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2022 Midwest Vegetable Guide

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Sweet Potato – Horticulture 283 Starane Ultra (2.8) (fluroxypyr) POST | 0.4 pt. per acre. Apply broadcast or as a directed spray to corn that has up to 4 fully exposed leaf collars. Use directed spray when corn is beyond the 4-leaf collar stage. For volunteer potato, can apply preplant to emerged potato followed by a second application postemergence to emerged potato. REI: 24-hour. PHI: 31-day. HRAC 04. Stinger (3) (clopyralid) POST | 0.33-0.66 pt. per acre. Spray on actively growing weeds before corn is 18 inches tall. Controls composites and nightshade. Wait 21 days between applications. Do not exceed 0.66 pt. per acre per year. REI: 12-hour. PHI: 30-day. HRAC 04. Zidua (85WDG) (pyroxasulfone) PRE | 1.0-4.0 oz. per acre. Apply before or after planting and before crop emergence, or at spiking up to V4 (4 leaf collars visible). May be incorporated. Will not control emerged weeds. May be tank-mixed or applied sequentially with many other products. Seed at least 1 inch deep. Do not exceed 2.75 oz. per acre per season on coarse soils. Do not exceed 5 oz. per acre per season on other soils. REI: 12-hour. PHI: 37-day. HRAC 15. Sweet Potato – Horticulture Major update by Ben Phillips, Liz Maynard – Oct 2020 Reviewed by Liz Maynard – Aug 2021 Crop Description Sweet potatoes (Ipomoea batatas) are of tropical origin and are related to morning glories. They can perform well in the Midwest too. The varieties that are easiest to get, and that perform well in the Midwest are listed below. Some varieties need up to 140 frost free days to mature. Sweet potatoes can make for a productive hoophouse crop, and in this way the longer maturing varieties can also be grown. Asian sweet potato varieties are starchier than more commonly grown varieties, and often are white or purple fleshed, instead of orange. In the table below, FW = Fusarium wilt resistant, SRKN = Southern root knot nematode resistant, SSR = Streptomyces soil rot resistant, * = varieties that performed well in midwestern trials. Variety Name Description *Beauregard Red skin, orange flesh, vine type, 90-100 days. FW, SSR. *Carolina Ruby Red skin, orange flesh, vine type, 95-100 days. FW. *Centennial Orange skin, orange flesh, vine type, 100 days. FW. *Covington Red skin, orange flesh, bush type, Variety Name Description 95-105 days. FW, SRKN, SSR. Evangeline Red skin, orange flesh, vine type, 100 days. FW, SRKN, SSR. Hernandez Orange skin, orange flesh, vine type, 120 days. FW, SRKN, SSR. Georgia Jets Orange skin, orange flesh, vine type, 120 days. FW, SRKN, SSR. Molokai Purple Purple skin, purple flesh, vine type, 120 days. Starchy. Murasaki Purple skin, white flesh, bush type, 120 days. Starchy. FW, SRKN, SSR. O-Henry White skin, white flesh, vine type, 90-100 days. Starchy. FW, SSR. Okinawan Purple Beige skin, purple flesh, vine type, 140 days. Starchy. Porto Rico Orange skin, orange flesh, bush type, 100 days. FW. Vardaman Red skin, orange flesh, bush type, 100 days. FW. White Bonita White skin, white flesh, vine type, 110-115 days. SRKN. *Red Japanese Purple skin, purple flesh, vine type, 110 days. Starchy. FW. Planting and Spacing Root production: Water wheel and finger-style transplanters work well for mechanically planting sweet potato slips. Common spacing is 1 foot apart in the row, with rows 3 to 4 feet apart, depending upon the cultivating and harvesting equipment used. 14,520 slips per acre are required at the 1 foot by 3 feet spacing, while 10,890 are needed at the 1 foot by 4 feet spacing. Transplant only strong, stocky slips. Yields can be increased up to 100 bushels per acre by using strong transplants. It is common for the tops to wither after transplanting until they root. Transplanting with water is important to improve their rooting recovery time. Slips may be transplanted into beds covered with plastic mulch; the warmed soil will enhance growth and mulch will help with control. Slip/cutting production: Select seed stock from high- yielding hills that are smooth, well-shaped, and free of diseases (scurf, internal cork, wilt, black rot) and insect injury. When possible, obtain certified G1 or G2 (generation) seed stock. Store seed stock in new crates to avoid disease contamination. Seed potatoes should be at least 1-1/2 inches in diameter. One bushel of small- to medium-sized roots should produce 500 to 800 sprouts in 10 to 15 square feet of bed area (one cut). Slip/cutting production should be in movable protected systems (low or high tunnels) for early planting in the field to maximize production season. Before bedding, seed stock should be pre-sprouted at 85° F and 90% relative humidity for 3 to 4 weeks until the sprouts are 1 to 1-1/2 inch. Treat seed stock before planting with Mertect 340F to protect roots from soil-borne diseases. Bed the seed stock in clean land that has not been planted with sweet potato for 4 years. Optimal temperature for growth is 75° F to 85° F. Remove tunnels 7 days prior to planting to harden the slips. Midwest Veg Guide 2022

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