Herbicide Recommendations for Barley, Oats and Wheat (Spring), Not Underseeded to Forage Crops: Postemergence Broadleaf Herbicides

Table of Contents

1. 2,4-D
2. Banvel II or Oracle
3. Buctril M, Mextrol, or Badge
4. Caliber, Cobutox or Embutox
5. Dyvel
6. Estaprop, Dichlorprop D or Turboprop
7. Infinity
8. Lontrel 360
9. MCPA Amine
10. Mecoprop or Compitox
11. Pardner or Koril
12. Refine Extra + Agral 90
13. Target or Sword
14. Tropotox Plus, Clovitox Plus or or Topside
15. Cereal Herbicide Rating Table (Table 8-1) (PDF 30 kb)
    • Annual Grasses
    • Annual Broadleaf Weeds
    • Perennial Weeds
16. Other Cereal Crop Weed Control Recommendations
• Barley, Oats and Wheat (Spring)
• Wheat (Winter) and Fall Rye
17. Stages of Cereal Development
18. Related Links

Precautions

• Apply when the crop is in the 3-5 leaf stage of growth.

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Precautions

• Best performance when weeds are in the 2-3 leaf stage or rosettes less than 5 cm diameter. Use the higher rates on older weeds.
• Apply to wheat and barley when they are in the 2-5 leaf stage.
• Avoid spraying under conditions of fog or high humidity or when temperature is exceeding 30°C.

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Precautions

• Apply when weeds are in the 1-4 leaf stage and cereals are in the 2 to early flag leaf stage.
• Wild buckwheat, common ragweed, mustards and lamb's-quarters are controlled up to the 8 leaf stage.
• 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.

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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.

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Precautions

• Apply when cereals are in the 2-5 leaf stage.
• Hempnettle, corn spurry and cow cockle are controlled best when application is made early in this stage.

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Precautions

• For spring wheat and barley only.
• Do NOT apply on oats.
• Apply to emerged weeds when the cereals are in the 4-leaf to early flag leaf stage.

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Infinity

Precautions

• 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 apply to cereals underseeded with legume crops.
• Do NOT harvest wheat or barley for grain or straw within 45 days of application.

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• Apply when wheat or barley are at the 3-leaf to flag leaf emergence stages.
• Not registered for use on oats in Eastern Canada.
• For the control of Canada thistle and perennial sow-thistle (top growth only).

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MCPA Amine

Trade Name	MCPA Amine
Active Ingredient	MCPA
Formulation	500 g/L
Rate per hectare (active)	0.35 to 0.85 kg/ha
Rate per hectare (product)	0.7 to 1.7 L/ha
Rate per acre (product)	0.28 to 0.68 L/ac

Precautions

• Apply when the crop is in the 2-5 leaf stage of growth.
• For hempnettle control, use the high rate of MCPA.

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Mecoprop or Compitox

Trade Name	Mecoprop or Compitox
Active Ingredient	mecoprop-P
Formulation	150 g/L
Rate per hectare (active)	0.83 to 1.05 kg/ha
Rate per hectare (product)	5.5 to 7 L/ha
Rate per acre (product)	2.2 to 2.8 L/ac

Precautions

• 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.

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Pardner or Koril

Trade Name	Pardner	or Koril
Active Ingredient	bromoxynil	or bromoxynil
Formulation	280 g/L	235 g/L
Rate per hectare (active)	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
Rate per acre (product)	0.4 to 0.48 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.
• Best results are in the 2-5 leaf cereal stage since thorough coverage of weed foliage is required for optimum weed control.

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Refine Extra + Agral 90

Trade Name	Refine Extra	+ Agral 90
Active Ingredient	thifensulfuron-methyl/tribenuron-methyl	+ non-ionic surfactant
Formulation	75 DF
Rate per hectare (active)	15 g/ha	0.2% v/v
Rate per hectare (product)	20 g/ha	2 L/1000 L
Rate per acre (product)	8 g/ac	2 L/1000 L

Precautions

• Apply when the crop is in the 2-leaf to flag leaf (shot blade) stage.
• 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.
• Always add water soluble packages to clear water with agitator running.
• Do NOT use on Leger Barley and Belvedere Wheat.

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Target or Tracker or Sword

Trade Name	Target	or Tracker 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

• Use when wheat or oats are in the 2-5 leaf stage or barley in the 2-4 leaf stage.
• Apply when weeds are in the 2-3 leaf stage.
• Use the high rate if weeds are beyond the 3-leaf stage.

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Tropotox Plus, Clovitox Plus or Topside

Trade Name	Tropotox Plus or Clovitox Plus or Topside
Active Ingredient	MCPB/MCPA
Formulation	400 g/L
Rate per hectare (active)	1.1 to 1.7 kg/ha
Rate per hectare (product)	2.75 to 4.25 L/ha
Rate per acre (product)	1.1 to 1.7 L/ac

Precautions

• Apply MCPB/MCPA from the 2 leaf stage to flag leaf stage of cereals.

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Related Links

• Weeds in Ontario
• Cereal Crops in Ontario - Barley, Oats, Wheat
• Problem Weed Control in Field Crops
• Pesticide Companies and Agents
• OMAFRA Sprayer Calibration Calculator
• Search the PMRA website
• OMAFRA Publication 505: Ontario Weeds
• OMAFRA Publication 75: Guide To Weed Control

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