Table 9-1. Conventional Corn (Field, Seed and Sweet ) Herbicide Weed Control Ratings: Perennial Weeds

Pub 75: Guide to Weed Control > Corn > Table 9-1. Conventional Corn (Field, Seed and Sweet) Herbicide Weed Control Ratings: Perennial Weeds

Excerpt from 2010-11 Chapter 9, Publication 75, Guide to Weed Control, Order this publication

Table of Contents

1. Soil Applied Grass and Broadleaf Herbicides (Preemergence Timing Only)
2. Soil Applied Tank-Mixes (Preemergence Timing Only)
3. Soil Applied Broadleaf Herbicides (Preemergence Timing Only)
4. Soil Applied and Early Postemergence Grass Herbicides
5. Soil Applied and Early Postemergence Grass and Broadleaf Herbicides
6. Soil Applied and Early Postemergent Tank-Mixes
7. Postemergence Grass Herbicides
8. Postemergence Broadleaf Herbicides
9. Postemergence Tank-Mixes
10. Other recommendations in Table 9-1: Conventional Corn (Field, Seed and Sweet) Herbicide Weed Control Ratings
    • Annual Grasses
    • Annual Broadleaf Weeds
    • Table 9-1 (PDF file - 84 kb)
11. Corn Leaf Stages
12. Why is Early Season Weed Control so Important in Corn?
13. Related Links

NOTES: Weed control ratings are given as 0-9 where 0 indicates no control, and 9 indicates 90-100% control under ideal conditions. Ratings are subjective values based on best available information and given general comparisons based on use as described in this guide. Crop tolerance ratings are: E - Excellent, G - Good, F - Fair, P - Poor. Under unfavourable conditions (e.g. too dry, too wet, too cold or poor application) the herbicides may not be as effective as indicated. Ratings may vary with weed and crop stage and with the timing and rates of the product(s) being used. Ratings in BOLD indicate the weed is listed on the product label for control or suppression. Please see product label for more information on registered weed species, product uses and precautions.

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Soil Applied Grass and Broadleaf Herbicides (Preemergence Timing Only)

Trade Name	Field Bindweed	Horsetail	Milkweed	Nut sedge	Quackgrass	Sow-thistle	Canada thistle
Princep Nine-T, Simadex, Simazine 480 (E) (sd,sw,fd)	2	0	0	5	5	2	2

***Crop tolerance rating: E - Excellent, G - Good, F - Fair, P - Poor
****Crop Registrations: fd - field corn, sw - sweet corn, sd - seed corn

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Soil Applied Tank-Mixes (Preemergence Timing Only)

Trade Name	Field Bindweed	Horsetail	Milkweed	Nut sedge	Quackgrass	Sow-thistle	Canada thistle
Dual II Magnum + Lorox + atrazine** (E) (sw)	0	0	0	7	0	0	0
Primextra II Magnum + Lorox (E) (fd)	0	0	0	7	0	0	0

** - Various formulations available, see Table 1, Herbicides Used in Ontario.
***Crop tolerance rating: E - Excellent, G - Good, F - Fair, P - Poor
****Crop Registrations: fd - field corn, sw - sweet corn, sd - seed corn

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Soil Applied Broadleaf Herbicides (Preemergence Timing Only)

Trade Name	Field Bindweed	Horsetail	Milkweed	Nut sedge	Quackgrass	Sow-thistle	Canada thistle
atrazine** (E) (sd,sw,fd)	2	0	0	0	2	2	0
Banvel II, Oracle (G) (fd)	2*	0	0	0	0	2*	2*
Callisto + atrazine (E) (sd,sw,fd)	2	0	0	0	0	0	0
Marksman or Propero (G) (fd)	2*	0	0	0	2	2*	2*

* - Indicates the weed is listed on the product label for control or suppresssion.
** - Various formulations available, see Table 4-1, Herbicides Used in Ontario.
***Crop tolerance rating: E - Excellent, G - Good, F - Fair, P - Poor
****Crop Registrations: fd - field corn, sw - sweet corn, sd - seed corn

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Soil Applied and Early Postemergence Grass Herbicides

Trade Name	Field Bindweed	Horsetail	Milkweed	Nut sedge	Quackgrass	Sow-thistle	Canada thistle
Dual II Magnum (E)*** (sd,sw,fd)****	0	0	0	8b*	0	0	0
Frontier Max (E) (sd,sw,fd)	0	0	0	8b*	0	0	0
Prowl (E) (fd)	–	–	–	–	–	–	–

* - Indicates the weed is listed on the product label for control or suppresssion.
^b - Use PPI timing for optimum control.
– Insufficient information available to make a rating.
***Crop tolerance rating: E - Excellent, G - Good, F - Fair, P - Poor
****Crop Registrations: fd - field corn, sw - sweet corn, sd - seed corn

