Southeastern U.S. Vegetable Crop Handbook - 2022 - 366

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%
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
Up to 2 oz
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.
paraquat, MOA 22
(Parazone) 3SL
(Gramoxone SL) 2 SL
0.5 to 1
1.3 to 2.7 pt
2 to 4 pt
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 trans- planted
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.
trifluralin, MOA 3
(Treflan HFP, Trifluralin,
Trifluralin HF, various
other trade names) 4 EC
0.5
1 pt
*Mode of action (MOA) code developed by the Weed Science Society of America.
Transplant tomato. Apply pretransplant and incorporate into the soil 2 to 3 in. within
8 hours using a rototiller or tandem disk. Can be applied postplanting as a directed
spray to soil between the rows and beneath plants and then incorporated. Cold soil
temperatures may exacerbate injury from trifluralin.
Amount of
Formulation
Per Acre
Pounds Active
Ingredient
Per Acre
Precautions and Remarks
366
2022 Vegetable Crop Handbook for Southeastern United States

Southeastern U.S. Vegetable Crop Handbook - 2022

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