Southeastern U.S. Vegetable Crop Handbook - 2021 - 333

WEED CONTROL
TABLE 4-9. CHEMICAL WEED CONTROL IN CORN, SWEET (cont'd)
Weed
Herbicide,
Mode of Action Code* and
Formulation
CORN, SWEET, Postemergence (cont'd)
Cocklebur, passion
flower (maypop),
pigweed, pokeweed,
ragweed, smartweed
(Pennsylvania), velvetleaf
Cocklebur,
pigweed,
lambsquarters, morningglory,
sicklepod,
and many other annual
broadleaf weeds
Annual grasses and
broadleaf weeds
halosulfuron-methyl,
MOA 2
(Profine 75, Sandea) 75
WDG
2,4-D amine, MOA 4
(various brands) 3.8 SL
0.67 oz
0.5 to 1 pt
0.24 to 0.48 Use 0.5 pt of 2, 4-D overtop when corn is 4 to 5 in. tall and weeds are small.
Increase rate to 1 pt as corn reaches 8 in. Use drop nozzles and direct spray
toward base if corn is over 8 in. tall. Do not cultivate for about 10 days after
spraying, as corn may be brittle. Reduce rate of 2, 4-D if extremely hot and soil is
wet. For better sicklepod and horsenettle control, add a nonionic surfactant when
using a directed spray at a rate of 1 qt per 100 gal spray solution. Do not apply
within 45 days of sweet corn ear harvest.
paraquat, MOA 22
(Parazone) 3 SL
(Gramoxone SL) 2 SL
0.7 to 1.3 pt
1 to 2 pt
0.25 to 0.5 DO NOT SPRAY OVER THE TOP OF CORN OR SEVERE INJURY
WILL OCCUR. Make a postdirected application in a minimum of 20 gal spray
mix per acre to emerged weeds when the smallest corn is at least 10 in. tall. Use
nonionic surfactant at a rate of 16 to 32 oz per 100 gal spray mix or 1 gal approved
crop oil concentrate per 100 gal spray mix. Use of a hooded or shielded
sprayer will reduce crop injury. Paraquat product labels require applicators to
take an EPA-approved training every 3 years in order to mix, load, and apply
paraquat.
Certain grasses, including
barnyardgrass,
foxtails, Texas panicum,
and johnsongrass;
and broadleaf
weeds, including bur
cucumber, jimsonweed,
pigweed, pokeweed,
and smartweeds
nicosulfuron, MOA 2
(Accent) 75 WDG
0.031
0.67 oz
Apply to sweet corn up to 12 in. tall or up to and including 5 leaf collars. For corn
12 to 18 in. tall, apply only with drop nozzles. Sweet corn hybrids vary in their
sensitivity to Accent. Do not apply to Merit sweet corn. Contact company representative
for information on other local hybrids that have been evaluated with
Accent. Accent may be applied to corn previously treated with Fortress, Aztec,
or Force, or non-organophosphate soil insecticides regardless of soil type. See
label for more information on use of soil insecticides with Accent. Label prohibits
application of Accent to corn previously treated with Counter insecticide, and
also indicates that applying Accent to corn previously treated with Counter 20 CR,
Lorsban, or Thimet may result in unacceptable crop injury, especially on soils with
less than 4% organic matter. See label for information on use.
nicosulfuron, MOA 2 75
WDG + mesotrione, MOA 27
(Revulin Q) 51.2 WDG
0.031 to 0.036
+
3.44 to 4 oz
0.078 to 0.092
Apply to sweet corn up to 12 in. tall or up to and including 5 leaf collars. For
corn 12 to 18 in. tall, apply only with drop nozzles. Sweet corn hybrids vary in
their sensitivity to Accent. Do not apply to Merit sweet corn. Contact company
representative for information on other local hybrids that have been evaluated
with Accent. Accent may be applied to corn previously treated with Fortress,
Aztec, or Force, or non-organophosphate soil insecticides regardless of soil type.
See label for more information on use of soil insecticides with Accent. Label
prohibits application of Accent to corn previously treated with Counter insecticide,
and also indicates that applying Accent to corn previously treated with Counter
20 CR, Lorsban, or Thimet may result in unacceptable crop injury, especially on
soils with less than 4% organic matter. Postemergence applications of Revulin Q
may cause crop bleaching in some sweet corn hybrids. Crop bleaching is usually
transient. See label for further information.
*Mode of action (MOA) code developed by the Weed Science Society of America.
Amount of
Formulation
Per Acre
Pounds Active
Ingredient
Per Acre
0.032
Precautions and Remarks
Apply over the top or with drop nozzles to sweet corn from spike to lay-by for control
of emerged weeds. Add nonionic surfactant at 1 to 2 qt per 100 gal of spray
solution. See label for all instructions and restrictions. PHI = 30 days.
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