Midwest Vegetable Guide - 2022 - 219

Okra - Weeds
Mustang Maxx (0.8) (zeta-cypermethrin) | 2.24-4.0 fl. oz.
per acre. REI: 12-hour. PHI: 1-day. IRAC 03A. RUP.
Pyganic EC 5.0 II (0.41) (pyrethrins) | Foliar applications:
4.5-15.6 fl. oz. per acre. Soil drench applications (in
greenhouses): 0.375 fl. oz. per 1,000 sq. ft. of growing
media/soil. Do not exceed 15.61 fl. oz. per acre. Do not
reapply within 3 days except under extreme pest pressure.
REI: 12-hour. IRAC 03A. OMRI-listed.
Sevin XLR Plus (4SC) (carbaryl) | 1.0-1.5 qts. per acre. Do
not exceed 6 qts. per acre per season. REI: 12-hour. PHI: 3day.
IRAC 01A.
Okra - Weeds
Reviewed by Stephen Meyers, Ben Phillips - Sept 2021
Recommended Controls
All Weeds
Okra is a warm-season crop that is nearly always started with
transplants in Northern climates.
Postemergence herbicides for broadleaf weeds are limited, so
it is important to include preemergence herbicides and
mechanical control in the weed management plan. There are
several herbicides labeled for the control of weeds
preemergence, applied before crops are transplanted, or
directed between the rows only after transplanting.
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. Okra can benefit from the soil
warming properties of plastic mulch in addition to the in-row
weed control it provides. Materials include landscape
cloth/fabric, plastic, and biodegradeable plastic. Straw mulch
can delay growth by suppressing soil temperatures. Weeds
between beds and along the edges of beds can be controlled
with a combination of cultivation, mowing, or hand
hoeing/pulling. Weeds along the edge of the mulches can be a
particular challenge to avoid ripping the mulch. Some fresh
market plantings are often small enough to accommodate
hand-hoeing or pulling. For larger plantings it may make
more sense to mechanically cultivate with tow-able tools
between plastic rows or between bare-soil rows.
Pesticide
Aim EC (2) (carfentrazone) POST
| 0.5-2.0 fl. oz. per
acre. Apply prior to transplanting or apply between crop rows
with hooded sprayer. Do not allow spray to contact crop. Use
COC or NIS. Weeds must be actively growing and less than 4
inches tall. Do not exceed 6.1 fl. oz. per acre per season. REI:
12-hour. HRAC 14.
Callisto (40SC) (mesotrione) POST PRE
| 6 fl. oz.
per acre. Band to row middles prior to weed emergence.
Leave 1 foot over row or 6 inches on each side of row
unsprayed. Do not apply directly over the planted okra row or
severe injury may occur. Injury risk is greatest on coarsetextured
soils (sand, sandy loam, or loamy sands). A
postemergence hooded application can be made at 3 oz. per
acre when okra is at least 3 inches tall at time of application.
Add 0.25% NIS v/v to spray solution. Avoid any contact with
okra plant foliage. Do not exceed 1 application and 6 oz. per
acre per year. REI: 12-hour. PHI: 28-day. HRAC 27.
Caparol 4L (prometryn) POST PRE
| 1.5 pts.
per acre. Apply as a post-directed spray when okra has 7-9
leaves and weeds are less than 2 inches tall. Do not exceed 3
pts. per acre per year. REI: 12-hour. PHI: 14-day. HRAC 05.
Dual Magnum (7.62EC) (s-metolachlor) PRE
| 12
pts. per acre. Indiana, Michigan, Minnesota, and Ohio only.
MI 24c exp. 12/31/21. MN 24c exp. 12/31/25. OH 24c exp.
12/31/22. Apply to okra at least 4 inches tall before weeds
emerge. Direct the spray to minimize contact with crop
foliage, or apply only between crop rows. Do not incorporate.
Do not exceed 2 pts. per acre or 1 application per crop per
season. REI: 24-hour. PHI: 60-day. HRAC 15.
glyphosate products (glyphosate) POST
| 0.753.75
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 at least 3 days before transplanting, or apply
between crop rows with hooded or shielded sprayers. Use low
rate for annuals and higher rates for perennials. See label for
suggested application volume and adjuvants. Remove
herbicide residue from plastic mulch prior to transplanting.
REI: 4-hour to 12-hour. PHI: 14-day. HRAC 9.
Midwest Veg Guide 2022
219
Midwest Vegetable Guide - 2022

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