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Herbicide Recommendations for Corn: Postemergence Grass Herbicides

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 10 May 2008

Pub 75: Guide to Weed Control > Corn > Herbicide Recommendations for Corn: Postemergence Grass Herbicides

Excerpt from 2008 Chapter 9, Publication 75, Guide to Weed Control, Order this publication

Cover of Publication 75, Guide to Weed ControlTable of Contents

  1. Accent + non-ionic surfactant + liquid urea ammonium nitrate (UAN)
  2. Accent + non-ionic surfactant
  3. Dual II Magnum
  4. Frontier
  5. Ultim + non-ionic surfactant
  6. Corn Herbicide Weed Control Ratings (Table 9-1) (PDF file - 214kb)
  7. Other Herbicide Recommendations for Corn
  8. Corn Leaf Stages
  9. Related Links
Accent + non-ionic surfactant + liquid urea ammonium nitrate (UAN)
Trade Name Accent + non-ionic surfactant + liquid urea ammonium nitrate (UAN)
Active Ingredient
nicosulfuron
+ non-ionic surfactant
+ liquid urea ammonium nitrate
Formulation
75 DF
 
 
Rate per hectare (active)
25 g/ha
0.2% v/v
5 L/ha
Rate per hectare (product)
33 g/ha
2 L/1000 L
5 L/ha
Rate per acre (product)
13 g/ac
2 L/1000 L
2 L/ha

Precautions

  • Do NOT add liquid urea ammonium nitrate (UAN) when applying ACCENT to seed or sweet corn.
  • For use on all sweet corn varieties, however not all varieties have been tested. Contact the variety manufacturer for more information on the tolerance of a specific variety.
  • Adding UAN will give improved control of yellow foxtail in Field Corn.
  • Adapt oil concentrate (1% v/v), Merge or Sure-Mix (0.5% v/v) can be used in place of a non-ionic surfactant.
  • Always add water soluble packages to clean water with the agitator running. Corn should be within the 1-8 leaf stage of growth. Apply Accent when annual grasses are in the 1-6-leaf stage and/or quackgrass is in the 3-6 leaf stage (10-20 cm).

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Dual II Magnum
Trade Name
Active Ingredient s-metolachlor/benoxacor
Formulation 915 g/L
Rate per hectare (active) 1.14 to 1.6 kg/ha
Rate per hectare (product) 1.25 to 1.75 L/ha
Rate per acre (product) 0.5 to 0.7 L/ac

Precautions

  • Corn should be at the spike to 2- leaf stage and annual grasses not beyond 2-leaf stage.
  • Do NOT add oil or surfactants.

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Frontier
Trade Name
Active Ingredient dimethanamid
Formulation 900 g/L
Rate per hectare (active) 1 to 1.25 kg/ha
Rate per hectare (product) 1.1 to 1.4 L/ha
Rate per acre (product) 0.44 to 0.56 L/ac

Precautions

  • Annual grasses should not be beyond the 2-leaf stage and corn should be at the spike to 3-leaf stage.
  • Do NOT add oil or surfactants.
  • Do NOT use on seed corn, popcorn or sweet corn.

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Ultim + non-ionic surfactant
Trade Name Ultim  + non-ionic surfactant
Active Ingredient
nicosulfuron/rimsulfuron
+ non-ionic surfactant
Formulation
75 DF (1:1)
 
Rate per hectare (active)
25 g/ha
0.2% v/v
Rate per hectare (product)
33 g/ha
2 L/1000 L
Rate per acre (product)
13 g/ac
2 L/1000 L

Precautions

  • Apply one water soluble bag/ha of Ultim. Always add water soluble packages to clean water with the agitator running. Corn should be within the 1-6 leaf stage (30 cm). Apply Ultim when annual grasses are in the 1-6 leaf stage, and/or quackgrass is in the 3-6 leaf stage (10-20 cm).
  • ONLY apply Ultim when air temperatures in the 24 hours before and after application ranges between 5ºC and 28ºC .
  • Do NOT use on seed corn or sweet corn.

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Related Links

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