Southeastern U.S. Vegetable Crop Handbook - 2023 - 351

WEED CONTROL
TABLE 4-16. CHEMICAL WEED CONTROL IN OKRA
Weed
Herbicide,
Mode of Action Code*
and Formulation
OKRA, Preplant and Preemergence
Annual and perennial
grass and broadleaf
weeds, stale bed
application
Most broadleaf weeds
less than 4 in. tall or
rosettes less than 3 in.
in diameter; does not
control grasses
Emerged broadleaf
weeds and some
annual grasses
glyphosate, MOA 9
(numerous brands and
formulations)
carfentrazone-ethyl,
MOA 14
(Aim) 1.9 EW or 2 EC
caprylic acid, MOA 26
(Homeplate)
Up to 2 oz
Amount of
Formulation
Per Acre
See labels
Pounds Active
Ingredient
Per Acre
Precautions and Remarks
See labels
Apply to emerged weeds before crop emergence. Perennial weeds may
require higher rates. Consult the manufacturer's label for rates for specific
weeds. Certain glyphosate formulations require the addition of surfactant.
Adding nonionic surfactant to glyphosate formulated with nonionic surfactant
may result in reduced weed control.
Up to 0.031 Apply no later than 1 day before transplanting crop. Use a nonionic
surfactant or crop oil with Aim. See label for rate. Coverage is essential
for good weed control. Can be tank mixed with other registered burndown
herbicides.
See label
See label
May be applied prior to planting as a burndown treatment for emerged
weeds, as a preemergence application after seeding but before emergence,
as a directed or shielded application between rows or as a postharvest
application. Use higher spray volumes for high weed density and weeds
larger than 5 in. Coverage is important for acceptable weed control. May be
tank mixed with other herbicides. See label for further instructions.
Annual grasses and
small-seeded broadleaf
weeds
Broadleaf and grass
weeds
trifluralin, MOA 3
(Treflan, Treflan HFP,
Trifluralin) 4 EC
prometryn, MOA 5
(Caparol) 4L
0.5 to 1
1 to 2 pt
1 to 2
1.5 to 3 pt
Apply preemergence and or post-directed application. Make a single
preemergence application of Caparol at 3 pt per acre after planting and
before crop emergence or a sequential application (see label for further
details). Do not exceed 3 pt per acre of Caparol per season. See label for
crop rotation restrictions. PH = 14 days.
Annual broadleaf
weeds including pigweed
spp.
mesotrione, MOA 27
(Callisto) 4 L
0.19
6 oz
May be applied as a row middle or hooded POST-directed application but
not both. For preemergence row middle application, apply as a banded
application to the row middles prior to weed emergence. Leave 1 ft. of
untreated area over the okra row or 6 in. on each side of the planted row.
Do not apply Callisto directly over the planted row or severe injury may
occur. Injury risk is greatest on coarse textured soils (sand, sandy loam, or
loamy sand).
OKRA, Postemergence
Annual and perennial
grasses
Most broadleaf weeds
less than 4 in. tall or
rosettes less than 3 in.
in diameter; does not
control grasses
Annual and perennial
grass and broadleaf
weeds
Annual broadleaf
weeds including pigweed
3 in or less
Yellow and purple nutsedge
and broadleaf
weeds
sethoxydim, MOA 1
(Poast) 1.5 EC
carfentrazone-ethyl,
MOA 14
(Aim) 1.9 EW or 2 EC
glyphosate, MOA 9
(numerous brands and
formulations)
mesotrione, MOA 27
(Callisto) 4 L
halosulfuron-methyl,
MOA 2
(Sandea) 75 DG
0.5 to 1 oz
Up to 2 oz
See labels
0.2 to 0.3
1 to 1.5 pt
Apply to actively growing grasses not under drought stress. Do not apply on
days that are unusually hot and humid. PHI = 14 days.
Up to 0.031 Emerged broadleaf weeds. Apply to row middles only with a hooded
sprayer. Use crop oil concentrate or nonionic surfactant at recommended
rates. PHI = 5 days.
See labels
Row middles only. Apply as a hooded spray in row middles, as shielded
spray in row middles, as wiper applications in row middles, or postharvest.
To avoid severe injury to crop, do not allow herbicide to contact foliage,
green shoots or stems, exposed roots, or fruit of crop. PHI = 14 days.
See label
See label
May be applied as a row middle or hooded POST-directed application but
not both. For postemergence hooded application, okra must be at least 3 in.
tall. Minimize amount of Callisto that contacts okra foliage or crop injury will
occur. PHI = 28 days.
0.024 to 0.048 Apply to row middles as a postemergence shielded or hooded spray to
avoid contact of herbicide with planted crop. In plasticulture, do not allow
spray to contact plastic. Do not apply more than 2 oz per acre per 12-month
period. PHI = 30 days.
*Mode of action (MOA) code developed by the Weed Science Society of America.
Apply preplant and incorporate into the soil 2 to 3 in. within 8 hours using a
rototiller or tandem disk.
2023 Vegetable Crop Handbook for Southeastern United States
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