Southeastern U.S. Vegetable Crop Handbook - 2021 - 349

WEED CONTROL
TABLE 4-20. CHEMICAL WEED CONTROL IN POTATOES, IRISH (cont'd)
Weed
Herbicide,
Mode of Action Code*
and Formulation
Annual grasses, most
broadleaf weeds, plus
yellow and purple nutsedge
suppression
Most annual broadleaf
weeds and some
annual grasses
Most annual broadleaf
weeds and some
annual grasses
EPTC, MOA 8
(Eptam) 7 EC
Amount of
Formulation
Per Acre
POTATOES, IRISH, Preplant and Preemergence (cont'd)
3
3.5 pt
Apply preplant and incorporate into the soil 2 to 3 in. with a rototiller or tandem
disk. The variety Superior has been shown to be sensitive to Eptam. See label for
specific methods of incorporation. For late season preemergence nutsedge control,
apply and incorporate as a directed spray to the soil on both sides of the crop row.
See label for more detail.
flumioxazin, MOA 14
(Chateau) 51 SW
0.047
1.5 oz
Apply immediately after hilling. A minimum of 2 in. of soil must cover the vegetative
portion of the potato plant at the time of application of Chateau. Do NOT apply
to emerged potatoes. DO NOT incorporate Chateau or weed control will be
reduced. Can be tank mixed with burndown herbicides if weeds are present at
application. See label for further instructions.
linuron, MOA 7
(Lorox DF) 50 WDG
(Linex) 4L
metribuzin, MOA 5
(TriCor DF, Dimetric DF,
and other trade names)
75 WDG
rimsulfuron, MOA 2
(Matrix, Pruvin) 25 WDG
Broadleaf, grass and
nutsedge weeds
Broadleaf, grass (suppression)
and yellow
nutsedge
fomesafen, MOA 14
(Reflex) 2 EC
imazosulfuron, MOA 2
(League) 0.5 DF
0.75 to 1.5
1.5 to 3 lb
1.5 to 3 pt
0.23 to 1
0.33 to 1.33 lb
1 to 1.5 oz
1 pt
0.19 to 0.3
4 to 6.4 oz
0.016 to 0.023 Apply after drag-off or hilling but before potatoes and weeds emerge. If emerged
weeds are present, add surfactant. See label for rate. Can be tank mixed with Eptam,
Prowl, Sencor, Lorox, or Dual Magnum. See label for further instructions.
0.25
Apply preemergence after planting but prior to potato emergence. Do not apply as
a preplant incorporated application or to emerged potato or severe crop injury may
occur. Do not exceed rate of 1 pt per acre per season. PHI = 70 days.
Apply as a preemergence application after crop has been planted but prior to emergence
or immediately after hilling. Postemergence application (3.2 to 4 oz per acre)
may be made after crop has emerged if weeds are less than 3 in. in height. Do not
apply more than 6.4 oz per acre per season. Consult label for sequential application
program and crop rotation restrictions. PHI = 45 days.
POTATOES, IRISH, Postemergence
Most annual broadleaf
weeds and some
annual grasses
metribuzin, MOA 5
(TriCor DF and other trade
names) 75 WDG
rimsulfuron, MOA 2
(Matrix, Pruvin) 25 WDG
Most broadleaf weeds
less than 4 in. tall or
rosettes less than 3 in.
in diameter; does not
control grasses
carfentrazone-ethyl,
MOA 14
(Aim) 1.9 EW or 2 EC
Most emerged weeds glyphosate, MOA 9
(numerous brands and
formulations)
Annual and perennial
grasses only
clethodim, MOA 1
(Arrow, Clethodim,
Intensity, Select 2 EC
(Intensity One, Select Max)
1 EC
sethoxydim, MOA 1
(Poast) 1.5 EC
Annual broadleaf,
grass and yellow
nutsedge
S-metolachlor, MOA 15
(Brawl, Dual Magnum)
Up to 2 oz
See labels
0.25 to 0.5
0.33 to 0.67 lb
1 to 1.5 oz
Do not use on early maturing smooth-skinned white or red-skinned varieties. Apply
only if there have been at least three successive days of sunny weather before
application. Treat before weeds are 1 in. tall. Treatment may cause some chlorosis
or minor necrosis. PHI = 60 days.
0.016 to 0.023 Apply to young actively growing weeds after crop emergence. More effective on
small weeds. Add nonionic surfactant at 1 to 2 pt per 100 gal water. Can be tank
mixed with Eptam or Sencor or some foliar fungicides. See label for further instructions.
PHI = 60 days.
Up to 0.031 Apply post-directed using hooded sprayers for control of emerged weeds. If crop is
contacted, burning of contacted area will occur. Use a nonionic surfactant or crop oil
with Aim. See label for rate. Coverage of weed is essential for good weed control.
Can be tank mixed with other registered herbicides. PHI=7 days.
See labels Row middles only. 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, stems, exposed,
roots, or fruit of crop. PHI = 14 days.
6 to 8oz
9 to 32 oz
1 to 1.5 pt
1 to 1.33 pt
0.094 to 0.125
0.07 to 0.25
0.2 to 0.3
Apply postemergence for control of grasses. See label for adjuvant and rate. Adding
crop oil may increase the likelihood of crop injury at high air temperatures and high
humidity. Very effective in controlling annual bluegrass. Apply to actively growing
grasses not under drought stress. PHI = 30 days.
Apply to emerged grasses. Consult manufacturer's label for specific rates and best
times to treat and adjuvant and rate. Adding crop oil to Poast may increase the
likelihood of crop injury at high air temperatures and high humidity. PHI = 30 days.
0.95 to 1.26 Apply as interrow or interhill application. Leave a 1 ft. untreated area over the seeded
row (6 in. on either side of the row). Application made as a broadcast spray
over the planted row or hill or directly to crop foliage will increase the risk of
injury to the crop. Apply before weeds emerge. See label for further instructions.
* Mode of action (MOA) code developed by the Weed Science Society of America.
Apply just after planting or drag-off or hilling but before crop emerges. If emerged
weeds are present, add 1 pt surfactant for each 25 gal spray mixture. Weeds may
be up to 3 in. tall at time of application.
Apply just after planting or drag-off but before crop emerges. Weeds may be
emerged at time of application. On sand soils or sensitive varieties, do not exceed
0.67 lb per acre. See label for list of sensitive varieties.
Pounds Active
Ingredient Per
Acre
Precautions and Remarks
2021 Vegetable Crop Handbook for Southeastern United States
349

Southeastern U.S. Vegetable Crop Handbook - 2021

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