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

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

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 Postemergence 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 Broadleaf Weeds
    • Perennial 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.

Preplant Burndown Herbicides - Refer to Tables 6-1, Non-Selective Herbicides Available for Preplant Site Preparation and Table 6-2, Preplant Herbicide Weed Control Ratings, for a list of herbicides and weed control ratings.

Soil Applied Grass and Broadleaf Herbicides (Preemergence Timing Only)

Trade Name	Barn-yard Grass	Smooth Crab- grass	Large Crab- grass	Fall Pani-cum	Giant Foxtail	Green Foxtail	Yellow Foxtail	Witch Grass	Proso Millet
Princep Nine-T, Simadex, Simazine 480 (E)*** (sd,sw,fd)****	9*	8*	8*	7	9*	9*	9*	9*	2

* Indicate the weed is listed on the product label for control or suppression.
***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	Barn-yard Grass	Smooth Crab- grass	Large Crab- grass	Fall Pani-cum	Giant Foxtail	Green Foxtail	Yellow Foxtail	Witch Grass	Proso Millet
Dual II Magnum + Lorox + atrazine** (E)*** (sw)****	9	9	9	8	8	9*	9*	9*	2
Primextra II Magnum + Lorox (E) (fd)	9*	9*	9*	8*	8*	9*	9*	9*	2

* Indicates the weed is listed on the product label for control or suppression.
** - 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	Barn-yard Grass	Smooth Crab- grass	Large Crab- grass	Fall Pani-cum	Giant Foxtail	Green Foxtail	Yellow Foxtail	Old Witch Grass	Proso Millet
atrazine** ***(E) (sd,sw,fd)	2	2	2	2	2	2	2	2	2
Banvel II, Oracle (G) (fd)	0	0	0	0	0	0	0	0	0
Callisto + atrazine (E) (sd,sw,fd)	2	0	4	0	2	2	2	2	2
Marksman or Propero (G) (fd)	2	2	2	2	2	2	2	2	2

** - 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 and Early Postemergence Grass Herbicides

Trade Name	Barn-yard Grass	Smooth Crabgrass	Large Crab- grass	Fall Pani-cum	Giant Foxtail	Green Foxtail	Yellow Foxtail	Old Witch Grass	Proso Millet
Dual II Magnum (E)*** (sd,sw,fd)****	9*	9*	9*	8a*	8*	9*	9*	9*	4
Frontier Max (E) (sd,sw,fd)	9*	9*	9*	8a*	8*	9*	9*	9*	4
Prowl (E) (fd)	9*	9*	9*	9*	8*	8*	8*	–	5

* - Indicates the weed is listed on the product label for control or suppresssion.
^a - Use the high rate of herbicide 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	Barn-yard Grass	Smooth Crabgrass	Large Crab- grass	Fall Pani-cum	Giant Foxtail	Green Foxtail	Yellow Foxtail	Old Witch Grass	Proso Millet
Battalion1 (G)*** (fd)****	9*	8*	8*	9*	8*	8*	8*	9*	9e*
Converge XT1 Converge Flex + atrazine** (G) (fd)	9*	9*	9*	9*	9*	9*	9*	9*	8*
Primextra II Magnum (E) (sd,sw,fd)	9*	9*	9*	8*	8*	9*	9*	9*	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.
^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
¹ - Indicates herbicides sold as a co-pack under this trade name.

