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Herbicide Recommendations for Sunflowers: 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 Sunflowers: 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. Poast Ultra + Assist or Merge
  2. Poast Ultra + Merge
  3. Select + Amigo
  4. Venture L for volunteer corn
  5. Venture L for annual grasses and quackgrass
  6. Sunflower Herbicide Ratings Tables (Table 12-1) (PDF 93 kb)
  7. Other Sunflower Weed Control Recommendations
  8. Related Links

Poast Ultra + Assist or Merge
Trade Name
Active Ingredient
sethoxydim
+ oil concentrate 
or surfactant/solvent 
Formulation
450 g/L
 
 
Rate per hectare (active)
0.15 to 0.2 kg/ha
2 kg/ha
1 kg/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.
  • Use the higher rate when volunteer cereals are present.
  • Use Merge for conditions or weeds requiring medium to high rates of Poast Ultra.
  • Sunflowers are 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
Active Ingredient
sethoxydim
+ surfactant/solvent
Formulation
450 g/L
 
Rate per hectare (active)
0.5 kg/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.
  • Apply using 100-200 L/ha of water (40-80 L/ac).

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Select + Amigo
Trade Name
Active Ingredient
clethodim
+ surfactant
Formulation
240 g/L
 
Rate per hectare (active)
0.03 to 0.09 kg/ha
0.5% 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.
  • Allow 72 days between application and harvest.

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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

  • This rate is for control of volunteer corn only
  • Apply at 2-5 leaf stage of the volunteer corn.

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Venture L
Trade Name
Active Ingredient fluazifop-p-butyl
Formulation 125 g/L
Rate per hectare (active) 0.125 to 0.18 kg/ha
Rate per hectare (product) 1.0 to 1.4 L/ha
Rate per acre (product) 0.4 to 0.57 L/ac

Precautions

  • Apply at 2-4 leaf stage of annual grasses and at 3-5 leaf stage quackgrass.

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Related Links

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