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Sweet Potato – Weeds 288 Midwest Veg Guide 2022 Thrips Pesticide Admire Pro (4.6SC) (imidacloprid) | In-furrow spray or side dress 4.4-10.5 fl. oz. per acre or 0.31-0.74 fl. oz. per 1,000 ft. of row. Do not exceed 10.5 fl. oz. or 1 application per acre per season. REI: 12-hour. PHI: 125-day. IRAC 04A. Entrust SC (2) (spinosad) | Use 2SC formulations at 4.5- 10.0 fl. oz. per acre and do not exceed 21 fl. oz. per acre per season. Use 80WP formulations at 1.5-3.0 oz. per acre and do not exceed 9 oz. per acre per season. REI: 4-hour. PHI: 7- day. IRAC 05. OMRI-listed. Radiant 1SC (spinetoram) | 6.0-8.0 fl. oz. per acre. Do not exceed 32 fl. oz. per acre per season. REI: 4-hour. PHI: 7- day. IRAC 05. Warrior II (2.08CS) (lambda-cyhalothrin) | 1.28-1.92 fl. oz. per acre. Do not exceed 7.68 fl. oz. per acre per season. REI: 24-hour. PHI: 7-day. IRAC 03A. RUP. Wireworms Pesticide Brigade 2EC (bifenthrin) | 9.6-19.2 fl. oz. per acre. Use 2EC formulations at 9.6-19.2 fl. oz. per acre and do not exceed 6.4 fl. oz. per acre per season as a preplant- incorporated broadcast, directed bed spray, or T-band spray into the planting furrow and do not exceed 32 fl. oz. per acre per season.. Do not use 10DF, 10WP, or 10WSB formulations as they are not labeled for sweet potatoes. Allow 21 days between applications. REI: 12-hour. PHI: 21-day. IRAC 03A. RUP. Capture LFR (1.5) (bifenthrin) | Apply at planting at 12.75- 25.5 fl. oz. per acre, or apply as a foliar spray at 2.8-8.5 fl. oz. per acre. Do not exceed 2 applications per season. REI: 12- hour. PHI: 21-day, IRAC 03A. RUP. Platinum 2SC (thiamethoxam) | Use 2SC formulations at 5- 8 fl. oz. per acre and do not exceed 8 fl. oz. per acre per season. Use 75SG formulations at 1.66-2.67 oz. per acre and do not exceed 2.67 oz. per acre per season. Apply as in- furrow spray during planting only. REI: 12-hour. IRAC 04A. Sweet Potato – Weeds Reviewed by Stephen Meyers, Ben Phillips – Sept 2021 Recommended Controls All Weeds The critical period for weed control in sweet potato is between 2-6 weeks after transplanting. Maintaining the crop weed-free during this period of time allows the vines to close canopy and compete better with weeds later in the season. Herbicide choices are limited, especially for postemergence control of broadleaf weeds. For this reason, it is important to include pre-emergence herbicides and mechanical control in the weed management plan. 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. The more quickly vines cover the soil surface, the better they will suppress late-emerging weeds. In-row plant spacing can be decreased to close canopy more quickly. However, this practice can delay storage root bulking later in the growing season. Sweet potatoes 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 rows 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 some 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. In bare-soil production, rolling cultivators on wide tool- bars offer effective high-speed cultivation between rows and can also hill before row closure from vines. Pesticide