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Herbicide Recommendations for Corn: Postemergence Broadleaf Herbicides and Tank-Mixes (for Broadleaf Weed Control)

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 Broadleaf Herbicides and Tank-Mixes (for Broadleaf Weed Control)

Excerpt from2008 Chapter 9, Publication 75, Guide to Weed Control, Order this publication

Cover of Publication 75, Guide to Weed ControlTable of Contents

  1. 2,4-D
  2. Atrazine 480 + oil
  3. Atrazine + Pardner or Koril
  4. Atrazine 480 + Buctril M or Badge or Logic M or Mextrol
  5. Atrazine 480 + Banvel II or Oracle
  6. Banvel II or Oracle
  7. Banvel II or Oracle + 2,4-D
  8. Basagran Forte + Assist
  9. Buctril M or Badge or Logic M or Mextrol
  10. Caliber, Cobutox or Embutox
  11. Callisto + Aatrex Liquid + non-ionic surfactant
  12. Distinct + non-ionic surfactant + liquid urea ammonium nitrate
  13. Laddok + Assist
  14. Marksman
  15. MCPA Amine
  16. Pardner or Koril
  17. Pardner or Koril + Banvel II or Oracle
  18. Peakplus
  19. Shotgun
  20. Summit + non-ionic surfactant
  21. Tropotox Plus or Clovitox Plus or Topside
  22. Corn Herbicide Weed Control Ratings (Table 9-1) (PDF file - 214kb)
  23. Other Herbicide Recommendations for Corn
  24. Corn Leaf Stages
  25. Related Links
2,4-D
Trade Name
Active Ingredient 2,4-D
Formulation 470 g/L
Rate per hectare (active) 0.28 to 0.56 kg/ha
Rate per hectare (product) 0.6 to 1.2 L/ha
Rate per acre (product) 0.24 to 0.48 L/ac

Precautions

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Atrazine 480 + oil
Trade Name
 + oil
Active Ingredient
atrazine
+ oil
Formulation
480 g/L
 
Rate per hectare (active)
1.01 to 1.49 kg/ha
10 to 17 L/ha 
Rate per hectare (product)
2.1 to 3.1 L/ha
10 to 17 L/ha
Rate per acre (product)
0.84 to 1.24 L/ac
4 to 6.8 L/ac

Precautions

  • For increased activity and extended period of activity, apply in an oil water emulsion of 10 to 17 L/ha (4 to 6.8 L/ac) of emulsifiable light mineral oil and 150-200 L/ha water (60-80 L/ac). Apply when most weeds have emerged. The low rate can be used successfully with later cultivation.

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Atrazine + Pardner or Koril
Trade Name Atrazine + Pardner or + Koril
Active Ingredient
atrazine
+ bromoxynil
or + bromoxynil
Formulation
480 g/L
280 g/L
235 g/L
Rate per hectare (active)
1.01 to 1.49 kg/ha
0.28 kg/ha
0.28 kg/ha
Rate per hectare (product)
2.1 to 3.1 L/ha
1 L/ha
1.2 L/ha
Rate per acre (product)
0.84 to 1.24 L/ac
0.4 L/ac
0.48 L/ac

Precautions

  • Apply from the 4-8 leaf stage of corn. A reduced rate of atrazine at 0.5 kg/ha (1/2 the low rate) can be used to control weeds listed for Pardner (or Koril) alone plus ragweed up to the 8-leaf stage, velvetleaf and triazine susceptible red root pigweed up to 6 leaves.
  • Controls a wider spectrum of broadleaf weeds than Pardner or Koril alone; larger pigweed, ragweed and velvetleaf will be controlled.
  • Do NOT add oil or surfactant.
  • Do NOT use formulated atrazine/oil products in this tank-mixture.
  • KORIL is not registered for use on seed corn.

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Atrazine + Buctril M or Badge or Logic M or Mextrol
Trade Name Atrazine 480 + Buctril M or + Badge or Logic M or Mextrol
Active Ingredient
atrazine
+ bromoxynil/ MCPA
or + bromoxynil/ MCPA
Formulation
480 g/L
560 g/L (1:1)
450 g/L
Rate per hectare (active)
1.1 to 1.49 kg/ha
0.56 kg/ha
0.56 kg/ha
Rate per hectare (product)
2.29 to 3.1 L/ha
1 L/ha
1.25 L/ha
Rate per acre (product)
0.96 to 1.24 L/ac
0.4 L/ac
0.5 L/ac

Precautions

  • Apply from the 4-6 leaf stage of corn but injury may occur if applied after the 6-leaf stage.
  • Controls a wider spectrum of broadleaf weeds than bromoxynil/ MCPA alone; larger velvetleaf will be controlled.
  • Do NOT add oil or surfactant.
  • Do NOT use formulated atrazine/oil products in this tank-mixture.
  • Do NOT use on seed corn or sweet corn.

