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Table 9-6. Maximum Weed Leaf Stages (or Height) for Postemergence Herbicide Application in Corn

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

Pub 75: Guide to Weed Control > Corn > Table 9-6. Maximum Weed Leaf Stages (or Height) for Postemergence Herbicide Application in Corn

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. Application Window (Corn Leaf-over Stage)
  2. Maximum Leaf Stage of Annual Grasses
  3. Maximum Leaf Stage of Annual Broadleaf Weeds
  4. Maximum Leaf Stage of Perennials (quackgrass)
  5. Table 9-6: Maximum Weed Leaf Stages (or Height) for Postemergence Herbicide Application in Corn - PDF (87 kb)
  6. Related Links

Application Window (Corn Leaf-over Stage) & Maximum Leaf Stage of Quackgrass

Postemergence Grass Herbicides
Trade Name Application Window
(Corn Leaf-over Stage)		 Maximum Leaf Stage of Quackgrass
Accent 1-8 leaf 3-6 leaves
Dual II Magnum PRE - 3 leaf -
Frontier PRE - 3 leaf 1-4 leaves
Ultim 1-6 leaf -

Postemergence Broadleaf Herbicides
Trade Name Application Window
(Corn Leaf-over Stage)		 Maximum Leaf Stage of Quackgrass
atrazine** tolerant at all stages -
Banvel II or Oracle up to 5 leaf -
Buctril M, Mextrol or Badge 4-6 leaf -
Callisto + atrazine** 3-8 leaf -
Distinct 2-6 leaf -
Impact + atrazine** 1-7 leaf -
Marksman up to 5 leaf -
Pardner, Koril 4-8 leaf -
Pardner, Koril + atrazine** 4-8 leaf -
PeakPlus1 up to 6 leaf -
Shotgun spike-4 leaf -
Summit 2-7 leaf 6 leaves

Postemergence Grass and Broadleaf Herbicides
Trade Name Application Window
(Corn Leaf-over Stage)		 Maximum Leaf Stage of Quackgrass
Accent One Pass1 1-7 leaf 3-6 leaves
Accent Total1 2-8 leaf 3-6 leaves
Battalion1 PRE - 3 leaf 3 leaves
Galaxy1,2 1-6 leaf 8 leaves
glyphosate**2 up to 8 leaf -
Impact + Frontier + atrazine** 1-7 leaf -
Liberty up to 8 leaf 1-4 leaves
Option 2.25 OD up to 8 leaf 6 leaves
Primextra II Magnum PRE - 3 leaf -
Ultim Total 2-6 leaf 3-6 leaves
1 - Indicates herbicide sold as a "co-pack" under this name.
2 - For use only on glyphosate tolerant (Roundup Ready) corn hybrids.
** - Various formulations available, see Table 4-1, Herbicides Used in Ontario.

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Maximum Leaf Stage of Annual Grasses

Postemergence Grass Herbicides
Trade Name Barnyard Grass Crab-
grass		 Fall Panicum Green Foxtail Old Witch Grass Proso Millet
Accent 6 - 6 6 6 6
Dual II Magnum 1 1 1 1 1 1
Frontier 1 1 1 1 1 1
Ultim 6 - 6 6 6 6
All numbers expressed as leaf stages except as indicated.
- Indicates that either the weed is not controlled by the corresponding herbicide, or not enough data is available to specify a maximum leaf stage.

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Postemergence Broadleaf Herbicides
Trade Name Barnyard Grass Crab-
grass		 Fall Panicum Green Foxtail Old Witch Grass Proso Millet
atrazine - - - - - -
Banvel II or Oracle - - - - - -
Buctril M, Mextrol or Badge - - - - - -
Callisto + atrazine** - - - - - -
Distinct - - - - - -
Impact + atrazine** 4 - - 4 - -
Marksman - - - - - -
Pardner, Koril - - - - - -
Pardner, Koril+ atrazine - - - - - -
PeakPlus1 - - - - - -
Shotgun - - - - - -
Summit - - - - - -

All numbers expressed as leaf stages except as indicated.
- Indicates that either the weed is not controlled by the corresponding herbicide, or not enough data is available to specify a maximum leaf stage.
1 - Indicates herbicide sold as a "co-pack" under this name.

