Southeastern U.S. Vegetable Crop Handbook - 2023 - 371

WEED CONTROL
TABLE 4-26. CHEMICAL WEED CONTROL IN TOMATOES (CONT'D)
Weed
Herbicide,
Mode of Action Code*
and Formulation
TOMATO, Row Middles (cont'd)
Contact kill of all green
foliage
paraquat, MOA 22
(Parazone) 3 SL
(Gramoxone SL) 2 SL
0.5 to 1
1.3 pt
Apply for control of emerged weeds between rows of tomatoes. Do not
allow spray to contract crop or injury will occur. Do not make more than 3
applications per season. PHI = 30 days. Paraquat product labels require
applicators to take an EPA-approved training every 3 years to mix, load,
and apply paraquat.
*Mode of action (MOA) code developed by the Weed Science Society of America.
Amount of
Formulation
Per Acre
Pounds Active
Ingredient
Per Acre
Precautions and Remarks
TABLE 4-27. CHEMICAL WEED CONTROL IN WATERMELONS (CONT'D)
Weed
Herbicide,
Mode of Action Code*
and Formulation
WATERMELON, 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,
apply 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. 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.
Contact kill of all green
foliage, stale bed
application
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 or transplanting 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. Plant with a
minimum of soil movement for best results. 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.
Morningglory and
small pigweed
pyraflufen ethyl, MOA 14
(ET Herbicide) 0.208 L
1 to 2 oz
0.0016 to
0.0032
Bareground. Wait 1 day following preplant burndown application before
planting.
Plastic Mulch Production. May apply over mulch; however, a single
0.5 in. irrigation/rain event plus a 7-day waiting period must occur before
transplanting. Apply ET with a crop oil concentrated at 1% v/v to sensitive
weeds that are less than 3 in.
Emerged broadleaf
and grass weeds
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, stale bed
application
pelargonic acid, MOA 26
(Scythe) 4.2 EC
carfentrazone-ethyl,
MOA 14
(Aim) 1.9 EW or 2 EC
glyphosate, MOA 9
(numerous brands and
formulations)
Up to 2 oz
See labels
See label
See label
Apply as a preplant burndown treatment, or prior to crop emergence from
seed, or as a directed or shielded spray between beds. Avoid contact of
watermelon foliage.
Up to 0.031 Transplants only. Apply prior to transplanting of crop. Use a nonionic surfactant
or crop oil with Aim. See label for rate. Cover age is essential for
good weed control. Can be tank mixed with other registered herbicides.
See labels
Apply to emerged weeds at least 3 days before seeding or transplanting.
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. Perennial
weeds may require higher rates of glyphosate. Consult the manufacturer's
label for rates for specific weeds. Certain glyphosate formulations require
the addition of a surfactant. Adding a nonionic surfactant to glyphosate
formulated with nonionic surfactant may result in reduced weed control.
Emerged 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.
*Mode of action (MOA) code developed by the Weed Science Society of America.
Amount of
Formulation
Per Acre
Pounds Active
Ingredient
Per Acre
Precautions and Remarks
2023 Vegetable Crop Handbook for Southeastern United States
371

Southeastern U.S. Vegetable Crop Handbook - 2023

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