Midwest Vegetable Guide - 2022 - 251

Rhubarb - Weeds
crop is especially important. Eggs laid in rhubarb do not
survive, they are crushed by the growing plant tissue.
There are no registered insecticides that will give adequate
control.
Non-Pesticide
Remove weed hosts (dock, thistle, and sunflower) from fields
and field edges.
Stink Bugs
Pesticide
Brigade 2EC (bifenthrin) | 2.1-6.4 fl. oz. per acre. Use 2EC
formulations at 2.1-6.4 fl. oz. per acre and do not exceed 32
fl. oz. per acre per season. Use 10DF, 10WP, or 10WSB
formulations at 5.3-16 oz. per acre and do not exceed 80 oz.
per acre per season. Allow 7 days between applications. REI:
12-hour. PHI: 7-day. IRAC 03A. RUP.
Pyganic EC 5.0 II (0.41) (pyrethrins) | 4.5-15.6 fl. oz. per
acre foliar application, or 0.375 fl. oz. per 1,000 sq. ft.
growing media for soil drench application (in greenhouse).
Do not exceed 15.61 fl. oz. per acre. Do not reapply within 3
days except under extreme pest pressure. REI: 12-hour. PHI:
PHI: 0-day. IRAC 03A. OMRI-listed.
Whiteflies
Pesticide
Actara (25WDG) (thiamethoxam) | 3.0-5.5 fl. oz. per acre.
Apply as a foliar spray. Do not exceed 11 oz. per acre per
season. Allow 7 days between applications. REI: 12-hour.
PHI: 7-day. IRAC 04A.
Admire Pro (4.6SC) (imidacloprid) | 4.4-10.5 fl. oz. per
acre. Applied at soil. Do not exceed 10.5 fl. oz. per acre per
season. REI: 12-hour. PHI: 45-day. IRAC 04A.
Assail 30SG (acetamiprid) | Use 30SG formulations at 3.04.0
oz. per acre and do not exceed 20 oz. per acre per season.
Use 70WP formulations at 1.1-1.7 oz. per acre and do not
exceed 8.5 oz. per acre per season. Allow 7 days between
applications. REI: 12-hour. PHI: 7-day. IRAC 04A.
Brigade 2EC (bifenthrin) | 2.1-6.4 fl. oz. per acre. Use 2EC
formulations at 2.1-6.4 fl. oz. per acre and do not exceed 32
fl. oz. per acre per season. Use 10DF, 10WP, or 10WSB
formulations at 5.3-16 oz. per acre and do not exceed 80 oz.
per acre per season. Allow 7 days between applications. REI:
12-hour. PHI: 7-day. IRAC 03A. RUP.
Platinum 2SC (thiamethoxam) | Use 2SC formulations as a
soil treatment at 5-11 fl. oz. per acre and do not exceed 11 fl.
oz. per acre per season. Use 75SG formulations as a soil
treatment at 1.66-3.67 oz. per acre and do not exceed 3.67 oz.
per acre per season. REI: 12-hour. PHI: 30-day. IRAC 04A.
Pyganic EC 5.0 II (0.41) (pyrethrins) | 4.5-15.6 fl. oz. per
acre foliar application, or 0.375 fl. oz. per 1,000 sq. ft.
growing media for soil drench application (in greenhouse).
Do not exceed 15.61 fl. oz. per acre. Do not reapply within 3
days except under extreme pest pressure. REI: 12-hour. PHI:
PHI: 0-day. IRAC 03A. OMRI-listed.
Sivanto 200 (1.67SL) (flupyradifurone) | Use Sivanto
200SL and Sivanto Prime at 7-14 fl. oz. per acre. See label
for specific pest rates. Do not exceed 28 fl. oz. per acre per
crop season. REI: 4-hour. PHI: 1-day. IRAC 04D.
Rhubarb - Weeds
Reviewed by Stephan Meyers, Ben Phillips - Sept 2021
Recommended Controls
All Weeds
Before establishing a rhubarb planting, reduce perennial
weeds in the area to be planted with systemic broad-spectrum
herbicides.
Herbicides that control broadleaves must be applied while
rhubarb is dormant or with shielded equipment between the
row, as stated on the label. Herbicides that kill only emerged
grasses may be applied over the top of rhubarb plants.
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
Good weed control in the planting year is especially
important. Multivators, tines, rolling cultivators, flame
weeders work well before emergence of rhubarb, but it is
important to avoid damaging crowns when cultivating.
Cultivate row-middles and hand-hoe after emergence. Once
established and before spring growth, harrow bed thoroughly
but carefully to avoid injuring the crowns. During the
growing season, cultivate row-middles and hand hoe to keep
the planting clean. Following the first light freeze in fall,
Midwest Veg Guide 2022
251
Midwest Vegetable Guide - 2022

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