Southeastern U.S. Vegetable Crop Handbook - 2021 - 334

WEED CONTROL
TABLE 4-10. CHEMICAL WEED CONTROL IN CUCUMBER (cont'd)
Weed
Herbicide,
Mode of Action Code* and
Formulation
CUCUMBERS, Preplant antd Preemergence
Suppression or control
of most annual grasses
and broadleaf weeds,
full rate required for
nutsedge control
Emerged broadleaf and
grass weeds
Broadleaf weeds and
some annual grasses
metam sodium
(Vapam HL) 42%
37.5 to 75
gal
15.7 to 31.5 Rates are dependent on soil type and weeds present. Apply when soil moisture is
at field capacity (100 to 125%).Apply through soil injection using a rotary tiller or inject
with knives no more than 4 in. apart; follow immediately with a roller to smooth
and compact the soil surface or with mulch. May apply through drip irrigation prior
to planting a second crop on mulch. Plant back interval is often 14 to 21 days and
can be 30 days in some environments. See label for all restrictions and additional
information.
pelargonic acid, MOA 26
(Scythe) 4.2 EC
caprylic acid, MOA 26
(Homeplate)
See label
See label
See label
See label
Apply before crop emergence and control emerged weeds. There is no residual
activity. May be tank mixed with soil residual compounds. See label for further
instructions. May also be used as a banded spray between row middles. Use
shielded sprayer directed to the row middles to reduce drift to the crop.
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.
Most broadleaf weeds
less than 4 in. tall or
rosettes less than 3 in.
in diameter, does not
control grasses.
Contact kill of all green
foliage, stale bed
application
carfentrazone-ethyl,
MOA14
(Aim) 1.9 EW or 2 EC
Up to 2 oz
Up to 0.031 Aim 1.9 EW is registered for application in transplant production systems only. Aim
2 EC is registered in seeded and transplant production systems. Apply no later than
one day before transplanting or no later than 7 days before seeding crop. See label
for information about application timing. Use a crop oil at up to 1 gal per 100 gal of
spray solution or a nonionic surfactant at 2 pt per 100 gal of spray solution. Coverage
is essential for good weed control. Can be tank mixed with other registered
burndown herbicides.
paraquat, MOA 22
(Parazone) 3 SL
(Gramoxone SL) 2 SL
0.5 to 1
1.3 to 2.7 pt
2 to 4 pt
Apply in a minimum of 10 gal spray mix per acre to emerged weeds before crop
emergence as a broadcast or band treatment over a preformed row. Use sufficient
water to give thorough coverage. Row should be formed several days ahead of
planting and treating to allow maximum weed emergence. Use a 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. Paraquat product labels require applicators to take
an EPA-approved training every 3 years in order to mix, load, and apply paraquat.
Annual and perennial
grass and broadleaf
weeds, stale bed
application
glyphosate, MOA 9
(numerous brands and
formulations)
See labels
See labels
Apply to emerged weeds at least 3 days before seeding or transplanting. Perennial
weeds may require higher rates of glyphosate. Consult the manufacturer's label for
rates for specific weeds. When applying Roundup before transplanting crops into
plastic mulch, care must be taken to remove residues of this product from the plastic
prior to transplanting. To prevent crop injury, residues can be removed by 0.5 in.
rainfall or by applying water via a sprinkler system. Certain glyphosate formulations
require the addition of surfactant. Adding nonionic surfactant to glyphosate formulated
with nonionic surfactant may result in reduced weed control.
Annual grasses and
small-seeded broadleaf
weeds
Annual grasses and
some small-seeded
broadleaf weeds; weak
on pigweed
Annual grasses and
some small-seeded
broadleaf weeds
bensulide, MOA 8
(Prefar) 4 EC
5 to 6
5 to 6 qt
Registered for cucurbit vegetable group (Crop grouping 9) .Apply preplant and
incorporate into the soil 1 to 2 in. (1 in. incorporation is optimum) with a rototiller
or tandem disk, or apply to the soil surface after seeding and follow with irrigation
within 36 hours after application. Check replant restrictions for small grains on
label.
clomazone, MOA 13
(Command) 3 ME
ethalfluralin, MOA 3
(Curbit) 3 EC
0.15 to 0.375 Apply immediately after seeding. See label for further information.
0.4 to 1 pt
1.1 to 1.7
3 to 4.5 pt
Apply post plant to seeded crop prior to crop emergence, or as a banded spray
between rows after crop emergence or transplanting. See label for timing. Shallow
cultivation, irrigation, or rainfall within 5 days is needed for good weed control. Do
not use under mulches, row covers, or hot caps. Under conditions of unusually cold
or wet soil and air temperatures, crop stunting or injury may occur. Crop injury can
occur if seeding depth is too shallow.
Annual grasses and
broadleaf weeds
Yellow and purple nutsedge
and broadleaf
weeds
ethalfluralin, MOA 3
+ clomazone, MOA 13
(Strategy) 2.1 L
2 to 6 pt
halosulfuron-methyl, MOA2
(Profine 75, Sandea) 75 DG 0.5 to 0.75
oz
0.4 to 1.2
+
0.125 to 0.375
Apply to the soil surface immediately after crop seeding for preemergence control
of weeds. DO NOT APPLY PRIOR TO PLANTING CROP. DO NOT SOIL INCORPORATE.
May also be used as a banded treatment between rows after crop
emergence or transplanting. Do not apply over or under plastic mulch.
0.024 to 0.036 Apply after seeding or prior to transplanting crop. For transplanting, do not transplant
until 7 days after application. For seeded or transplanting cucumbers in plasticulture,
do not plant within 7 days of Sandea application. Rate can be increased to
1 ounce of product per acre to middles between rows. PHI = 21 days.
Amount of
Formulation
Per Acre
Pounds Active
Ingredient
Per Acre
Precautions and Remarks
334
2021 Vegetable Crop Handbook for Southeastern United States

Southeastern U.S. Vegetable Crop Handbook - 2021

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