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2022 Midwest Vegetable Guide

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Rhubarb – Weeds Midwest Veg Guide 2022 251 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 3.0- 4.0 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,

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