Midwest Vegetable Guide - 2022 - 246

Potato - Weeds
5FS, Cruiser Maxx, and Cruiser Maxx Potato). For best
results, plant potatoes immediately after treatment. PHI: See
label. IRAC 04A, IRAC 05, IRAC 06.
Thimet 20G (phorate) | Light or sandy soils: 8.5-11.3 oz. per
1,000 ft. of row for any row spacing larger than 32-inches.
Use at planting or postemergence. Heavy or clay soils: 13.017.3
oz. per 1,000 ft. of row. Do not use post emergence.
Apply as a band application on each side of row and beneath
soil surfaces, or in the seed furrow. REI: 48-hour. PHI: 90day.
IRAC 01B. RUP.
Potato - Weeds
Reviewed by Stephen Meyers, Ben Phillips - Sept 2021
Recommended Controls
All Weeds
A relatively large number of herbicides are labeled for use on
potatoes, and there are many opportunities to apply them
because the hilling process recreates a preemergent crop
situation by burying crop leaves and protecting them from
soil surface sprays.
For specific weeds controlled by each herbicide, check the
Relative Effectiveness of Herbicides for Vegetable Crops
table.
Rates provided in the recommendations below are given for
overall coverage. For a banded treatment, reduce amounts
according to the portion of acre treated.
Non-Pesticide
Eptam 7E (EPTC) PRE
Potato cultural practices offer several good opportunities to
control weeds, beginning with the period between planting
and emergence (when early-emerging weeds can be killed by
flaming), and continuing through the hilling process (when
weeds can be buried or cultivated out). Some organic farmers
also use flaming after potatoes emerge because some injury
to the potato foliage early in the season can be tolerated.
Rolling cultivators on wide tool-bars offer effective highspeed
cultivation between rows and can also hill.
Pesticide
Aim EC (2) (carfentrazone) POST
| Eptam 7E at 3.5-7 pts.
per acre, or Eptam 20G at 15-20 lbs. per acre. Apply before
planting, after drag-off, or as directed spray at lay-by.
Incorporate immediately. On muck soils, supplement with
linuron or metribuzin products applied before crop emerges
and after drag-off. The Superior variety may be sensitive.
Suppresses nutsedge. REI: 12-hour. PHI: 45-day. HRAC 15.
glyphosate products (glyphosate) POST
| 0.75|
0.5-2 fl. oz. per
acre. Apply prior to or within 24 hours of planting, or apply
between crop rows with hooded sprayer. Do not allow spray
to contact crop. Use COC or NIS. Weeds must be actively
246
3.75 lbs. acid equivalent (ae) per acre. Use formulations
containing 3 lbs. ae per gal. (4 lbs. isopropylamine salt per
gal.) at 1-5 qts. per acre, or formulations containing 4.5 lbs.
ae per gal. (5 lbs. potassium salt per gal.) at 0.66-3.3 qts. per
acre. Broadcast before planting, after planting before ground
cracks, or apply between crop rows with wipers or hooded or
shielded sprayers. Use low rate for annuals and higher rates
for perennials. See label for suggested application volume
Midwest Veg Guide 2022
growing and less than 4 inches tall. Do not exceed 6.1 fl. oz.
per acre per season. REI: 12-hour. PHI: 7-day. HRAC 14.
Chateau SW (51WDG) (flumioxazin) PRE
| 1.5 oz.
per acre. Minnesota only -- supplemental label. Apply to
potatoes after hilling. A minimum of 2 inches of soil must
cover vegetative plant parts when applied to avoid injury.
Provides suppression of lambsquarters, nightshades,
pigweeds, wild mustard, and wild radish. Tank-mixes
recommended to improve efficacy. REI: 12-hour. HRAC 14.
clethodim products (clethodim) POST
| Use 2EC
formulations at 6-16 fl. oz. per acre with 1 qt. of COC per 25
gals. of spray solution (1% v/v). Use Select Max at 9-32 fl.
oz. per acre with 8 fl. oz. of NIS per 25 gals. of spray solution
(0.25% v/v). Use low rates for annual grasses, the high rates
for perennial grasses. Spray on actively growing grass. Wait
at least 14 days between applications. Do not exceed 32 fl.
oz. of 2EC formulations or 64 fl. oz. of Select Max per acre
per season. REI: 24-hour. PHI: 30-day. HRAC 01.
Dual Magnum (7.62EC) (s-metolachlor) PRE
| 12
pts. per acre. Dual Magnum or Dual II Magnum at 1-2 pts.
per acre. Use lower rates on coarse soils. Apply and
incorporate before planting, or apply after planting before
weeds emerge. May also be applied at 1.67 pts. per acre after
hilling. Dual Magnum might delay maturity and/or reduce
yield of Superior and other early maturing varieties if cold,
wet soil conditions occur after treatment. Dual Magnum can
be tank-mixed with Lorox, Sencor, Prowl or Eptam. See
labels. Do not exceed 3.6 pts. per acre. REI: 24-hour. PHI:
60-day if applied before drag-off, or 40-day if applied at layby.
HRAC 15.
Midwest Vegetable Guide - 2022

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