Herbicide Recommendations for Woody Nursery Stock (Field Grown): Soil Applied Grass and Broadleaf Herbicides

Excerpt from 2010-2011 Chapter 16, Publication 75, Guide to Weed Control, Order this publication

Table of Contents

1. Casoron 4G
2. Dacthal W-75
3. Devrinol DF or Devrinol 10G
4. Devrinol DF + Simazine 80W
5. Princep Nine-T or Simadex
6. Treflan EC or Rival EC
7. Related Links

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

• PRE - Apply in late fall or early spring.
• Use lower rate for spring application.
• Do NOT apply until 4 weeks after transplanting second year stock.
• Reduce rate on lighter soil.

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

• Apply at lining out, late fall or early spring in 340 L of water
• Applications should be made to soil recently cultivated to a uniform texture.
• Rain or irrigation (1 cm) is needed to activate this herbicide.

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

• PPI - Apply any time of the year to a clean cultivated soil surface or before weeds germinate.
• Use only once prior to or during a growing season.
• DEVRINOL must reach the zone of weed germination, either by mechanical incorporation or by adequate irrigation or precipitation.
• Shallow incorporation to a chemical depth of 2.5-5.0 cm or an irrigation with sufficient water to wet the soil to depth of 5-10 cm should occur within 7 days of a spring or fall application and within 2 days of a summer application.
• Fall applications will control weeds the following spring and summer.
• Caution - Residues high enough to harm many crops may persist after repeated applications in perennial crops.

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

• PPI - Apply before weeds emerge on established plantings only.
• Will provide additional control of broadleaf weeds.
• See Precautions under DEVRINOL and SIMAZINE.

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

• PRE - Apply before weeds emerge on established plantings only.
• Do NOT replant nursery stock into treated soil after stock is removed.
• Do NOT use around ornamental shrubs if ground cover or bedding plants will be planted.
• Caution - Residues high enough to harm many crops may persist after repeated applications.

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

• PPI - Must be incorporated immediately after application, after a clean cultivation.
• This treatment does not control ragweed, annual nightshade or mustards.
• Lady's-thumb may also escape the treatment.

Related Links

• Weeds in Ontario
• Nursery and Landscape Plants in Ontario
• Problem Weed Control in Field Crops
• Integrated Pest Management (IPM)
• Pesticide Application and Safety
• Pesticide Companies and Agents
• OMAFRA Sprayer Calibration Calculator
• Search the PMRA website
• OMAFRA Publication 505: Ontario Weeds
• OMAFRA Publication 75: Guide To Weed Control