Flax: Postemergence Grass Herbicides

Pub 75: Guide to Weed Control > Other Field Crops > Flax: Postemergence Grass Herbicides

Excerpt from 2010-2011 Publication 75, Guide to Weed Control, Order this publication

Table of Contents

1. Assure II + Sure-Mix
2. Poast Ultra + Assist or Merge
3. Poast Ultra + Merge
4. Select + Amigo
5. Venture L for annual grasses
6. Venture L for quackgrass
7. Flax Herbicide Ratings Tables (Table 12-1) (PDF 93 kb)
   • Annual Grasses
   • Annual Broadleaf Weeds
   • Perennial Weeds
8. Related Links

Assure II + Sure-Mix

Trade Name	Assure II	+ Sure-Mix
Active Ingredient	quizalofop-p-ethyl	+ oil concentrate
Formulation	96 g/L
Rate per hectare (active)	0.036 - 0.072 kg/ha	0.5% v/v
Rate per hectare (product)	0.375 - 0.75 L/ha	5 L/1,000 L
Rate per acre (product)	0.15 - 0.3 L/ac	5 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 to emerged annual grasses and volunteer cereals in the 2 leaf to tillering stage and to quackgrass in the 2-6 leaf stage of growth.
• Use the 0.375 L/ha (0.15 L/ac) rate for control of volunteer corn, volunteer cereals and green foxtail.
• The 0.5 L/ha (0.2 L/ac) rate provides suppression of quackgrass and will also control barnyard grass.
• Use the 0.75 L/ha (0.3 L/ac) rate for control of quackgrass.
• Do NOT apply to flax within 82 days of harvest.

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  Poast Ultra + Assist or Merge

  Trade Name	Poast Ultra	+ 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 L/ha	1 L/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).

• Do NOT use on low-linolenic varieties.
• 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).

Poast Ultra + Merge

Trade Name	Poast Ultra	+ Merge
Active Ingredient	sethoxydim	+ surfactant/solvent
Formulation	450 g/L
Rate per hectare (active)	0.5 kg/ha	1 - 2 L/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).

• Do NOT use on low-linolenic varieties.
• 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	Select	+ Amigo
Active Ingredient	clethodim	+ surfactant
Formulation	240 g/L
Rate per hectare (active)	0.03 - 0.09 kg/ha	0.5% - 1% v/v
Rate per hectare (product)	0.13 - 0.38 L/ha	5 - 10 L/1,000 L
Rate per acre (product)	0.05 - 0.15 L/ac	5 - 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.
• Flax is tolerant at any growth stage.

Venture L

Trade Name	Venture L
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).

• Apply at 2-4 leaf stage of annual grasses.

Venture L

Trade Name	Venture L
Active Ingredient	fluazifop-p-butyl
Formulation	125 g/L
Rate per hectare (active)	0.25 kg/ha
Rate per hectare (product)	2 L/ha
Rate per acre (product)	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).

• Apply at 3-5 leaf stage of 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