Southeastern U.S. Vegetable Crop Handbook - 2023 - 340

WEED CONTROL
TABLE 4-9. CHEMICAL WEED CONTROL IN CORN, SWEET (CONT'D)
Weed
Herbicide,
Mode of Action Code*
and Formulation
CORN, SWEET, Postemergence
Grass and broadleaf
weeds
pendimethalin, MOA 3
(Prowl H2
O) 3.8 AS
Amount of
Formulation
Per Acre
Pounds Active
Ingredient
Per Acre
1 to 2
2 to 4 pt
Precautions and Remarks
Apply preemergence before crop germinate or postemergence until sweet
corn is 20 to 24 in. tall or in the V8 growth stage whichever is more restrictive.
Do not apply in reduced, minimum, or no-till sweet corn. Rate is
dependent on organic matter content. See label for additional information.
See label for tank mix options.
Broadleaf and grass
weeds
simazine, MOA 5
(Princep) 4L
1.6 to 2
1.6 to 2 qt
Apply preemergence before weeds and crop emerge. See label for tank
mix options. PHI = 45 days.
Most annual broadleaf
and grass weeds
atrazine, MOA 5
(various brands) 4 L
(various brands) 90 WDG
Annual grasses and
broadleaf weeds
dimethenamid-P, MOA 15
(Outlook) 6.0 EC
+
atrazine, MOA 5
(AAtrex) 4 F or 90 WDG
S-metolachlor, MOA 15
(Dual II Magnum) 7.64 EC
+
atrazine, MOA 5
(AAtrex) 4 F
(AAtrex) 90 WDG
Cocklebur, common
ragweed, jimsonweed,
Pennsylvania
smartweed, velvetleaf,
yellow nutsedge, and
morningglory
bentazon, MOA 6
(Basagran) 4 SL
See labels
1 to 1.67 pt
+
1 to 2 qt
1.3 to 2.2 lb
0.5 to 1
1 to 2 pt
Apply early postemergence overtop when weeds are small, and corn has
one to five leaves. See label for rates according to weed size and special
directions for annual morningglory and yellow nutsedge control. Use a
crop oil at a rate of 1 qt per acre.
Many broadleaf weeds mesotrione, MOA 27
(Callisto) 4 EC
0.094
3 oz
Apply overtop corn 30 in. or less or 8 leaves or less to control emerged
broad- leaf weeds. Use nonionic surfactant at 2 pt per 100-gal of spray
solution. DO NOT add VAN or AMS when making post application in
sweet corn or severe injury will occur. Most effective on small weeds,
however, if weeds are greater than 5 in. or for improved control of certain
weeds, certain atrazine formulations may be mixed with this herbicide.
See label for further information. PHI = 45 days.
Annual broadleaf
weeds and some
grasses
tembotrione, MOA 27
(Laudis) 3.5 L
0.082
3 oz
Can be applied overtop or with drop nozzles to sweet corn from emergence
up to V7 stage. Controls most broadleaf weeds. Does not control
sicklepod or prickly sida and only suppresses morningglory. Controls or
suppresses some grasses. See label for weeds controlled and recommended
size for treatment. Herbicide sensitivity in all hybrids and inbreds
of sweet corn has not been tested. See label for information on adjuvant
use. May be tank mixed with atrazine to increase weed spectrum and
consistency of control. If tank mixed with atrazine, do not apply if corn is
12 in. tall or greater. See label for further restrictions and instructions.
topramezone, MOA 27
(Impact) 2.8 L
0.016
0.75 oz
Can be applied overtop or with drop nozzles to sweet corn from emergence
until 45 days prior to harvest. Does not control sicklepod and only
suppresses morningglory. Controls or suppresses some grasses. See
label for weeds controlled and recommended size for treatment. This
product has not been tested on all inbred line for tolerance. See label for
information on adjuvant use. See label for further restrictions and instructions.
PHI = 45 days.
topramezone, MOA 27
+
dimethenamid-P, MOA 15
(Armezon PRO) 5.26 L
Velvetleaf, spreading
dayflower, morningglory
species, and redroot
pigweed. Will not
control grasses.
fluthiacet-methyl, MOA 14
(Cadet) 0.91 L
14 to 24 oz
0.6 to 0.9 oz
0.0042 to 0.06 Processing sweet corn only. Apply to small weeds, generally about 2 in.
tall. Will control large velvetleaf up to 36 in. See label for information on
adjuvant use. See label for further restrictions and instructions.
*Mode of action (MOA) code developed by the Weed Science Society of America.
340
2023 Vegetable Crop Handbook for Southeastern United States
0.6 to 1
Do not apply to sand textured soils with less than 3% organic matter. PHI
= 50 days.
See labels
0.95 to 1.58
+
1 to 2
Apply overtop corn (5 in. or less) before weeds exceed the two-leaf stage.
Larger weeds will not be controlled. Do not apply within 30 days of sweet
corn ear harvest. Good residual control of annual grass and broadleaf
weeds. Also available as Bicep II or Bicep II Magnum.
2
2 qt
2.2 lb
Atrazine cannot exceed 2.5 lb a.i. per acre per calendar year. Apply
overtop before weeds exceed 1.5 in. in height. See label for additional
information in controlling larger weeds. See label for amount of oil
concentrate to add to spray mix. See label on setback requirements from
streams and lakes.
8 to 21 oz
+
0.375 to 1
+
Apply overtop corn before crop reaches 12 in. tall and before weeds
exceed the two-leaf stage. Larger weeds will not be controlled. Good residual
control of annual grass and broadleaf weeds. Do not apply to corn
12 in. or taller. Also available as the commercial products Guardsman or
LeadOff. PHI = 50 days.
Southeastern U.S. Vegetable Crop Handbook - 2023

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