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Preplant and Postharvest Weed Control: Spot Treatment with Hand-Held Equipment for Selective Weed Control

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 20 June 2008

Pub 75: Guide to Weed Control > Preplant and Postharvest Weed Control > Spot Treatment with Hand-Held Equipment for Selective Weed Control

Excerpt from 2008 Chapter 6, Publication 75, Guide to Weed Control, Order this publication

Cover of Publication 75, Guide to Weed ControlTable of Contents

  1. Amitrol 240
  2. Glyphosate
  3. Preplant and Postharvest Weed Control Tables
    • Non-Selective Herbicides Available for Preplant Site Preparation (Table 6-1) (PDF - 41 kb)
    • Preplant Herbicide Weed Control Ratings (Table 6-2) (PDF - 39 kb)
    • Postharvest Weed Control (Table 6-3) (PDF - 38 kb)
  4. Other Special Methods of Weed Control
  5. Related Links
Amitrol 240
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/ac

Precautions

  • Use ONLY for non-crop land and pasture.
  • Thoroughly wet all leaves and stems of weeds. Repeat applications when new growth appears.
  • Apply to Canada thistle and sow-thistle at early bud to bloom, quackgrass and horsetail at 10-15 cm, dandelion when young, toadflax and hoary cress at advanced rosette, milkweed in early summer, poison ivy when fully leafed.
  • Do NOT allow livestock to eat treated vegetation. Keep livestock off treated area until weeds are dead and new growth has emerged.

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Glyphosate
Trade Name

or glyphosate

Active Ingredient
glyphosate
or glyphosate
or glyphosate
or glyphosate
Formulation
360 g/L
480 g/L
500 g/L
540 g/L
Rate per volume (active)
0.36 to 0.72 kg/100 L
0.36 to 0.72 kg/100 L
0.36 to 0.72 kg/100 L
0.36 to 0.72 kg/100 L
Rate per volume (product)
1 L to 2 L/100 L
0.75 L/2 L water
0.72 L/2 L water
0.67 L/2 L water

Precautions

  • For actively growing weeds. Direct spray to avoid desirable vegetation.
  • Allow 5-7 days translocation time after application before doing any mowing or tillage when conditions are good. If cool temperatures follow application, allow additional time for translocation to be completed before disturbing treated weeds.
  • Canada thistle and sow-thistle should be at least in early bud, milkweed at bud, bindweed at full flower, and dogbane past full bloom, and quackgrass with 3-4 new leaves for best results.

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Related Links

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