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Herbicide Recommendations for Corn: Postemergence Grass and Broadleaf Herbicides - Roundup Ready (glyphosate tolerant) hybrids only

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 and Broadleaf Herbicides - for Roundup Ready (glyphosate tolerant) hybrids only

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. Glyphosate
  2. Corn Herbicide Weed Control Ratings (Table 9-1) (PDF file - 214kb)
  3. Other Herbicide Recommendations for Corn
  4. Corn Leaf Stages
  5. Related Links
Glyphosate
Trade Name glyphosate
Active Ingredient
glyphosate
or glyphosate
or glyphosate
Formulation
360 g/L
480 g/L
540 g/L
Rate per hectare (active)
0.9 kg/ha
0.9 kg/ha
0.9 kg/ha
Rate per hectare (product)
2.5 to 5 L/ha
1.875 to 3.75 L/ha
1.67 to 3.34 L/ha
Rate per acre (product)
1 to 2 L/ac
0.75 to 1.5 L/ac
0.67 to 1.34 L/ac

Precautions

  • Use ONLY with pedigreed (certified) corn seed designated as glyphosate tolerant or "Roundup Ready Corn".
    See Table 4-2 for a list of registered glyphosate products.
  • Apply up to and including the 8-leaf stage of corn.
  • The initial application is recommended between the 2-6 leaf stage (3-5 leaf is optimum timing) to remove early competition. A second application may be applied up to the 8-leaf stage of corn (8-leaf fully expanded).
  • Use 100-200 L/ha (40-80 L/ac) of water.

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