Sunflowers: Postemergence Grass Herbicides
Excerpt from 2010-2011 Publication 75, Guide to Weed Control, Order this publication
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Table
of Contents| Trade Name |
+ Assist
|
or Merge
|
|
|---|---|---|---|
| Active Ingredient |
sethoxydim
|
+ oil concentrate
|
or surfactant/solvent
|
| Formulation |
450 g/L
|
|
|
| Rate per hectare (active) |
0.15 - 0.2 kg/ha
|
2 kg/ha
|
1 kg/ha
|
| Rate per hectare (product) |
0.32 - 0.47 L/ha
|
2 L/ha
|
1 L/ha
|
| Rate per acre (product) |
0.13 - 0.19 L/ac
|
0.8 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).
- Treat the 1-6 leaf stage of annual grass.
- For annual grasses and volunteer cereals.
- Use the higher rate when volunteer cereals are present.
- Use MERGE for conditions or weeds requiring medium to high rates of POAST ULTRA.
- Flax is tolerant at any stage of growth.
- Apply using 110-200 L/ha of water (44-80 L/ac).
| Trade Name |
+ Merge
|
|
|---|---|---|
| Active Ingredient |
sethoxydim
|
+ surfactant/solvent
|
| Formulation |
450 g/L
|
|
| Rate per hectare (active) |
0.5 kg/ha
|
|
| Rate per hectare (product) |
1.1 L/ha
|
1 - 2 L/ha
|
| Rate per acre (product) |
0.45 L/ac
|
0.4 - 0.8 L/ac
|
Precautions (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).
- For quackgrass control. Thorough preplant tillage will ensure more uniform quackgrass emergence.
- Apply using 100-200 L/ha of water (40-80 L/ac).
Select + Amigo Trade Name + AmigoActive Ingredient clethodim+ surfactantFormulation 240 g/LRate per hectare (active) 0.03 - 0.09 kg/ha0.5% v/vRate per hectare (product) 0.13 - 0.38 L/ha5 - 10 L/1,000 LRate per acre (product) 0.05 - 0.15 L/ac5 - 10 L/1,000 L
Precautions (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).
- Apply when the annual grasses and volunteer cereals are in the 2-6 leaf stages.
- Apply to quackgrass in the 2-5 leaf stages. Use the higher rate for control of quackgrass.
- Allow 72 days between application and harvest.
| Trade Name | |
|---|---|
| Active Ingredient | fluazifop-p-butyl |
| Formulation | 125 g/L |
| Rate per hectare (active) | 0.075 kg/ha |
| Rate per hectare (product) | 0.6 L/ha |
| Rate per acre (product) | 0.24 L/ac |
Precautions (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).
- This rate is for control of volunteer corn only
- Apply at 2-5 leaf stage of the volunteer corn.
Precautions (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).
- Apply at 2-4 leaf stage of annual grasses and at 3-5 leaf stage quackgrass.
Related Links
- Weeds in Ontario
- Flax and sunflowers in Ontario
- Canola and mustard 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
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: | 17 June 2010 |