Midwest Vegetable Guide - 2022 - 86

Asparagus - Weeds
Tarnished Plant Bug
Pesticide
Assail 30SG (acetamiprid) | Use 30SG formulations at 5.3
oz. per acre and do not exceed 10.7 oz. per acre per season.
Use 70WP formulations at 2.3 oz. per acre and do not exceed
4.6 oz. per acre per season. Apply to fern only after harvest
has been completed. Allow 10 days between applications
REI: 12-hour. PHI: 1-day. IRAC 04A.
Perm-Up 25DF (permethrin) | Use 25W, 25WP or 25DF
formulations at 3.2-6.4 oz. per acre and do not exceed 25.6
oz. per acre per season. Use 3.2EC formulations at 2-4 fl. oz.
per acre and do not exceed 16 fl. oz. per acre per season.
Allow 7 days between applications. REI: 12-hour. PHI: 1day.
IRAC 03A. RUP.
Asparagus - Weeds
Reviewed by Stephen Meyers, Ben Phillips - Sept 2021
Recommended Controls
All Weeds
Before establishing an asparagus planting, reduce perennial
weeds in the area to be planted with systemic broad-spectrum
herbicides. Herbicide options are limited in the planting year.
After the first year of establishment, a typical weed control
program in asparagus includes a preemergence herbicide with
a long residual applied before asparagus emerges. If needed,
a preemergence herbicide may be applied again after harvest
is finished and a clean mowing.
Postemergence herbicides may be applied before asparagus
emergence or during or after the harvest season. Some require
directed or shielded spray applications to avoid spraying
asparagus.
It is important use herbicides with different modes of action
from year to year with this perennial crop to avoid buildup of
weed species not controlled by a particular mode of action.
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.
86
Non-Pesticide
Good weed control in the planting year is especially
important. Multivators, tines, rolling cultivators, and flame
weeders work well before emergence of asparagus, but it is
important to avoid damaging crowns when cultivating.
Cultivate row-middles and hand-hoe after emergence. Flame
weeders can also be used after clean harvest or mowing.
Once established, straw mulch can be applied any time, but is
easier for picking when applied after final harvest.
Pesticide
2,4-D amine products (2,4-D) POST
| Use 3-4 pts. per
acre of liquid formulations with 3.8 lbs. per gal. acid
equivalent, or 1.5-2.5 lbs. per acre of dry formulations with
78.9% acid equivalent. Apply before, during, or after the
harvest season. During harvest season apply immediately
after cutting. Discard deformed spears. Use drop nozzles for
treatments after harvest to avoid spraying fern. Wait at least
30 days between applications. REI: 48-hour. PHI: 3-day.
HRAC 04.
Aim EC (2) (carfentrazone) POST
| 0.5-1.92 fl.
oz. per acre. Include 0.5 pt. NIS or 0.25-0.5 gals. COC per 25
gals. of spray solution. Broadcast after spear harvest.
Emerged asparagus will be injured. Do not exceed 3.8 fl. oz.
per acre per season. Wait at least 20 days between
applications. REI: 12-hour. PHI: 5-day. HRAC 14.
Callisto (40SC) (mesotrione) POST PRE
| 3-7.7 fl.
oz. per acre. Apply in spring before spears emerge after
mowing, disking, or tilling; after final harvest; or both. For
postharvest applications use drop nozzles or other equipment
that will minimize contact with crop. Adding COC or NIS
(alone or with UAN or AMS) will improve emerged weed
control and increase crop injury risk in postharvest
applications. Do not exceed 2 applications per year, or 7.7 fl.
oz. per acre per year. REI: 12-hour. HRAC 27.
Chateau SW (51WDG) (flumioxazin) PRE
| 6 oz.
per acre. Established plantings only. Apply to dormant
asparagus at least 2 weeks before spears emerge. Crop injury
may result if asparagus is not dormant. May be tank-mixed
with paraquat to control emerged weeds. Or, apply after final
harvest for the season before fern emerges. Do not exceed 6
oz. per acre per growing season. REI: 12-hour. HRAC 14.
Clarity (4WS) (dicamba) POST
Midwest Veg Guide 2022
| 0.5-1.0 pt. per acre.
Apply in 40-60 gals. of water per acre immediately after
cutting. Discard crooked spears at harvest. Clarity can injure
Midwest Vegetable Guide - 2022

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