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Preplant and Postharvest Weed Control: Seedbeds and Potting Soil - Soil Applied Fumigants

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

Pub 75: Guide to Weed Control > Preplant and Postharvest Weed Control > Seedbeds and Potting Soil: Soil Applied Fumigants

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. Introduction
  2. Basamid
  3. Terr-O-Gas 67
  4. Vapam
  5. 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)
  6. Other Special Methods of Weed Control
  7. Related Links

 

Introduction

To convert kg/ha or L/ha to g/ha or mL/100 m²: Multiply by 10 and change units to 100 m².
Example: 11 kg/ha becomes 110 g/100 m²; 28.4 L/ha becomes 284 mL/100 m²

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Basamid
Trade Name
Active Ingredient dazomet
Formulation 98 Gr
Rate per hectare (active) 500 kg/ha
Rate per hectare (product) 510 kg/ha
Rate per acre (product) 204 kg/ac

Precautions

  • Do NOT use below 6°C.
  • Refer to manufacturer's directions for specific details as well as directions on sealing soil, evacuating gases and performing the safety germination test.

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Terr-O-Gas 67
Trade Name
Active Ingredient methyl bromide/chloropicrin
Formulation 67 Li
Rate per hectare (active) see label
Rate per hectare (product) see label
Rate per acre (product) see label

Precautions

  • A poisonous gas which must be applied under a gas proof cover (usually plastic).
  • Its use is subject to the Pesticides Act.
  • It may be used by the grower on his own seedbeds but he must obtain a permit from the Ontario Ministry of the Environment each time it is used.
  • The manufacturer's instructions must be followed, and the seedbed or greenhouse aired thoroughly after the treatment period.
  • If there is any question, the safety precautions in the Pesticides Act should be studied, or inquiry made at the resource centres of the Ontario Ministry of Agriculture and Food or the Ontario Ministry of the Environment.

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Vapam
Trade Name
Active Ingredient metam sodium
Formulation 380 g/L
Rate per 100 m2 (active) 3.8 kg/100 m2
Rate per 100 m2 (product) 10 L/100 m2 in 800 L water

Precautions

  • Apply as a drench to a soil that should be wet to a depth of at least 8 cm.
  • Do NOT plant for 10-14 days or longer if the weather is cool.

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Related Links

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