Southeastern U.S. Vegetable Crop Handbook - 2023 - 368

WEED CONTROL
TABLE 4-26. CHEMICAL WEED CONTROL IN TOMATOES (CONT'D)
Weed
Herbicide,
Mode of Action Code*
and Formulation
TOMATO, Preplant
Suppression or
control of most annual
grasses and broadleaf
weeds (full rate
required for nutsedge
control)
metam sodium
(Vapam HL) 42%
Amount of
Formulation
Per Acre
Pounds Active
Ingredient
Per Acre
Precautions and Remarks
37.5 to 75 gal
15.7 to 31.5 Rates are dependent on soil type and weeds present. For nutsedge,
use 75-gal per acre. 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; however, adhere
to label guidelines on crop plant back interval. 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. Chloropicrin (150 lb per acre
broadcast) will also be needed when laying first crop mulch to control
nutsedge.
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,
MOA 14
(Aim) 1.9 EW or 2 EC
paraquat, MOA 22
(Parazone) 3SL
(Gramoxone SL) 2 SL
Up to 2 oz
0.5 to 1
1.3 to 2.7 pt
2 to 4 pt
Up to 0.031 Transplanted crop. Apply no later than 1 day before transplanting.
Seeded crop (Aim 2 EC only). Apply no later than 7 days before
planting seeded 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.
Apply to emerged weeds in a minimum of 20-gal spray mix per acre
before crop emergence as a broadcast or band treatment over a preformed
row. 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 to mix, load,
and apply paraquat.
Broadleaf weeds and
some annual grasses
caprylic acid, MOA 26
(Homeplate)
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.
Broadleaf weeds
including Carolina
geranium and cutleaf
eveningprimrose and a
few annual grasses
Annual grasses and
small-seeded broadleaf
weeds including
common lambsquarters,
pigweed, carpetweed,
and common
purslane
oxyfluorfen, MOA 14
(Goal) 2 XL
0.5
Up to 2 pt
Plasticulture only. Apply to soil surface of pre-formed beds at least 30
days prior to transplanting crop. While incorporation is not necessary, it
may result in less crop injury. Plastic mulch can be applied any time after
application, but best results are likely if applied soon after application.
napropamide, MOA 15
(Devrinol, Devrinol
DF-XT) 50 DF
(Devrinol, Devrinol 2-XT)
2 EC
1 to 2
2 to 4 lb
2 to 4 qt
Bareground: Apply preplant and incorporate into the soil 1 to 2 in. as
soon as possible with a rototiller or tandem disk. Can be used on direct-seeded
or transplanted tomatoes. See label for instructions on use.
Plasticulture: Apply to a weed-free soil before laying plastic mulch. Soil
should be well worked yet moist enough to permit a thorough incorporation
to a depth of 2 in. Mechanically incorporate or irrigate within 24
hours after application. If weed pressure is from small-seeded annuals,
apply to the surface of the bed immediately in front of the laying of
plastic mulch. If soil is dry, water or sprinkle irrigate with sufficient water
to wet to a depth of 2 to 4 in. before covering with plastic mulch.
Between rows: Apply to a weed free soil surface between the rows
(bareground or plastic mulch). Mechanically incorporate or irrigate Devrinol
into the soil to a depth of 1 to 2 in. within 24 hours of application. See
XT labels for information regarding delay in irrigation event.
pendimethalin, MOA 3
(Prowl H2
O) 3.8 AS
0.5 to 1.5
1 to 3 pt
Plasticulture In-row. May be applied as a preplant surface application
or a preplant incorporated application prior to transplanting tomato.
Bareground In-row. May be applied as a broadcast preplant surface
application or preplant incorporated application prior to transplanting
tomato.
Post-directed spray. May be applied as a post-directed spray on the
soil at the base of the plant, beneath plants, and between rows. Avoid
direct contact with tomato foliage or stems. Do not apply over the top of
tomato. PHI=21 days. Do not apply more than 3 pt per acre per season.
See label for specific use rate for your soil type. Emerged weeds will not
be controlled. See label for further instructions and precautions.
*Mode of action (MOA) code developed by the Weed Science Society of America.
368
2023 Vegetable Crop Handbook for Southeastern United States
Southeastern U.S. Vegetable Crop Handbook - 2023

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