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Postemergence Grass and Broadleaf Herbicides
Trade Name Barnyard Grass Crab-
grass		 Fall Panicum Green Foxtail Old Witch Grass Proso Millet
Accent One Pass1 6 - 6 6 6 6
Accent Total1 6 - 6 6 6 6
Battalion1 3 PRE 3 3 3 3
Galaxy1,2 8 8 8 8 8 8
glyphosate**2 8 8 8 8 8 8
Impact + Frontier + atrazine** 4 - - 4 - -
Liberty 5 5 4 5 4 5
Option 2.25 OD 6 - 4 5 4 5
Primextra II Magnum 2 2 2 2 2 2
Ultim Total 6 - 6 6 6 6

1 - Indicates herbicide sold as a "co-pack" under this name.
2 - For use only on glyphosate tolerant (Roundup Ready) corn hybrids.
- Indicates that either the weed is not controlled by the corresponding herbicide, or not enough data is available to specify a maximum leaf stage.

** - Various formulations available, see Table 4-1, Herbicides Used in Ontario.

 

Maximum Leaf Stage of Annual Broadleaf Weeds

Postemergence Grass Herbicides
Trade Name Wild buck-wheat Cockle-
bur		 Jimson-
weed		 Lady's-thumb Lamb's-quarters Wild mus-tard Night-
shade		 Pig-
weed		 Rag-
weed		 Velvet-
leaf
Accent - - - -   - - - - -
Dual II Magnum - - - - - - PRE PRE - -
Frontier - - - - - - PRE PRE - -
Ultim - - - - - - - 6 - -

All numbers expressed as leaf stages except as indicated.
- Indicates that either the weed in not controlled by this herbicide, or not enough data is available to specify a maximum leaf stage

Postemergence Broadleaf Herbicides
Trade Name Wild buck-wheat Cockle-
bur		 Jimson-
weed		 Lady's-thumb Lamb's-quarters Wild mus-tard Night-
shade		 Pig-
weed		 Rag-
weed		 Velvet-
leaf
atrazine* PRE - 10 cm 10 cm 10 cm 10 cm 10 cm 10 cm 7-10 cm 5-10 cm
Banvel II or Oracle 4 4 4 4 4 4 4 4 4 4
Buctril M, Mextrol or Badge 8 4 - 4 8 8 - 4 8 4
Callisto + atrazine** 8 4 4 8 8 - 8 8 6 8
Distinct 6 6 6 6-8 6 6 6 6 6 6
Impact + atrazine** - - 5 - 8 8 8 8 8 8
Marks-man 4 4 4 4 4 4 4 4 4 4
Pardner, Koril 8 4 - 4 8 4 - 4 4 4
Pardner, Koril + atrazine 8 4 - 4 8 4 - 6 8 6
PeakPlus1 - 6 5 4 6 12 - 6 8 6
Shotgun 6 - - 6 6 6 - 6 6 6
Summit - - 5 - 6 7 - 8 6 4
All numbers expressed as leaf stages except as indicated.
- Indicates that either the weed in not controlled by this herbicide, or not enough data is available to specify a maximum leaf stage
Postemergence Grass and Broadleaf Herbicides
Trade Name Wild buck-wheat Cockle-
bur		 Jimson-
weed		 Lady's-thumb Lamb's-quarters Wild mus-tard Night-
shade		 Pig-
weed		 Rag-
weed		 Velvet-
leaf
Accent One Pass1 - 6 - 4 6 12 - 6 8 6
Accent Total1 6 6 6 6-8 6 6 6 6 6 6
Battalion1 4 4 4 4 4 4 4 4 4 4
Galaxy1,2 8 8 8 8 8 8 8 8 8 8
glypho-sate 8 8 8 8 8 8 8 8 8 8
Impact + Frontier + atrazine** - - 5 - 8 8 8 8 8 8
Liberty - 4 - 6 6 4 - 6 7 4
Option 2.25 OD - - - - 8 7 5 7 4 4
Primextra II Magnum PRE - 2 2 2 2 2 2 2 2
Ultim Total 6 6 6 6-8 6 6 6 6 6 6

1 - Indicates herbicide sold as a "co-pack" under this name.
2 - For use only on glyphosate tolerant (Roundup Ready) corn hybrids.
- Indicates that either the weed is not controlled by the corresponding herbicide, or not enough data is available to specify a maximum leaf stage.
** - Various formulations available, see Table 4-1, Herbicides Used in Ontario.

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Related Links

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