Herbicide Recommendations for Cereal Crops: Postemergence Broadleaf Herbicides
Excerpt from 2010-11 Publication 75, Guide to Weed Control, Order this publication
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Table
of Contents| Trade Name | 2,4-D* |
or 2,4-D* |
or 2,4-D* |
|---|---|---|---|
| Active Ingredient |
2,4-D
|
or 2,4-D
|
or 2,4-D
|
| Formulation |
470 g/L
|
564 g/L
|
660 g/L
|
| Rate per hectare (active) |
0.35 to 0.85 kg/ha
|
0.35 to 0.85 kg/ha
|
0.35 to 0.85 kg/ha
|
| Rate per hectare (product) |
0.75 to 1.8 L/ha
|
0.62 to 1.4 L/ha
|
0.53 to 1.29 L/ha
|
| Rate per acre (product) |
0.3 to 0.7 L/ac
|
0.25 to 0.56 L/ha
|
0.21 to 0.52 L/ac
|
Precautions
- Do NOT use on oats, winter barley and cereals underseeded with legumes.
- Apply when spring cereals are in the 3-5 leaf stage of growth.
For winter cereals:
- Do NOT apply to seedling winter cereals in the fall.
- For control of winter annuals apply early before flower buds appear on the weeds.
* Numerous products exist, refer to Table 4-1 Herbicides Used in Ontario for a complete list of available products.
Precautions
- Do NOT use on winter barley, fall rye and cereals underseeded with legumes.
- Control is best when weeds are in the 2-3 leaf stage or rosettes less than 5 cm diameter. Use the higher rates on older weeds.
- Do NOT apply when night time air temperatures are below 10°C prior to and after application.
- Apply to spring wheat and barley when they are in the 2-5 leaf stage.
- Apply to winter wheat in the spring when the crop is 15-25 cm tall before the shot blade stage.
- Underseeded seedling grasses should be at the 2-4 leaf stage.
| Trade Name | Buctril M | or Badge, Logic M, Mextrol |
|---|---|---|
| Active Ingredient |
bromoxynil/MCPA
|
or bromoxynil/MCPA
|
| Formulation |
(1:1) 560 g/L
|
(1:1) 450 g/L
|
| Rate per hectare (active) |
0.56 kg/ha
|
0.56 kg/ha
|
| Rate per hectare (product) |
1 L/ha
|
1.25 L/ha
|
| Rate per acre (product) |
0.4 L/ac
|
0.5 L/ac
|
Precautions
- Apply when weeds are in the 2-6 leaf stage and cereals are in the 2 to early flag leaf stage. For control of winter annual weeds, apply before flower buds appear.
- Best results are obtained with applications at the 2-5 leaf cereal stage since thorough spray coverage of weed foliage is required for optimum weed control.
Underseeded Red Clover (Winter Wheat Only):
- Do NOT use on Fall Rye or Spring Cereals underseeded with red clover.
- Apply in the spring when the red clover is in the 1st-3rd trifoliate stage and when the winter wheat provides a protective canopy over the clover.
- Do NOT apply in less than 200 L/ha water (80 L/ac)
- Do NOT apply if clover is under stress and avoid overlaps as injury may result.
| Trade Name | |
|---|---|
| Active Ingredient | dicamba/MCPA |
| Formulation | (1:4) 420 g/L |
| Rate per hectare (active) | 0.525 kg/ha |
| Rate per hectare (product) | 1.25 L/ha |
| Rate per acre (product) | 0.5 L/ac |
Precautions
- Do NOT use on fall rye, winter barley and cereals underseeded with legumes.
- Apply when spring cereals are in the 2-5 leaf stage.
- Hempnettle, corn spurry and cow cockle are controlled best when small.
- Apply to winter wheat in the spring when weeds have emerged and the crop is 15-25 cm tall before the flag leaf stage.
- Do NOT apply when night time air temperatures are below 10°C prior to and after application.
Precautions
- Apply 2,4-DB at the 5-leaf to early flag stage of cereals.
