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Herbicide Recommendations for Flax: Postemergence Grass Herbicides

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 20 May 2008

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

Excerpt from 2008 Publication 75, Guide to Weed Control, Order this publication

Cover of Publication 75, Guide to Weed ControlTable 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)
  8. Other Flax Weed Control Recommendations
  9. 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 to 0.072 kg/ha
0.5% v/v
Rate per hectare (product)
0.375 to 0.75 L/ha
5 L/1000 L
Rate per acre (product)
0.15 to 0.3 L/ac
5 L/1000 L
Precautions
  • 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 to 0.2 kg/ha
2 L/ha
1 L/ha 
Rate per hectare (product)
0.32 to 0.47 L/ha
2 L/ha
1 L/ha
Rate per acre (product)
0.13 to 0.19 L/ac
0.8 L/ac
0.4 L/ac

Precautions

  • Treat the 1-6 leaf stage of annual grass.
  • For annual grasses and volunteer cereals.
  • Do NOT use on low-linolenic varieties.
  • 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).

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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 to 2 L/ha
Rate per hectare (product)
1.1 L/ha
1 to 2 L/ha
Rate per acre (product)
0.45 L/ac
0.4 to 0.8 L/ac

Precautions

  • For quackgrass control. Thorough preplant tillage will ensure more uniform quackgrass emergence.
  • Do NOT use on low-linolenic varieties.
  • 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 to 0.09 kg/ha
0.5% to 1% v/v
Rate per hectare (product)
0.13 to 0.38 L/ha
5 to 10 L/1000 L
Rate per acre (product)
0.05 to 0.15 L/ac
5 to 10 L/1000 L

Precautions

  • 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.

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Venture L
Trade Name
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

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

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Venture L
Trade Name
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

  • Apply at 3-5 leaf stage of quackgrass.

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Related Links

 

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