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Soil Applied and Early Postemergence Grass and Broadleaf Herbicides

Trade Name	Field Bindweed	Horsetail	Milkweed	Nut sedge	Quackgrass	Sow-thistle	Canada thistle
Battalion1 (G)*** (fd)****	–	–	–	–	7e	7e	–
Converge XT1 Converge Flex + atrazine** (G) (fd)	–	0	0	0	0	0	0
Primextra II Magnum (E) (sd,sw,fd)	0	0	0	8b*	0	0	0

* - Indicates the weed is listed on the product label for control or suppresssion.
^b - Use PPI timing for optimum control.
^e - Weed must be emerged to achieve this level of control.
– Insufficient information available to make a rating.
** - Various formulations available, see Table 4-1, Herbicides Used in Ontario.
¹ - Indicates herbicides sold as a co-pack under this trade name.
***Crop tolerance rating: E - Excellent, G - Good, F - Fair, P - Poor
****Crop Registrations: fd - field corn, sw - sweet corn, sd - seed corn

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Soil Applied and Early Postemergence Tank-Mixes

Trade Name	Field Bindweed	Horsetail	Milkweed	Nut sedge	Quackgrass	Sow-thistle	Canada thistle
Dual II Magnum + Banvel II or Oracle (G) (fd)	8e*	0	0	8b*	0	9e*	8e*
Dual II Magnum + Callisto + atrazine** (E) (fd)	2	0	0	8b*	0	0	0*
Dual II Magnum + Marksman or Propero (G) (fd)	8e*	0	0	8b*	0	8e	8e*
Frontier Max + atrazine**(E) (sw)	2	0	0	8b*	2	2	0
Frontier Max + Banvel II (G) (fd)	8e*	0	0	8b*	0	9e*	8e*
Frontier Max + Marksman (E) (fd)	8e*	0	0	8b*	0	8e	8e*
Primextra II Magnum + Banvel II or Oracle (G) (fd)	8e*	0	0	8b*	0	8e	8e*
Primextra II Magnum + Callisto (E) (sd,sw,fd)	2	0	0	8b*	0	0	0*
Prowl + atrazine**(E) (fd)	2	–	–	–	2	2	–
Prowl + Banvel II or Oracle (E) (fd)	–	–	–	–	–	–	–
Prowl + Marksman (E) (fd)	–	–	–	–	–	–	–

– Insufficient information available to make a rating.
* - Indicates the weed is listed on the product label for control or suppresssion.
** - Various formulations available, see Table 4-1, Herbicides Used in Ontario.
^b - Use PPI timing for optimum control.
^e - Weed must be emerged to achieve this level of control.
***Crop tolerance rating: E - Excellent, G - Good, F - Fair, P - Poor
****Crop Registrations: fd - field corn, sw - sweet corn, sd - seed corn

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Postemergence Grass Herbicides

Trade Name	Field Bindweed	Horsetail	Milkweed	Nut sedge	Quackgrass	Sow-thistle	Canada thistle
Accent (E) (sd,sw3,fd)	0	0	0	0	9*	0	0
Ultim (G) (fd)	–	–	7	–	9*	–	–

– Insufficient information available to make a rating.
* - Indicates the weed is listed on the product label for control or suppresssion.
***Crop tolerance rating: E - Excellent, G - Good, F - Fair, P - Poor
****Crop Registrations: fd - field corn, sw - sweet corn, sd - seed corn

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Postemergence Broadleaf Herbicides

Trade Name	Field Bindweed	Horsetail	Milkweed	Nut sedge	Quackgrass	Sow-thistle	Canada thistle
2,4-D** (F)*** (fd)****	7	0	0	0	0	8	8
2,4-DB** (Caliber, Cobutox, Embutox) (G) (fd)	8	0	0	0	0	8	8
atrazine** + oil (G) (sd,sw,fd)	7	5	2	5	5	7	2
Banvel II, Oracle (G) (fd)	8*	0	0	0	0	9*	8*
Basagran Forté (E) (sd,sw,fd)	6*	0	0	6*	0	6	8*
Buctril M, Badge, Logic M, Mextrol (F) (sd,sw,fd)	7	7	0	0	0	7*	7*
Callisto + atrazine** (E) (fd)	2	0	0	0	0	0	0
Distinct (E) (fd)	8	0	0	0	0	9	9
Impact + atrazine ** (E) (sd, sw)	–	–	–	–	–	–	–
Laddok (E) (sd,sw,fd)	7	0	0	6*	0	7	7
Marksman or Propero (E) (fd)	8*	0	0	0	0	8	8*
MCPA** (P) (fd)	7	6	0	0	0	7	7
Pardner, Koril (E) (sw,sd,fd)	7	0	0	0	0	7	7
Peakplus1 (E) (fd)	–	–	–	0	0	–	–
Shotgun (G) (fd)	0	–	0	0	0	–	–
Tropotox Plus, Clovitox Plus, Topside (G) (fd)	8*	0	0	0	0	8*	8*