- Oats may be damaged if treated before the 5-leaf stage.
- Apply when the legumes are in the 1-4 trifoliate stage.
- Use only if cereals are underseeded to alfalfa, bird's foot trefoil, alsike or ladino clover and grasses. Red clover will be damaged by 2,4 DB.
- Apply in 150-200 L/ha (60-80 L/ac) water.
- Wild mustard plants are not controlled if sprayed when they are beyond the 4 leaf stage.
| Trade Name | Estaprop |
or Turboprop |
|
|---|---|---|---|
| Active Ingredient |
dichlorprop/2,4-D
|
or dichlorprop/2,4-D
|
or dichlorprop/2,4-D
|
| Formulation |
582 g/L
|
582 g/L
|
582 g/L
|
| Rate per hectare (active) |
1.017 kg/ha
|
1.017 kg/ha
|
1.017 kg/ha
|
| Rate per hectare (product) |
1.75 L/ha
|
1.75 L/ha
|
1.75 L/ha
|
| Rate per acre (product) |
0.7 L/ac
|
0.7 L/ac
|
0.7 L/ac
|
Precautions
- Do NOT use on oats, winter barley, fall rye and cereals underseeded with legumes.
- Apply to emerged weeds at the 4 leaf to early flag leaf stage of spring cereals.
For winter wheat:
- Apply in early spring to emerged weeds.
- May be used up to the early flag leaf stage.
| Trade Name | |
|---|---|
| Active Ingredient |
pyrasulfotole/bromoxynil
|
| Rate per hectare (active) |
213 kg/ha
|
| Rate per hectare (product) |
0.83 L/ha
|
| Rate per acre (product) |
0.33 L/ha
|
Precautions
-
Do NOT use on oats, winter barley, fall rye or cereals underseeded with legumes.
- Apply postemergence and prior to flag leaf emergence.
- The addition of ammonium sulphate at 1 L/ha (0.4 L/ac) is required for the control of cleavers at the 4-6 whorl growth stage.
- Do NOT graze the treated crops or cut for forage or hay within 25 days of application.
- Do NOT harvest wheat or barley for grain or straw
within 45 days of application.
Precautions
- Do NOT use on oats, winter cereals or cereals underseeded with forage crops.
- Apply when wheat or barley are at the 3 leaf to flag leaf emergence stages.
- For the control of Canada thistle and perennial sow-thistle (top growth only).
| Trade Name | MCPA* |
or MCPA*
|
|---|---|---|
| Active Ingredient |
MCPA
|
MCPA
|
| Formulation |
500 g/L
|
600 g/L
|
| Rate per hectare (active) |
0.35 to 0.85 kg/ha
|
0.35 to 0.85 kg/ha
|
| Rate per hectare (product) |
0.7 to 1.7 L/ha
|
0.58 - 1.4 L/ha
|
| Rate per acre (product) |
0.28 to 0.68 L/ac
|
0.23-0.56 L/ac
|
Precautions
- Do NOT use on cereals underseeded with forage crops.
- Apply when the crop is in the 2-5 leaf stage of growth.
- For hempnettle control, use the high rate of MCPA.
* Numerous products exist, refer to Table 4-1 Herbicides Used in Ontario for a complete list of available products.
Precautions
- For use on cereals underseeded to red clover.
- Treat at an early stage of clover development when it is covered by a canopy of crop.
- Apply in the spring when crop growth commences until early flag leaf stage.
- Apply in 180-240 L/ha water (72-96 L/ac).
- The lower rate may not kill ragweed.
* Numerous products exist, refer to Table 4-1 Herbicides Used in Ontario
for a complete list of available products.
Precautions
-
Do NOT use on fall rye and cereals underseeded with forage crops.
-
Use from the 3 leaf stage to early flag leaf when cereals are 10-15 cm tall.
-
Apply when weeds are in the 2-4 leaf stage.
