Southeastern U.S. Vegetable Crop Handbook - 2021 - 326

WEED CONTROL
TABLE 4-5. CHEMICAL WEED CONTROL IN CARROTS
Weed
Herbicide,
Mode of Action Code*
and Formulation
CARROTS, Preplant
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 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
Emerged broadleaf
and grass weeds
glyphosate, MOA 9
(numerous brands and
formulations)
pelargonic acid, MOA 26
(Scythe) 4.2 EC
See labels
See labels
Apply to emerged weeds before seeding or crop emergence. Perennial weeds
may require higher rates. Certain glyphosate formulations require the addition
of surfactant. Adding nonionic surfactant to glyphosate formulated with nonionic
surfactant may result in reduced weed control.
See label
See label
CARROTS, Preplant incorporated (PPI) or Preemergence (PRE)
Annual grasses and
small-seeded broadleaf
weeds
Broadleaf and grass
weeds
trifluralin, MOA 3
(Treflan, Trifluralin) 4 EC
prometryn, MOA 5
(Caparol) 4L
pendimethalin, MOA 3
(Prowl H2
O) 3.8 AS
CARROTS, Postemergence
Annual grasses and
broadleaf weeds
linuron, MOA 7
(Lorox DF) 50 WDG
0.75 to 1.5
1.5 to 3 lb
Apply as a broadcast spray after carrots are at least 3 in. tall. If applied earlier
crop injury may occur. Avoid spraying after three or more cloudy days. Repeat
applications may be made, but do not exceed 4 lb of Lorox DF per acre per season.
Do not use a surfactant or crop oil. Carrot varieties vary in their resistance;
therefore determine tolerance to Lorox DF before adoption as a field practice to
prevent potential crop injury. See label for further directions. PHI = 14 days.
Annual broadleaf
weeds and some
grasses
Annual and perennial
grasses
metribuzin, MOA 5
(Dimetric, Metribuzin,
TriCor DF) 75 WDG
(TriCor 4F) 4 F
clethodim, MOA 1
(Arrow, Clethodim,
Intensity, Select) 2 EC
(Select Max) 1 EC
fluazifop, MOA 1
(Fusilade DX) 2 EC
sethoxydim, MOA 1
(Poast) 1.5 EC
CARROTS, Row Middles
Most broadleaf weeds
less than 4 in. tall or
rosettes less than 3 in.
in diameter; does not
control grasses
0.33lb
0.5 pt
6 to 8oz
9 to 16 oz
6 to 16 oz
0.2 to 0.3
1 to 1.5 pt
0.25
0.25
0.094 to 0.125
0.07 to 0.125
0.1 to 0.25
Apply overtop when weeds are less than 1 in. tall and carrots have 5 to 6 true
leaves. A second application may be made after a time interval of at least 3
weeks. Do not apply unless 3 sunny days precede application. Do not apply within
3 days of other pesticide applications. PHI = 60 days.
Apply to actively growing grasses not under drought stress. See label for adjuvant
and rate. Adding crop oil may increase the likelihood of crop injury at high air
temperatures and high humidity. Do not mix with other pesticides. Very effective in
controlling annual bluegrass. PHI = 30 days.
Apply to actively growing grasses not under drought stress. Up to 48 oz of Fusilade
DX may be applied per year. See label for rates for specific weeds. See label
for adjuvant and rate. Do not mix with other pesticides. PHI = 45 days.
Apply to actively growing grasses not under drought stress. Consult manufacturer's
label for specific rate and best times to treat. Adding crop oil may increase the
likelihood of crop injury at high air temperatures and high humidity. Do not apply
with other pesticides. PHI = 30 days.
carfentrazone-ethyl,
MOA14
(Aim) 1.9 EW or 2 EC
Most emerged weeds glyphosate, MOA 9
(numerous brands and
formulations)
Up to 2 oz
See labels
See labels
Up to 0.031
Apply as a hooded spray in row middles for control of emerged weeds. If crop is
contacted, burning of contacted area will occur. Use a crop oil concentrate or a
nonionic surfactant with Aim. See label for directions. Coverage is essential for
good weed control. Can be tank mixed with other registered herbicides.
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.
*Mode of action (MOA) code developed by the Weed Science Society of America.
0.5 to 1
1 to 2 pt
1 to 2
2 to 4 pt
0.95
2 pt
Apply preplant and incorporate into the soil 2 to 3 in. within 8 hours. Use lower
rate on coarse soils with less than 2% organic matter.
Apply as preemergence and or postemergence over the top to carrot. Make POST
application through the six-leaf stage of carrot. See label for application rate and
crop rotation restrictions. PHI = 30 days.
Apply post plant within 2 days after planting but prior to crop emergence. See
label for instruction on layby treatment. PHI = 60 days.
Apply as a preplant burndown or prior to emergence of plants from seed. There is
no residual activity. May be tank mixed with soil residual herbicides. See label for
instructions. May also be used as a banded spray between row middles. Use a
shielded sprayer directed to the row middles to reduce drift to the crop.
Amount of
Formulation
Per Acre
Pounds Active
Ingredient
Per Acre
Precautions and Remarks
CAULIFLOWER - SEE COLE CROPS
326
2021 Vegetable Crop Handbook for Southeastern United States
Southeastern U.S. Vegetable Crop Handbook - 2021

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