Late-season herbicide applications in corn

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Some questions have recently come in looking for herbicide options for corn in later vegetative stages. Adequate pre-emergence herbicides were applied; however, excessive rainfall and sandy soils resulted in weed emergence. While early-season weed control is critical to protect yield potential, in some situations, late-season weed control may be needed to protect yield, prevent harvest difficulties, and reduce additions to the weed seed bank.

Table 1 lists products that can be applied to corn over 12 inches tall to control emerged weeds. Note that some of these products recommend or require drop nozzles to reduce crop injury and get better spray coverage on weeds that are shorter than the crop. Also of note, strategies for more successful herbicide applications in high temperatures were discussed in an eUpdate article published on June 13.

 

Table 1. Herbicides labeled for corn over 12 inches tall to control emerged weeds.

Herbicide
(group)

Product

Maximum
corn height

Comments

Glufosinate

Liberty, others

V6

 

Tolpyralate

Shieldex

V6 or 20 inches

Can mix with Tough to enhance control

Clopyralid

Stinger, others

24 inches

Fair to good pigweed control

Topramezone

Armezon, Impact

V8

Can mix with Tough to enhance control

Pyridate (6)

Tough

V8

Can be used to enhance Group 27 herbicides

Mesotrione (27)

Callisto, others

V8 or 30 inches

Can mix with Tough to enhance control

Glyphosate

Many

V8 or 30 inches

RR2 hybrids use drop nozzles 30 to 48 inches

Nicosulfuron (2)

Accent

36 inches

Use drop nozzles >20 inches

Tembotrione (27)

Laudis

V9

Can mix with Tough to enhance control

Carfentrazone (14)

Aim

14 leaves

Use drop nozzles > 8 leaves

Bromoxynil

Moxy, others

tasselling

Fair pigweed control

Dicamba

Clarity others

tasselling

 Fair to good crop safety

DiFlexx

V10

Good crop safety

Status

V8 or 30 inches

Good to excellent crop safety

2,4-D (4)

 

Amine or ester

tasselling

Use drop nozzles if corn >8 inches

Enlist One

V8 or 30 inches

 

 

For more detailed information, see the “2024 Chemical Weed Control for Field Crops, Pastures, and Noncropland” guide available online at https://www.bookstore.ksre.ksu.edu/pubs/CHEMWEEDGUIDE.pdf or check with your local K-State Research and Extension office for a paper copy.


The use of trade names is for clarity to readers and does not imply endorsement of a particular product, nor does exclusion imply non-approval. Always consult the herbicide label for the most current use requirements. Users should read and follow all label directions.

 

 

Sarah Lancaster, Weed Science Extension Specialist
slancaster@ksu.edu


Tags:  corn weed control post-emergence late-season 

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