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Atrazine 480 + Banvel II or Oracle
Trade Name
Active Ingredient
atrazine
+ dicamba
Formulation
480 g/L
480 g/L
Rate per hectare (active)
1.01 to 1.49 kg/ha
0.288 kg/ha
Rate per hectare (product)
2.1 to 3.1 L/ha
0.6 L/ha
Rate per acre (product)
0.84 to 1.24 L/ac
0.24 L/ac

Precautions

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Banvel II or Oracle
Trade Name
Active Ingredient dicamba
Formulation 480 g/L
Rate per hectare (active) 0.288 to 0.6 kg/ha
Rate per hectare (product) 0.6 to 1.25 L/ha
Rate per acre (product) 0.24 to 0.5 L/ac

Precautions

  • Application of the lower rate can be made up to 20 cm standing corn. Use drop pipes when corn is 20-50 cm tall. The 0.6 kg/ha rate commonly referred to as the overlay treatment is particularly effective in controlling velvetleaf and providing extended residual control of other late germinating deep rooted broadleaf annuals and can be applied from the spike stage to the 5-leaf stage (13 cm standing corn).
  • See special notes on postemergence use of dicamba and related hormone chemicals.
  • Do NOT use dicamba if temperature exceeds 25°C at the time of application, or if high humidity is expected, due to the possibility of dicamba volatilizing and injury to susceptible crops nearby.
  • Do NOT add oil or surfactant.
  • Do NOT use on seed corn or sweet corn.

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Banvel II or Oracle + 2,4-D
Trade Name Banvel II or Oracle + 2,4-D
Active Ingredient
dicamba
+ 2,4-D
Formulation
480 g/L
470 g/L
Rate per hectare (active)
0.14 kg/ha
0.4 kg/ha
Rate per hectare (product)
0.29 L/ha
0.85 L/ha
Rate per acre (product)
0.12 L/ac
0.34 L/ac

Precautions

  • Application can be made up to 10 cm standing corn. Use drop pipes when corn is 10-50 cm tall. Use amine formulation of 2,4-D.
  • See special notes on postemergence use of dicamba and 2,4-D and related hormone chemicals.
  • Do NOT add oil or surfactant.
  • Do NOT use on seed corn or sweet corn.

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Basagran Forté or Basagran + Assist
Trade Name Basagran + Assist
Active Ingredient
bentazon
+ oil concentrate
Formulation
480 g/L
  
Rate per hectare (active)
0.84 to 1.08 kg/ha
2 L/ha 
Rate per hectare (product)
1.75 to 2.25 L/ha
Rate per acre (product)
0.7 to 0.9 L/ac
 

Precautions

  • Top growth of nutsedge and Canada thistle are controlled and field bindweed may be suppressed by 2 applications of 1.75 L/ha (0.7 L/ac) (0.84 kg active/ha) applied 10 days apart.
  • Cool weather or drought may delay control.

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Buctril M or Badge or Logic M or Mextrol
Trade Name Buctril M or Badge or Logic M or Mextrol
Active Ingredient
bromoxynil/ MCPA
or bromoxynil/ MCPA
Formulation
560 g/L (1:1)
450 g/L
Rate per hectare (active)
0.558 kg/ha
0.558 kg/ha
Rate per hectare (product)
1 L/ha
1.25 L/ha
Rate per acre (product)
0.4 L/ac
0.5 L/ac

Precautions

  • Apply from the 4-6 leaf stage of corn but injury may occur if applied after the 6-leaf stage.
  • Controls most annual broadleaf weeds up to the 4-leaf stage (lamb's-quarters and mustards to 8-leaf stage).
  • Use in preference to Pardner or Koril when wild mustard is a particular problem.
  • Do NOT use on seed corn or sweet corn.

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Embutox, Caliber or Cobutox 625
Trade Name
Active Ingredient 2,4-DB
Formulation 625 g/L
Rate per hectare (active) 1.1 to 1.5 kg/ha
Rate per hectare (product) 1.75 to 2.25 L/ha
Rate per acre (product) 0.7 to 0.9 L/ac

Precautions

  • See special notes on postemergence use of 2,4-DB and related hormone chemicals.
  • Note: The maximum label rate for Embutox 625 is 2.25 L/ha (0.9 L/ac) of product.
  • Do NOT add oil or surfactant.
  • Do NOT use on seed corn or sweet corn.