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Soil Applied and Early Postemergence Tank-Mixes

Trade Name	Barn-yard Grass	Smooth Crab-grass	Large Crab- grass	Fall Pani-cum	Giant Foxtail	Green Foxtail	Yellow Foxtail	Old Witch Grass	Proso Millet
Dual II Magnum + Banvel II or Oracle (G) (fd)	9*	9*	9*	8a*	8*	8*	8*	9*	2
Dual II Magnum + Callisto + atrazine** (E) (fd)	9*	9*	9*	8a*	8*	8*	8*	9*	4
Dual II Magnum + Marksman or Propero (G) (fd)	9*	9*	9*	8a*	8*	8*	8*	9*	2
Frontier Max + atrazine**(E) (sw)	9*	9*	9*	8*	8*	9*	9*	9*	2
Frontier Max + Banvel II (G) (fd)	9*	9*	9*	8a*	8*	8*	8*	9*	2
Frontier Max + Marksman (E) (fd)	9*	9*	9*	8a*	8*	8*	8*	9*	2
Primextra II Magnum + Banvel II or Oracle (G) (fd)	9*	9*	9*	8a*	8*	8*	8*	9*	2
Primextra II Magnum + Callisto (E) (sd,sw,fd)	9*	9*	9*	8a*	8*	8*	8*	9*	4
Prowl + atrazine**(E) (fd)	9*	8*	8*	9*	8*	8*	8*	7	5
Prowl + Banvel II or Oracle (E) (fd)	9*	8*	8*	9*	8*	8*	8*	–	5
Prowl + Marksman (E) (fd)	9*	8*	8*	9*	8*	8*	8*	8*	5

– 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 1, Herbicides Used in Ontario.
^a - Use the high rate of herbicide for optimum 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	Barn-yard Grass	Smooth Crabgrass	Large Crab- grass	Fall Pani-cum	Giant Foxtail	Green Foxtail	Yellow Foxtail	Witch Grass	Proso Millet
Accent (E) (sd,sw3,fd)	9*	0	7/8	9*	9R*	9R*	8*	9*	9*
Ultim (G) (fd)	9*	0	7/8	9*	9R*	9R*	7*	9*	9*

^R - Indicates populations resistant to this herbicide exist in Ontario and won't be adequately controlled if present.
³ - Use only on selected varieties - see precautions for tolerant varieties on label.
* - 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	Barn-yard Grass	Smooth Crabgrass	Large Crab- grass	Fall Pani-cum	Giant Foxtail	Green Foxtail	Yellow Foxtail	Old Witch Grass	Proso Millet
2,4-D** (F)*** (fd)****	0	0	0	0	0	0	0	0	0
2,4-DB* (Caliber, Cobutox, Embutox) (G) (fd)	0	0	0	0	0	0	0	0	0
atrazine** + oil (G) (sd,sw,fd)	4	4	4	0	4	4	4	4	4
Banvel II, Oracle (G) (fd)	0	0	0	0	0	0	0	0	0
Basagran Forté (E) (sd,sw,fd)	0	0	0	0	0	0	0	0	0
Buctril M, Badge, Logic M, Mextrol (F) (fd)	0	0	0	0	0	0	0	0	0
Callisto + atrazine** (E) (sd,sw,fd)	2	0	4	0	2	2	2	2	2
Distinct (E) (fd)	–	–	–	–	–	–	–	–	–
Impact + atrazine ** (E) (sd, sw)	7*	7*	7*	7	8	7*	7*	7	7
Laddok (E) (sd,sw,fd)	0	0	0	0	0	0	0	0	0
Marksman or Propero (E) (fd)	7	0	0	0	7	7	7	7	0
MCPA** (P) (fd)	0	0	0	0	0	0	0	0	0
Pardner, Koril (E) (sw,sd,fd)	0	0	0	0	0	0	0	0	0
Peakplus1 (E) (fd)	0	0	0	0	0	0	0	0	0
Shotgun (G) (fd)	0	0	0	0	0	0	0	0	0
Tropotox Plus, Clovitox Plus, Topside (G) (fd)	0	0	0	0	0	0	0	0	0

