Skip to Content

Post-emergence Herbicide Use for Field Corn

Now that corn is beginning to emerge in our area it is important to keep on top of the weeds that will begin to compete with the growing corn. Below is a table  that shows the application timing of different herbicides used in field corn.

Corn

LABELED TIMES OF APPLICATION AND PRE-HARVEST INTERVALS (PHI)

Herbicide

 

Field Corn Stage of Growth PHI (DAYS) Grazing, Feed, Forage, Hay, Silage Interval (days)

Earliest

 

Latest

 

Aim

spike

V8


V8-14 leaf collars – drops

14 leaf collars

14

Atrazine

PPI/PRE

12″

grazing = 21forage = 60

Basagran

1-2 leaf

NL

12

Callisto

PRE

30″ tall or 8 leaf stage

45

45

Capreno

V1

V6


V6-V7- drops

45

Clarity

1-2 leaf

5th leaf or 8″ tall8-36″ tall drops Milk stage or later
Dual Magnum

PPI/PRE

40″ tall

30

ET

Spike

V4


V4-V8 – drops

90

50

Halex GT

Spike

30″ or V8

45

45

Impact/Armezon

spike

V8

45

45

Laudis

1-2 leaf

V8

45

Liberty

spike

24″ or V7


24-36″ – drops

70

60

Prowl H

20

spike

30″ or V8

21

Realm Q

1-2 leaf

20″ or V7

70

45

Roundup

(glyphosate)

spike

RR2 Hybrids

30″ or V8


30-48″ – drops

RR1 Hybrids

30″ or V8

50

50

Sandea

spike

layby

30

Status

V2

5th leaf or 8″


8-36″ or V10 – drops

72

32

Steadfast Q

1-2 leaf

20″ or V6

30

Warrant

spike

24″


24-30″ – drops

40

Zidua

PPI/PRE

V4

NL = none specifically listed on the label.

For more information please contact you local extension agent.