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Callisto + Aatrex Liquid + non-ionic surfactant
Trade Name Callisto + Aatrex Liquid + non-ionic surfactant
Active Ingredient
mesotrione
+ atrazine
+ non-ionic surfactant
Formulation
480 g/L
470 g/L
  
Rate per hectare (active)
0.1 kg/ha
0.28 kg/ha
0.2% v/v
Rate per hectare (product)
0.21 L/ha
0.58 L/ha
2 L/1000 L
Rate per acre (product)
0.085 L/ac
0.235 L/ac
2 L/1000 L

Precautions

  • Apply from the 3 to 8 leaf stage of corn.
  • Do NOT use on seed or sweet corn.
  • Apply in 100 - 200 L/ha of water.
  • Do NOT apply to corn treated with an organophosphorous insecticide.

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Distinct + non-ionic surfactant + liquid urea ammonium nitrate
Trade Name Distinct + non-ionic surfactant + liquid urea ammonium nitrate
Active Ingredient
diflufenzopyr/ dicamba
+ non-ionic surfactant
+ liquid urea ammonium nitrate
Formulation
70 WG
 
 
Rate per hectare (active)
0.2 kg/ha
0.25% v/v
1.25% v/v
Rate per hectare (product)
0.285 kg/ha
2.5 L/1000 L
12.5 L/1000 L
Rate per acre (product)
0.115 kg/ac
2.5 L/1000 L
12.5 L/1000 L

Precautions

  • Apply to actively growing weeds when corn is in the 2-6 leaf stage.
  • Apply when temperatures above 4°C are predicted for the 24 hours before and after application.
  • Do NOT use on seed corn or sweet corn.

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Laddok + Assist
Trade Name Laddok + Assist
Active Ingredient
bentazon/atrazine
+ oil concentrate
Formulation
400 g/L (1:1)
 
Rate per hectare (active)
0.8 to 1.6 kg/ha
2 L/ha
Rate per hectare (product)
2 to 4 L/ac
2 L/ha
Rate per acre (product)
0.8 to 1.6 L/ac
0.8 L/ac

Precautions

  • The recommended rate of 1.2 to 1.6 kg/ha of Laddok (3 to 4 L/ha (1.2 to 1.6 L/ac) Laddok may be reduced to 0.8 to 1 kg/ha (2 to 2.5 L/ha (0.8 to 1 L/ac)) if Frontier or Dual II Magnum has been applied at the recommended rate for preemergence grass control. Use Laddok at 3 to 4 L/ha (1.2 to 1.6 L/ac) for nutsedge control; repeat 7-10 days if necessary.

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Marksman
Trade Name
Active Ingredient dicamba/atrazine
Formulation 401 g/L (1:2)
Rate per hectare (active) 1.48 to 1.8 kg/ha
Rate per hectare (product) 3.7 to 4.5 L/ha
Rate per acre (product) 1.5 to 1.8 L/ac

Precautions

  • Application can be made up to 13 cm standing corn (5-leaf). Use the lower rate on coarse textured soils and the higher rate on medium to fine textured soils.
  • See special notes on postemergence use of dicamba and related hormone chemicals.
  • Do NOT use on seed corn or sweet corn.

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MCPA Amine
Trade Name
Active Ingredient MCPA
Formulation 500 g/L
Rate per hectare (active) 0.38 to 0.63 kg/ha
Rate per hectare (product) 0.76 to 1.26 L/ha
Rate per acre (product) 0.3 to 0.5 L/ac

Precautions

  • Treat before the corn reaches 15 cm tall (leaf extended).
  • Use the lower rate for small, actively growing weeds and the higher rate for larger weeds or under adverse weather conditions.
  • Top growth control of fully developed horsetail (15-25 cm) can be achieved with 1 L/ha (0.4 L/ac) of product.
  • Do NOT use on seed corn or sweet corn.

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Pardner or Koril
Trade Name Pardner or Koril
Active Ingredient
bromoxynil
or bromoxynil
Formulation
280 g/L
235 g/L
Rate per hectare (active)
0.28 to 0.34 kg/ha
0.28 to 0.34 kg/ha
Rate per hectare (product)
1 to 1.2 L/ha
1.2 to 1.4 L/ha
Rate per acre (product)
0.4 to 0.48 L/ac
0.48 to 0.56 L/ac

Precautions

  • Controls most annual broadleaf weeds, including triazine resistant species at the 1-4 leaf stage.
  • Pardner and Koril are contact herbicides and are non volatile.
  • Koril is not registered for use on seed corn.

