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Corn Herbicide Grazing, Foraging and Grain Harvest Restrictions

If early harvest of corn is necessary because of drought conditions, a number of corn herbicides restrict the length of time necessary for safe harvest. The following products restrict grazing and/or foraging (silage) following their use in corn. If a corn herbicide product is not listed in the following table, no grazing/feeding restrictions were listed on the product label. For additional information, contact the product manufacturer.
Table 2. Corn herbicide grazing, foraging and grain harvest restrictions.

Corn Herbicide
Graze
(days after treatment)
Silage/grain
Accent  30 30
Aim 0 0
Atrazine 21
21
Banvel or Marksmand
after millk stage
after milk stage
Basagran 12
12
Basis 30
30
Basis Gold
30
30
Beacon/NorthStar 30
45/60
Broadstrike + Dual
85
85
Buctril
30
30
Celebrity
after milk stage
after milk stage
Exceed
30
40/60
Gramoxone Extra
do not graze
do not graze
Hornet
85
85
Laddok
21
21
Liberty
70
60/70
Lightning
45
45
Pinnacle
30
30
Pursuit
45
45
Poast Plus/Poast
60
45/60
Python
no
85
Resource
28
28
Roundup (spot treatment)
14
14
Roundup Ultra*
50*
50/70*
Scorpion III
85
 85
Sencor
60
60
Shotgun
do not graze
–
Stinger
40
40
2,4-D
7
7

 
*Do not graze, ensile, or feed corn if sequential applications of Roundup were applied to Roundup Ready corn hybrids.

Bill Curran and Dwight Lingenfelter
Agronomy Weed Science