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


Pub 75: Guide to Weed Control > Nursery and Ornamental Crops > Herbicide Recommendations for Woody Nursery Stock (Field Grown): Postemergence Grass and Broadleaf Herbicides


Excerpt from 2010-11 Chapter 16, Publication 75, Guide to Weed Control, Order this publication

Cover of Publication 75, Guide to Weed ControlTable of Contents

  1. 2,4-D Amine + Glyfos
  2. Amitrol 240
  3. Glyphosate
  4. Related Links

 

 

2,4-D Amine + Glyfos
Trade Name
Active Ingredient
2,4-D*
+ glyphosate
Formulation
470 g/L
360 g/L
Rate per hectare (active)
0.470 kg/ha
0.360 kg/ha
Rate per hectare (product)
1 L/ha
1 L/ha
Rate per acre (product)
0.4 L/ac
0.4 L/ac

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

  • Ground directed spray only.
  • Apply ONLY to Balsam Fir and Fraser Fir.
  • Trees must be 1.2 metres high and spray should not touch the branches.
  • Appy once per year in June.
  • Appy mix in 100 L of water/ha.
Amitrol 240
Trade Name Amitrol 240
Active Ingredient amitrole
Formulation  
Rate per hectare (active) 0.39 - 0.69 kg/ha
Rate per hectare (product) 1.7 - 3.0 L/ha
Rate per acre (product) 0.68 - 1.2 L/ha

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

  • To be applied ONLY on spruce (Picea spp.)
  • Apply postemergence to actively growing plants, good coverage is essential.
  • If weeds are mature, it is advisable to cut them and then spray the re-growth.
  • Do NOT disturb treated plants for 2 weeks after application.
  • Do NOT make postharvest applications after October 1.
  • To control quackgrass and Canada Thistle, apply in the spring or fall to actively growing plants that are 15-20 cm tall. Wait 10-14 day and then plough or disk.
  • Avoid application to the crop during periods of rapid shoot elongation in the spring.
  • Applications can be made in the first year (0.68 L/ac) in either seedbed or transplants, but only after the seedlings have set bud.
  • The rate may be increased to 1.2 L/ac for actively growing seedlings or transplant bareroot spruce beyond the first year.
Glyphosate *
Trade Name

or glyphosate *

or glyphosate *

or glyphosate *

Active Ingredient
glyphosate*
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)
0.27 - 4.32 kg/ha
0.27 - 4.32 kg/ha
0.27 - 4.32 kg/ha
0.27 - 4.32 kg/ha
0.27 - 4.32 kg/ha
Rate per hectare (product)
0.75 - 12 L/ha
0.6 - 9.6L/ha
0.56 - 9 L/ha
0.54 - 8.64 L/ha
0.5 - 8 L/ha
Rate per acre (product)
0.3 - 4.8 L/ac
0.24 - 3.84 L/ac
0.22 - 3.6 L/ac
0.22 - 3.5 L/ac
0.2 - 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 actively growing weeds in the fall, or spring prior to emergence of any crop.
  • Allow 5-7 days translocation time after application before doing any tillage when conditions are good. If cool temperatures follow application, allow additional time for translocation to be completed before disturbing treated weeds.
  • Only weeds emerged at application time will be controlled. Additional weed control programs will be necessary to control weeds germinating later.
  • Repeat application to regrowth may be necessary for complete control.
  • For specific information on product rates and notes for annual and perennial weed control refer to Table 6-3 . Postharvest Weed Control Ratings, page 83.

    *See Table 4-1. Herbicides Used in Ontario, page 23, for formulations available. See label for specific uses and rates.


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: 7 April 2011