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Pardner or Koril + Banvel II or Oracle
Trade Name Pardner or Koril + Banvel II or Oracle
Active Ingredient
bromoxynil
or bromoxynil
+ dicamba
Formulation
280 g/L
235 g/L
480 g/L
Rate per hectare (active)
0.28 kg/ha
0.28 kg/ha
0.144 kg/ha
Rate per hectare (product)
1 L/ha
1.2 L/ha
0.3 L/ha
Rate per acre (product)
0.4 L/ac
0.48 L/ac
0.12 L/ac

Precautions

  • Apply when the corn is in the 4-6 leaf stage as an overall treatment and up to 50 cm standing corn, using drop pipes.
  • Controls most annual broadleaf weeds including triazine resistant lamb's-quarters, pigweed and ragweed up to the 6-leaf stage.
  • See special notes on postemergence use of dicamba and precautions for Banvel II or Oracle alone POST.
  • Do NOT use on seed corn or sweet corn.

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Peakplus1
Trade Name Peakplus1 (Peak + Banvel II) + non-ionic surfactant
Active Ingredient
prosulfuron + dicamba
+ non-ionic surfactant
Formulation
75 WG + 480 g/L
 
Rate per hectare (active)
10 g/ha + 0.14 kg/ha
0.2% v/v
Rate per hectare (product)
13.3 g/ha + 0.3 L/ha
2 L/1000 L
Rate per acre (product)
5.3 g/ac + 0.12 L/ac
2 L/1000 L

Precautions

  • Apply when the corn is in the 2-7 leaf stage.
  • Controls most annual broadleaf weeds including triazine resistant lamb's-quarters and pigweed up to the 6-leaf stage; cocklebur and velvetleaf up to the 6-leaf stage; and ragweed up to the 8-leaf stage.
  • Do NOT apply to corn treated with organophosphorus insecticides.
  • Do NOT apply to popcorn or sweet corn.
  • Peakplus1 is a co-pack of Peak 75WG and Banvel II.

1 - Indicates herbicides sold as co-pack under this name.

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Shotgun
Trade Name
Active Ingredient atrazine/2,4-D
Formulation 390 g/L (2.3:1)
Rate per hectare (active) 0.936 to 1.404 kg/ha
Rate per hectare (product) 2.4 to 3.59 L/ha
Rate per acre (product) 0.9 6 to 1.44 L/ac

Precautions

  • Apply as an overall spray from the spike to the 4-leaf stage of corn.
  • Do NOT add oil or surfactant.
  • Do NOT use on seed corn or sweet corn.

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Summit + non-ionic surfactant
Trade Name Summit + non-ionic surfactant
Active Ingredient
primisulfuron-methyl/dicamba
+ non-ionic surfactant
Formulation
47.4 WG
 
Rate per hectare (active)
0.166 kg/ha
0.2% v/v
Rate per hectare (product)
0.35 kg/ha
2 L/1000 L
Rate per acre (product)
0.14 kg/ac
2 L/1000 L

Precautions

  • Corn should be within the 2-7 leaf stage.
  • Apply when the quackgrass is within the 3-6 leaf stage.
  • Controls quackgrass and most annual broadleaf weeds. Does not provide control of annual grasses.
  • Apply when temperature, during the 24 hours before and after application, ranges between 5°C and 28°C.
  • Do NOT use on seed corn or sweet corn.
  • Do NOT apply to corn treated with an organophosphate insecticide.

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Tropotox Plus, Clovitox Plus or Topside
Trade Name Tropotox Plus or Clovitox Plus or Topside
Active Ingredient
MCPB/MCPA
or MCPB/MCPA
or MCPB/MCPA
Formulation
400 g/L
400 g/L
400 g/L
Rate per hectare (active)
1.1 to 1.7 kg/ha
1.1 to 1.7 kg/ha
1.1 to 1.7 kg/ha
Rate per hectare (product)
2.75 to 4.25 L/ha
2.75 to 4.25 L/ha
2.75 to 4.25 L/ha
Rate per acre (product)
1.1 to 1.7 L/ac
1.1 to 1.7 L/ac
1.1 to 1.7 L/ac

Precautions

  • Apply when corn is 30-60 cm high, using drop pipes. Some control of field horsetail may be obtained with the higher rates of MCPB/MCPA.
  • See special notes on postemergence use of MCPB/MCPA and related hormone chemicals.
  • Do NOT add oil or surfactant.
  • Do NOT use on seed corn or sweet corn.

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Related Links

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