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2022 Midwest Vegetable Guide

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Root Crops – Diseases 258 Midwest Veg Guide 2022 Reason 500SC (4.13) (fenamidone) Beet, Carrot, Celeriac, Horseradish, Parsnip, Radish, Rutabaga, Turnip | 8.2 fl. oz. per acre. Pythium damping-off only. REI: 12-hour. PHI: 14- day. FRAC 11. Uniform (L) (mefenoxam, azoxystrobin) Beet, Celeriac, Horseradish, Parsnip, Radish, Rutabaga, Turnip | 0.34 fl. oz. per acre per 1,000 ft. of row. Make one application per crop season. For damping-off caused by Pythium or Rhizoctonia spp. REI: 0-hour. PHI: NA FRAC 04, FRAC 11. Internal Root Discoloration of Horseradish - Fusarium and Verticillium Fungi This long-lived complex of soil pathogens reduce marketability by discoloring roots to a black color. Non-Pesticide Horseradish | Use disease-free root stocks generated from tissue-culture. Hot water seed treatment may reduce this disease in root clones. Use temperatures and times of 115 F for 10 minutes. Control volunteer horseradish in rotation years. Leaf Blight of Carrots - Xanthomonas Bacteria Copper products that are labeled for Cercospora may be helpful; however, bacteria may become resistant to copper products. Early bacterial leaf blight symptoms may mimic Alternaria leaf spot. Bacteria may occur on seed and can survive on carrot debris in soil. Bacteria spread within a field by rain or overhead irrigation. Under dry conditions, low levels of bacterial leaf blight may not result in significant crop loss. Under hot and wet conditions, high levels of bacterial blight may develop and lead to premature defoliation and an inability to harvest the roots via a mechanical harvester. Non-Pesticide Carrot | Use disease-free seed. Hot water seed treatment may reduce this seedborne disease. Use temperatures and times of 122 F for 20 minutes for carrot. Rotate to non-host crops for 2 years. Prompt destruction of the finished crop with tillage to rapidly breakdown tissue is an important method to prevent disease build-up. Pesticide copper products (copper hydroxide, copper octanoate, copper oxychloride, copper sulfate, copper diammonium diacetate complex, cuprous oxide) Carrot | Several formulations of copper (Badge, Champ, Kocide) products are labelled for use and may slow the spread of bacterial blight. See label for directions. REI: 4 to 48-hour. PHI: 0-day. FRAC M01. OMRI-listed. Leaf Blight of Root Crops - Alternaria Fungus Scout fields to initiate a spray program when foliar blights are first detected (trace of disease). TOM-CAST with 15 disease severity values (DSVs) can help carrot farmers time their fungicide applications for control of foliar blights. See Disease Forecasting Systems for details. Cercospora leaf spot is sometimes known as early blight. Alternaria leaf blight is sometimes known as late blight. Non-Pesticide Beet, Carrot, Celeriac, Horseradish, Parsnip, Radish, Rutabaga, Turnip | Use disease-free seed. Hot water seed treatment may reduce this seedborne disease. Use temperatures and times of 122 F for 20 minutes for carrot, rutabaga and turnip, 122 F for 15 minutes for radish, or 118 F for 30 minutes for celeriac. Rotate to non-host crops for 2 years. Varieties with partial resistance are available. Prompt destruction of the finished crop with tillage to rapidly breakdown tissue is an important method to prevent disease build-up. Pesticide azoxystrobin products (azoxystrobin) Beet, Carrot, Celeriac, Horseradish, Parsnip, Radish, Rutabaga, Turnip | Rates vary widely depending on crop and application method. REI: 4-hour. PHI: 0-day. FRAC 11. Cabrio EG (20) (pyraclostrobin) Beet, Carrot, Celeriac, Horseradish, Parsnip, Radish, Rutabaga, Turnip | 8-12 oz. per acre. REI: 12-hour. PHI: 0-day FRAC 11. chlorothalonil products (chlorothalonil) Carrot, Horseradish, Parsnip | Several formulations of chlorothalonil (Bravo, Echo, Equus) are labeled at various rates and crops. See label for directions. REI: 12-hour. PHI: 0-day for carrot; 10-day for parsnip; 14-day for horseradish. FRAC M05. Endura (WG) (boscalid) Beet, Carrot, Celeriac, Horseradish, Parsnip, Radish, Rutabaga, Turnip | 4.5 oz. per acre. REI: 12-hour. PHI: 0-day. FRAC 07.

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