– Insufficient information available to make a rating.
** - Various formulations available, see Table 4-1, Herbicides Used in Ontario.
¹ - Indicates herbicides sold as a co-pack under this trade name.
***Crop tolerance rating: E - Excellent, G - Good, F - Fair, P - Poor
****Crop Registrations: fd - field corn, sw - sweet corn, sd - seed corn

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Postemergence Tank-Mixes

Trade Name	Field Bindweed	Horsetail	Milkweed	Nut sedge	Quackgrass	Sow-thistle	Canada thistle
Accent + Banvel II (G) (fd)	8*	0	0	0	9*	9*	8*
Accent + Callisto + atrazine** (E) (fd)	2	0	0	0	9*	0	0
Accent + Distinct, Accent Total1 (E) (fd)	8	0	6	0	9*	9	9*
Accent + Marksman (E) (fd)	8*	0	0	0	9*	8	8*
Accent + Pardner (E) (fd)	7	0	0	0	9*	7	7
Accent + Peakplus1, Accent One Pass1 (E) (fd)	5	0	0	0	9*	0	0
Accent + Shotgun (G) (fd)	0	–	0	0	9*	–	–
atrazine** + Banvel II or Oracle (G) (fd)	8*	5	2	5	5	9*	8*
atrazine** + Buctril M or Badge, or Logic M or Mextrol (G) (fd)	7	7	2	5	5	7*	7*
atrazine** + Pardner or Koril (E) (sd,sw,fd)	7	5	2	5	5	7	2
Banvel II or Oracle + 2,4-D** (G) (fd)	8*	0	0	0	0	9*	8*
Banvel II or Oracle + Pardner, Koril or Brotex (G) (fd)	8*	0	0	0	0	9*	8*
Impact + Frontier Max + atrazine** (E) (fd)	–	–	–	–	–	–	–
Option 1.2.3. (E) (fd)	-	0	0	0	–	–	–
Option + atrazine** (E) (fd)	7	5	2	5	7/8*	7	2
Option + Banvel II (E) (fd)	8	0	0	0	9*	9*	8*
Option + Callisto + atrazine** (E) (fd)	2	0	0	0	9*	0	0
Option + Distinct (E) (fd)	8	0	0	0	9*	0	0
Option + Marksman (E) (fd)	8	–	–	0	7/8*	8	8*
Option + Pardner + atrazine** (E) (fd)	7	5	2	5	8*	7	5
Option + Peakplus1 (E) (fd)	–	–	7	0	9*	–	–
Prowl + Accent + Banvel II or Oracle (G) (fd)	–	–	–	–	–	–	–
Prowl + Shotgun (E) (fd)	0	–	0	0	0	–	–
Ultim + Banvel II or Oracle (G) (fd)	8*	0	0	0	9*	9*	8*
Ultim + Callisto + atrazine** (G) (fd)	–	–	7	–	9*	–	–
Ultim + Distinct, Ultim Total1 (G) (fd)	8	8*	6	0	9*	9	9
Ultim + Marksman (G) (fd)	8*	0	0	0	9*	8	8*
Ultim + Pardner (G) (fd)	7	0	0	0	9*	7	7
Ultim + Pardner + atrazine** (G) (fd)	7	5	2	5	9*	7	2
Ultim + Peakplus1 (G) (fd)	–	–	7	–	9*	–	–
Ultim + Shotgun (G) (fd)	0	–	7	0	9*	–	–

– Insufficient information available to make a rating.
* - Indicates the weed is listed on the product label for control or suppresssion.
** - Various formulations available, see Table 4-1, Herbicides Used in Ontario.
¹ - Indicates herbicides sold as a co-pack under this trade name.
*** Crop tolerance rating: E - Excellent, G - Good, F - Fair, P - Poor
**** Crop Registrations: fd - field corn, sw - sweet corn, sd - seed corn

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Related Links

• Weeds in Ontario
• Corn in Ontario
• Problem Weed Control in Field Crops
• Integrated Pest Management (IPM)
• Pesticide Application and Safety
• Pesticide Companies and Agents
• OMAFRA Sprayer Calibration Calculator
• Search the PMRA website
• OMAFRA Publication 505: Ontario Weeds
• OMAFRA Publication 75: Guide To Weed Control