Preplant and Postharvest Weed
Control: Postharvest (Grass and Broadleaf Herbicides)
| Author: |
OMAFRA Staff
|
| Creation Date: |
25 November
2002
|
| Last Reviewed: |
20 June 2008
|
 Excerpt
from 2008 Chapter 6, Publication 75, Guide to Weed Control, Order
this publication
Table of Contents
- Introduction
- Amitrol 240
- Banvel II or Oracle + Glyphosate + non-ionic surfactant
- Glyphosate
- Preplant and Postharvest Weed Control Tables
- Non-Selective Herbicides Available for Preplant Site Preparation
(Table 6-1) (PDF
- 41kb)
- Preplant Herbicide Weed Control Ratings (Table
6-2) (PDF -
39 kb)
- Postharvest Weed Control (Table
6-3) (PDF -
38 kb)
- Other Special Methods of Weed Control
- Related Links
Introduction
Leaf stage of the weeds is critical for good weed control. Smaller weeds
are generally easier to kill but there needs to be enough leaf surface
to intercept the herbicide. Apply according to recommended leaf stages.
Crop stage is important to optimize crop safety. Adjuvants will frequently
improve the weed control when used as directed. Weather or other conditions
may influence the optimum rate of adjuvant, see the product label for
more details. Always use appropriate drift management technology.
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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
- Apply after harvest when regrowth is 10 to 15 cm tall for Canada
thistle and sow-thistle.
- Do NOT cultivate for 2 weeks after application.
- Do NOT apply after a heavy frost, generally after
Oct. 1.
- Do NOT plant to a crop for 8 months after treatment.
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Banvel II or Oracle + Glyphosate
+ non-ionic surfactant
| Trade Name |
|
|
|
|
|
+ non-ionic surfactant
|
| Active Ingredient |
dicamba
|
+ glyphosate
|
or glyphosate
|
or glyphosate
|
or glyphosate
|
+ non-ionic surfactant
|
| Formulation |
480 g/L
|
360 g/L
|
480 g/L
|
500 g/L
|
540 g/L
|
|
| Rate per hectare (active) |
0.6 kg/ha
|
0.6 kg/ha
|
0.6 kg/ha
|
0.6 kg/ha
|
0.6 kg/ha
|
0.35 L/ha
|
| Rate per hectare (product) |
1.25 L/ha
|
1.7 L/ha
|
1.25 L/ha
|
1.2 L/ha
|
1.11 L/ha
|
0.35 L/ha
|
| Rate per acre (product) |
0.5 L/ac
|
0.68 L/ac
|
0.5 L/ac
|
0.48 L/ac
|
0.44 L/ac
|
0.14 L/ac
|
Precautions
- Apply in the fall to actively growing vegetation at least 2 weeks
prior to a killing frost.
- Do NOT apply before fall seeded crops.
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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 hectare (active) |
0.27 to 4.32 kg/ha
|
0.27 to 4.32 kg/ha
|
0.27 to 4.32 kg/ha
|
0.27 to 4.32 kg/ha
|
| Rate per hectare (product) |
0.75 to 12 L/ha
|
0.56 to 9 L/ha
|
0.54 to 8.64 L/ha
|
0.5 to 8 L/ha
|
| Rate per acre (product) |
0.3 to 4.8 L/ac
|
0.22 to 3.6 L/ac
|
0.22 to 3.5 L.ac
|
0.2 to 0.93 L/ac
|
Precautions
- For actively growing weeds in the fall, or spring prior to emergence
of any crop.
- Allow 5 to 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 rate and notes for annual and
perennial weed control refer to Table
4-2.
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Related Links
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For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca
|
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