Midwest Vegetable Guide - 2022 - 279

Sweet Corn - Weeds
season at plant application. Do not use 10DF, 10WP, or
10WSB formulations; they are not labeled for sweet corn.
Allow 7 days between applications. REI: 12-hour. PHI: 30day.
IRAC 03A. RUP.
Capture LFR (1.5) (bifenthrin) | 0.2-0.78 fl. oz. per 1,000
linear bed ft. of row. Apply at planting in furrow or a T-band.
See label. REI: 12-hour. IRAC 03A. RUP.
Counter 20G (terbufos) | 4.5-6.0 oz. per 1,000 linear ft. or
row. Available as Lock 'N Load, SmartBox, and
SmartCartridge. Do not exceed 1 application per acre per
crop. REI: 48-hour. IRAC 01B. RUP.
Force CS (2.1SC) (tefluthrin) | 0.46-0.57 fl. oz. per 1,000
linear ft. of row. Apply Force Evo (2.1CS) at 0.46-0.57 fl. oz.
per 1,000 linear ft. of row. Apply Force 6.5G at 1.8-2.3 oz.
per 1,000 linear ft. of row. Apply Force 3G at 4-5 oz. per
1,000 liner ft. of row. Apply Force 10G at 1.25-1.5 oz. per
1,000 linear ft. or row. Apply at planting. Do not exceed 1
application per crop. REI: 48-hour. IRAC 03A. RUP.
Mocap 15G (ethoprop) | 8 oz. per 1,000 linear ft. of row.
Apply in band over closed seed furrow and incorporate with
tines or drag chains. Do not place in the furrow or in direct
contact with the seed. Do not exceed 1 application per crop
per year. REI: 48-hour. IRAC 01B. RUP.
Seed treatments for insects (thiamethoxam, spinosad,
abamectin) | Plant seed that has been treated with an
insecticide prior to planting. Although most sweet corn seed
has been treat with fungicide, it is seldom treated with an
insecticide to prevent seed and seedling damage. Use
diazinon, Cruiser, or Poncho. Follow label directions. IRAC
04A, IRAC 05, IRAC 06.
Thimet 20G (phorate) | 4.5-6 oz. per 1,000 linear ft. of row.
Place in a 7-inch band over the row behind the planter shoe
and in front of or behind the press wheel and lightly
incorporate. REI: 48-hour. IRAC 01B. RUP.
Sweet Corn - Weeds
Reviewed by Stephen Meyers, Ben Phillips - Sept 2021
Recommended Controls
All Weeds
Weed control methods in sweet corn vary by production
system and variety.
For sweet corn that is no-till, direct-seeded into a killed crop
(such as after a rye cover crop, or wheat) growers often use a
burndown herbicide with a preemergence herbicide. For
sweet corn direct-seeded into tilled soil, growers often
combine one or more preemergence herbicides at planting
with one or more cultivations. Sometimes, growers also apply
a preemergence herbicide after the last cultivation to improve
control of late-emerging weeds. Small, emerged weeds in
both systems can be controlled with selective postemergence
herbicides and/or shielded applications of nonselective
herbicides.
For early sweet corn direct-seeded under vented plastic row
cover, some herbicides are applied before laying the plastic to
prevent germinating weeds along with the early corn. But,
without good incorporation or irrigation for activation these
rows will usually need extensive clean up after the row-cover
comes off.
There are sweet corn varieties that are tolerant of glyphosate
(RoundUp-Ready), glufosinate (Liberty-Link), or sethoxydim
(Poast-Protected) applications over-the-top of the crop.
Confirm the herbicide tolerance traits of your sweet corn
before making an over-the-top herbicide application.
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
A stale seedbed can be prepared prior to transplanting with
flame weeding or very shallow cultivation to control emerged
weeds, instead of herbicides. Later plantings of sweet corn
lend themselves to this stale seedbed practice because they
are often planted after common weeds have emerged in tilled
soil. Uniform and close plant spacing in the row promotes
rapid canopy cover, and fresh market growers can keep larger
between-row spacing clean with between-row cultivation
tools for hand-pickers or mechanical harvesters. Rolling
cultivators on wide tool-bars offer effective, high-speed
between-row cultivation.
Pesticide
2,4-D amine products (2,4-D) POST
| 4L amine
formulations at 0.5-1.5 pts. per acre. Use lower rates on
annual weeds and higher rates on perennial weeds in the bud
stage. Use drop nozzles if corn is more than 8 inches tall. Do
not apply to open whorls or from 2 week before tasseling
through harvest. Avoid drift onto other vegetable crops. Can
cause severe injury to some varieties. REI: 48-hour. PHI: 45day.
HRAC 04.
Midwest Veg Guide 2022
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Midwest Vegetable Guide - 2022

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