apply herbicides to emergent weeds without consulting the Ontario Ministry of the Environment regarding the need for a permit (see Water Weeds, page 339). However, such permits are not normally necessary to apply herbicides to control weeds adjacent to ditches or weeds in ditches when no water is present.


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

2,4-D
Trade Name

or 2,4-D *
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 more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

  • For bulrushes.
  • Apply as the low-volatile ester in 750-1,000 L/ha (300-400 L/ac) water.
    Amitrol 240
    Trade Name
    Active Ingredient amitrole
    Formulation 231 g/L
    Rate per hectare (active) 9 - 11 kg/ha
    Rate per hectare (product) 37.5 - 45.75 L/ha
    Rate per acre (product) 15 - 18.3 L/ac

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

  • For cattails.
  • Apply in a minimum of 1,000 L/ha (400 L/ac) water from the time cattails are formed until frost.
    Glyphosate
    Trade Name

    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/ac
    2.1 - 3.6 L/ac
    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).

  • 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.

Related Links


For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca
Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 16 June 2010