Flax: Postemergence Broadleaf Herbicides

Table of Contents

1. Basagran + Assist
2. Buctril M or Badge, Logic M, Mextrol
3. MCPA Amine
4. Flax Herbicide Ratings Tables (Table 12-1) (PDF 93 kb)
   • Annual Grasses
   • Annual Broadleaf Weeds
   • Perennial Weeds
5. Related Links

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

• Apply when flax is 5 cm or higher and weeds are small and actively growing.
• Top growth of nutsedge and Canada thistle is controlled and field bindweed may be suppressed. Two applications of 1.75 L/ha (0.7 L/ac) (0.84 kg active/ha), 10 days apart may be required.
• A new flush of weeds may emerge after the first flush has been controlled.
• Cool weather or drought may reduce control.
• Reduce oil concentrate to 1 L/ha (0.4 L/ac) under abnormally hot and humid weather conditions or temporary crop injury may occur.

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  Buctril M or Badge, Logic M, Mextrol

  Trade Name	Buctril M	or Badge, Logic M, Mextrol
  Active Ingredient	bromoxynil/MCPA	or bromoxynil/MCPA
  Formulation	560 g/L (1:1)	450 g/L (1:1)
  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 (For more information, see Chapter 4. Herbicides Used in Ontario, page 23 and Chapter 5. Notes on Adjuvants, page 69).

• Apply when the flax is 5-10 cm high before weeds have developed beyond the 4 leaf stage.
• Do NOT use if the daytime temperature is over 29°C.

MCPA Amine

Trade Name	MCPA Amine
Active Ingredient	MCPA
Formulation	500 g/L
Rate per hectare (active)	0.5 kg/ha
Rate per hectare (product)	1 L/ha
Rate per acre (product)	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).

• Flax may be treated when 5 cm tall to bud stage.
• Best weed control is obtained if the application is made when the weeds are small (approx. 5 cm tall).

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