-
Use the higher rate for more mature weeds.
| Trade Name | Pardner | Brotex |
or Koril |
|---|---|---|---|
| Active Ingredient |
bromoxynil
|
or bromoxynil
|
or bromoxynil
|
| Formulation |
280 g/L
|
240 g/L
|
235 g/L
|
| Rate per hectare (active) |
0.28 to 0.366 kg/ha
|
0.28 to 0.366 kg/ha
|
0.28 to 0.366 kg/ha
|
| Rate per hectare (product) |
1 to 1.2 L/ha
|
1.2 to 1.4 L/ha
|
1.2 to 1.4 L/ha
|
| Rate per acre (product) |
0.4 to 0.48 L/ac
|
0.48 to 0.56 L/ac
|
0.48 to 0.56 L/ac
|
Precautions
- Apply when the weeds are in the 1-4 leaf stage and cereals are in the 2 to early flag leaf stage. Use the higher rate when weeds are past the 4 leaf stage.
- Spring Cereals: Best results are in the 2-5 leaf cereal stage since thorough coverage of weed foliage is required for optimum weed control.
- Winter Wheat: More effective on winder annuals when applied as a fall treatment.
| Trade Name | Refine SG (50%) | + non ionic surfactant |
|---|---|---|
| Active Ingredient |
thifensulfuron-methyl/tribenuron-methyl
|
+ non-ionic surfactant
|
| Formulation |
50%
|
|
| Rate per hectare (active) |
15 g/ha
|
0.2% v/v
|
| Rate per hectare (product) |
30 g/ha
|
2 L/1000 L
|
| Rate per acre (product) |
12 g/ac
|
2 L/1000 L
|
Precautions
- Do NOT use on winter barley, fall rye and cereals underseeded with forage crops.
- Apply when the cereal crop is in the 2 leaf to flag leaf stage.
- Winter Wheat: Apply once either in the fall or spring.
- Apply to young actively growing weeds that are less than 10 cm tall or across.
- Canada Thistle, sow thistle and round-leaved mallow are suppressed.
- IF USING REFINE EXTRA, it must be applied at a rate of 20 g/ha or 8 g/ac plus a non ionic surfactant at 2 L per 1,000 L spray solution.
| Trade Name | Target | or Tracker XP or Sword |
|---|---|---|
| Active Ingredient |
dicamba/MCPA/mecoprop
|
dicamba/MCPA/mecoprop
|
| Formulation |
400 g/L
|
400 g/L
|
| Rate per hectare (active) |
0.4 to 0.6 kg/ha
|
0.4 to 0.6 kg/ha
|
| Rate per hectare (product) |
1 to 1.5 L/ha
|
1 to 1.5 L/ha
|
| Rate per acre (product) |
0.4 to 0.6 L/ac
|
0.4 to 0.6 L/ac
|
Precautions
- Do NOT use on rye and cereals underseeds with forage crops.
- Use when spring wheat or oats are in the 2-5 leaf stage or spring barley in the 2-4 leaf stage.
- Winter Cereals: Apply in spring before the crop is more than 30 cm high (top leaf extended).
- Apply when weeds are in the 2-3 leaf stage.
Use the high rate if weeds are beyond the 3 leaf stage. - Do NOT apply when night time air temperatures are below 10°C prior to and after application.
Precautions
- For use only on winter wheat.
- Apply from the 3-tiller until the early flag leaf stage of winter wheat.
- Do NOT apply to winter wheat underseeded to red clover.
- Do NOT apply within 60 days of harvest and only once
per year.
1 Indicates product sold as a co-pack.
Precautions
- Apply MCPB/MCPA from the 2 leaf stage to flag leaf stage of spring cereals.
- Winter Cereals: Apply in the spring when the crop is in the 2 leaf to flag leaf stage.
- Use only if cereals are underseeded to red, alsike, ladino or white dutch clover and grasses.
- Apply when legumes are in the unifoliate to the 4th trifoliate leaf stage.
- Apply in 150-200 L/ha (60-80 L/ac) water.
Related Links
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Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca
| Author: | OMAFRA Staff |
|---|---|
| Creation Date: | 25 November 2002 |
| Last Reviewed: | 18 June 2010 |