– Insufficient information available to make a rating.
^{** - Various formulations available, see Table 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	Barn-yard Grass	Smooth Crabgrass	Large Crabgrass	Fall Pani-cum	Giant Foxtail	Green Foxtail	Yellow Foxtail	Old Witch Grass	Proso Millet
Accent + Banvel II (G) (fd)	9*	0	7/8	9*	9R*	9R*	8*	9*	9*
Accent + Callisto + atrazine** (E) (fd)	9*	0	7/8	9*	9R*	9R*	8*	9*	9*
Accent + Distinct, Accent Total1 (E) (fd)	9*	0	7/8	9*	9R*	9R*	8*	9*	9*
Accent + Marksman (E) (fd)	9*	0	7/8	9*	9R*	9R*	7*	9*	9*
Accent + Pardner (E) (fd)	9*	0	7/8	9*	9R*	9R*	8*	9*	9*
Accent + Peakplus1, Accent One Pass1 (E) (fd)	9*	0	7/8	9*	9R*	9R*	8*	9*	9*
Accent + Shotgun (G) (fd)	7*	–	–	9*	–	7R*	7*	–	–
atrazine** + Banvel II or Oracle (G) (fd)	4	4	4	0	4	4	4	4	4
atrazine**+ Buctril M, or Badge or Logic M, or Mextrol (F) (fd)	4	4	4	0	4	4	4	4	4
atrazine** + Pardner or Koril (E) (sd,sw,fd)	4	4	4	0	4	4	4	4	4
Banvel II or Oracle + 2,4-D**(F) (fd)	0	0	0	0	0	0	0	0	0
Banvel II + Pardner, Koril or Brotex (G) (fd)	0	0	0	0	0	0	0	0	0
Impact + Frontier Max + atrazine** (E) (fd)	9*	9*	9*	9*	8	9*	9*	9*	–
Option 1.2.3. (E) (fd)	9*	7*	7*	9*	9*	9*	9*	9*	7*
Option + atrazine** (E) (fd)	9*	0	7*	9*	9R*	9R*	7*	9*	9*
Option + Banvel II (G) (fd)	9*	0	7*	9*	9R	9R*	8*	9*	9*
Option + Callisto + atrazine** (E) (fd)	9*	0	7*	9*	9R	9R*	8*	9*	9*
Option + Distinct (G) (fd)	9*	0	7*	9*	9R	9R*	8*	9*	9*
Option + Marksman (E) (fd)	9*	0	7*	9*	9R	9R*	7*	9*	9*
Option + Pardner + atrazine** (E) (fd)	9*	0	7*	9*	9R	9R*	7*	9*	9*
Option + Peakplus1 (E) (fd)	9*	0	7*	9*	9R	9R*	8*	9*	9*
Prowl + Accent + Banvel II or Oracle (G) (fd)	9*	9	9	9*	8	8*	8*	9*	7*
Prowl + Shotgun (G) (fd)	9*	8*	8*	9*	8*	8*	8*	7*	5
Ultim + Banvel II, Oracle (G) (fd)	9*	0	7/8*	9*	9R	9R*	7*	9*	9*
Ultim + Callisto + atrazine** (G) (fd)	9*	0	7/8*	9*	9R	9R*	7*	9*	9*
Ultim + Distinct Ultim Total1 (G) (fd)	9*	0	7/8*	9*	9R	9R*	7*	9*	9*
Ultim + Marksman (G) (fd)	9*	0	7/8*	9*	9R	9R*	7*	9*	9*
Ultim + Pardner (G) (fd)	9*	0	7/8*	9*	9R	9R*	7*	9*	9*
Ultim + Pardner + atrazine** (G) (fd)	9*	0	7/8*	9*	9R	9R*	7*	9*	9*
Ultim + Peakplus1 (G) (fd)	9*	0	7/8*	9*	9R*	9R*	7*	9*	9*
Ultim + Shotgun (G) (fd)	8*	0	7/8*	8*	–	9R*	7*	–	–

* - Indicates the weed is listed on the product label for control or suppresssion.
** - Various formulations available, see Table 1, Herbicides Used in Ontario.
^{– Insufficient information available to make a rating.
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