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Herbicide Recommendations for Corn: Directed Postemergence

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

Pub 75: Guide to Weed Control > Corn > Herbicide Recommendations for Corn: Directed Postemergence

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. Lorox L
  2. MCPA Amine
  3. Ultim + Pardner or Koril + non-ionic surfactant
  4. Ultim + non-ionic surfactant
  5. Corn Herbicide Weed Control Ratings (Table 9-1) (PDF file - 214kb)
  6. Other Herbicide Recommendations for Corn
  7. Corn Leaf Stages
  8. Related Links
Lorox L
Trade Name
Active Ingredient linuron
Formulation 480 g/L
Rate per hectare (active) 1.1 to 2.25 kg/ha
Rate per hectare (product) 2.4 to 4.5 L/ha
Rate per acre (product) 0.96 to 1.8 L/ac

Precautions

  • Apply in oil water emulsion as directed spray at low pressure with drop nozzles after corn is 30 cm or more in height.
  • The spray must be placed under the corn leaves but on the weeds. Use this treatment as a rescue from weeds escaping a previous treatment and for nutsedge or horsetail top growth burn down.
  • Do NOT apply linuron after corn is beginning to tassel.

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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

  • Controls triazine resistant and most other broadleaf weeds.
  • Use the lower rate for small, actively growing weeds and the higher rate for larger weeds or under adverse weather conditions. Top growth of fully developed horsetail (15-25 cm) can be controlled with 1 L/ha (0.4 L/ac) of product; a directed late post application using drop nozzles to avoid corn injury is necessary.
  • Do NOT use on seed corn or sweet corn.

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Ultim + Pardner or Koril + non-ionic surfactant
Trade Name
+ non-ionic surfactant
Active Ingredient
nicosulfuron/ rimsulfuron
+ bromoxynil
+ bromoxynil
+ non-ionic surfactant
Formulation
75 DF (1:1)
280 g/L
235 g/L
 
Rate per hectare (active)
25 g/ha
0.28 kg/ha
0.28 kg/ha
0.2% v/v
Rate per hectare (product)
33 g/ha
1 L/ha
1.2 L/ha
2 L/1000 L
Rate per acre (product)
13 g/ac
0.4 L/ac
0.5 L/ac
2 L/1000 L

Precautions

  • Delay application until 8-leaf stage of corn, when a height differential can be established between the corn and target weeds. Application should be made before the initiation of corn silking. Direct spray solution below crop canopy. Apply one water soluble bag/ha of Ultim.
  • Provides later season quackgrass control.
  • Do NOT use on seed corn or sweet corn.

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Ultim + non-ionic surfactant
Trade Name Ultim + non-ionic surfactant
Active Ingredient
nicosulfuron/rimsulfuron
+ non-ionic surfactant
Formulation
75 DF (1:1)
 
Rate per hectare (active)
25 g/ha
0.2% v/v
Rate per hectare (product)
33 g/ha
2 L/1000 L
Rate per acre (product)
13 g/ac
2 L/1000 L

Precautions

  • Delay application until 8-leaf stage of corn, when a height differential can be established between the corn and target weeds. Application should be made before the initiation of silking. Direct spray solution below crop canopy. Apply one water soluble bag/ha of Ultim.
  • Provides later season quackgrass control.
  • Do NOT use on seed corn or sweet corn.

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Related Links

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