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Rhubarb – Insects Midwest Veg Guide 2022 249 Rhubarb – Insects Reviewed by Laura Ingwell – Sept 2021 Recommended Controls Aphids Pesticide Actara (25WDG) (thiamethoxam) | 1.5-3.0 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 2.0- 4.0 oz. per acre and do not exceed 20 oz. per acre per season. Use 70WP formulations at 0.8-1.7 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. Belay (2.13SC) (clothianidin) | Soil applications: 9-12 fl. oz. per acre of 2.13SC formulation. 4.8-6.4 oz. per acre of 50WDG formulation. Foliar applications: 3-4 fl. oz. per acre of 2.13SC formulation. 1.6-2.1 oz. per acre of 50WDG formulation. Do not exceed 0.2 lb active ingredient clothianidin per acre per year. See bee warning on label. REI: 12-hour. PHI: 7-day. IRAC 04A. Beleaf (50SG) (flonicamid) | 2-2.8 oz. per acre. REI: 12- hour. PHI: 0-day. IRAC 29. 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. Fulfill (50WDG) (pymetrozine) | 2.75 oz. per acre. Do not exceed 5.5 oz. per acre per season. REI: 12-hour. PHI: 1-day. IRAC 09B. Perm-Up 25DF (permethrin) | 3.2-12.8 oz. per acre. Use 25W, 25WP or 25DF formulations at 6.4-12.8 oz. per acre and do not exceed 64 oz. per acre per season. Use 3.2EC formulations at 2-8 fl. oz. per acre and do not exceed 80 fl. oz. per acre per season. Allow 7 days between applications. REI: 12-hour. PHI: 1-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. Caterpillars There are many minor caterpillar pests of rhubarb, including corn earworm/tomato fruitworm, tomato hornworm, European corn borer, cutworms, loopers, and armyworms. Always check the label for the specific list of caterpillars that the product can be used on. Non-Pesticide Remove curly dock weeds from fields and field edges. Curly dock is the normal host for common stalk borer caterpillars that feed on rhubarb. Pesticide Baythroid XL (1EC) (beta-cyfluthrin) | 0.8-3.2 fl. oz. per acre. For armyworms, cutworms, loopers, corn earworm, and European corn borer. See label for pest-specific rates. Do not exceed 12.8 fl. oz. per acre per season. REI: 12-hour. PHI: 0- day. IRAC 03A. RUP. Brigade 2EC (bifenthrin) | 2.1-6.4 fl. oz. per acre. Caterpillars include armyworms, cutworms and loopers. 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. Coragen (1.67SC) (chlorantraniliprole) | 3.5-7.5 fl. oz. per acre. For armyworms and loopers. Can be applied through soil or foliar applications. Do not exceed 15.4 fl. oz. per acre per season. REI: 4-hour. PHI: 1-day. IRAC 28. Entrust SC (2) (spinosad) | For armyworms and loopers. Use 2SC formulations at 3.0-8.0 fl. oz. per acre and do not exceed 29 fl. oz. per acre per season. Use 80WP formulations at 0.5-2.5 oz. per acre and do not exceed 9 oz. per acre per