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2022 Midwest Vegetable Guide

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Mint – Diseases 212 trifluralin products (trifluralin) PRE Beans (Dry), Beans (Fresh), Lima Beans, Peas (Dry), Peas (Fresh), Southern Peas/Cowpeas | 0.5-1 lb. a.i. per acre. Use 4E formulations at 1-1.5 pts. per acre for snap beans, lima beans, and peas, or up to 2 pts. per acre for dry beans. Use 10G formulations at 5-7.5 lbs. per acre for snap beans, lima beans, and peas, or up to 10 lbs. per acre for dry beans. Broadcast and incorporate 1-2 inches before seeding. Use low rate on coarse soils with less than 2% organic matter. Not effective on muck or high organic matter soils REI: 12-hour. HRAC 03. Mint – Horticulture Major update by Ben Phillips, Liz Maynard – Oct 2020 Reviewed by Liz Maynard – Aug 2021 Crop Description Mints are a group of perennial herbs that are commercially important as sources of essential oils obtained by distillation of their hay. The discussion in this section refers to production for essential oils. They are also commonly grown as a leaf herb; see the leafy vegetable section for common production practices for that product. The most common cultivated types are peppermint and spearmint. Peppermint (Mentha x piperita): All peppermints are a hybrid of two other species, watermint (M. aquatica) and native spearment (M. spicata). The varieties include Black Mitcham, Murray Mitcham, Robert's Mitcham, and Todd's Mitcham. The latter three varieties are more resistant to verticillium wilt. Spearmint: Scotch Spearmint (M. cardiaca) and Native Spearmint (M. spicata). These two species of spearmints have distinctly different oils. Because verticillium wilt disease is an important problem even with the more resistant varieties, growers should always use disease-free planting stock. Certified and disease-free stocks are available. Planting and Spacing Mints are grown from 3- to 4-inch long dormant runners dug from existing fields in the late fall or spring. They spend their first year as a row crop before spreading through runners. The following years are spent as a solid stand or meadow crop. Careful fall plowing of established stands is important for both winter protection and for reducing the incidence of mint rust and other foliar diseases. "Squirelly" mint, which occurs primarily on peppermint, is caused by the mint bud mite, Tarsonemus pipermenthae. Although mints are perennials, older stands may show serious build-ups of disease, insect, and weed problems and should be rotated out every 3 to 4 years. Fertilizing pH: Maintain a soil pH of 5.5 to 6.5. New plantings: Before planting new stolons, apply 40 pounds N per acre, 0 to 100 pounds P 2 O 5 per acre, and 0 to 400 pounds K 2 O per acre based on soil test results and recommendations from your state. Broadcast the fertilizer and plow it under when preparing the land for the planting furrows. Topdress with 40 pounds N per acre on muck soils, or 80 pounds N per acre for mineral soils in early June. Established plantings: Each year before emergence, broadcast or drill in 40 to 60 pounds N per acre, 0 to 50 pounds P 2 O 5 per acre and 0 to 150 pounds K 2 O per acre if a soil test recommends it. Topdress with 60 to 90 pounds N per acre after canopy closure. The total amount of N from fertilizer should be 120 to 150 pounds N per acre. Irrigation significantly increases oil yields on both muck and mineral soils, even in seasons with normal rainfall. Harvesting For oil production, maximum yield and quality is reached when 10% of peppermint is in full bloom, or 100% of spearmint is in full bloom. Cut, windrow, and allow to partially dry for 24 to 36 hours before collecting for distillation. The machines for this are similar to hay machines, but the collection into distillation tubs requires a specialized procedure and equipment. Mint – Diseases Reviewed by Dan Egel – Sept 2021 Recommended Controls Leaf Spot of Mint - Septoria Fungus Pesticide chlorothalonil products (chlorothalonil) | Indiana only. Several formulations of chlorothalonil (Bravo, Echo, Equus) are labeled at various rates. See product labels. REI: 12-hour. PHI: 80-day. FRAC M05. Midwest Veg Guide 2022

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