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Root Crops – Diseases Midwest Veg Guide 2022 261 Vydate L (2WSL) (oxamyl) Carrot | 1-2 gal. per acre. Apply as a banded or shank-injected pre-plant, at-plant in-furrow or directed post-plant soil treatment with at least 20 gals. water per acre incorporated 2-4 inches deep by water or mechanical means, or overhead chemigate before crop emergence to deliver in 0.5 inch of irrigation water. Allow 14 days between applications. IA, IL, KS, MN, and MO use low rate only and do not exceed 4 applications or 2.5 gals. per acre per season. IN, MI, OH use high rate and do not exceed 8 applications or 8 gals. per acre per season. REI: 48-hour. PHI: 14-day. IRAC 01A. RUP. Viruses of Multiple Crops - Multiple Pathogens Turnip Mosaic Virus is transmitted by multiple species of aphids. In horseradish the pathogen can increase with each growing season as root clones are propagated. Non-Pesticide Horseradish | For TuMV: start new plantings with virus-free root stocks generated from tissue-culture. Pesticide Insecticides Horseradish | For TuMV: maintain an aphid management program. See Insects section. For Brittle Root: maintain a leafhopper management program. See Insects section. White Mold (Timber Rot, Drop, Stem Rot) of Multiple Crops - Sclerotinia Fungus This soil pathogen is long-lived in the soil, and has a wide host range on broadleaved crops and weeds, including beans, vine crops, lettuce, tomatoes, peppers, and cole crops. It goes by other names in other crops, such as Drop, White Mold, Stem Rot, and Timber Rot. It is more commonly found where humidity and temperatures are high. The fungus often infects flowers, which then drop off and infect the stems that they land on. The stems take on a woody appearance and can split open. On root crops, the pathogen infects the root crown and stem, which makes the leaves drop and rot. Inspection of the stems will reveal small black pellets that are the overwintering body of the pathogen. Non-Pesticide Beet, Carrot, Celeriac, Horseradish, Parsnip, Radish, Rutabaga, Turnip | Avoid fields with a history of the problem. Rotate to a non-broadleaf crop, such as grass grains or sweet corn for >6 years. Prompt destruction of the finished crop with tillage to rapidly breakdown tissue is an important method to prevent disease build-up. Anaerobic soil disinfestation (ASD) is an effective sterilization method for greenhouse and high tunnel soils that contain this pathogen. Pesticide Endura (WG) (boscalid) Beet, Carrot, Celeriac, Horseradish, Parsnip, Radish, Rutabaga, Turnip | 7.8 oz. per acre. REI: 12-hour. PHI: 0-day. FRAC 07. Fontelis (1.67SC) (penthiopyrad) Beet, Carrot, Celeriac, Horseradish, Parsnip, Radish, Rutabaga, Turnip | 16-30 fl. oz. per acre. REI: 12-hour. PHI: 0-day. FRAC 07. Luna Sensation (fluopyram, trifloxystrobin) Beet, Carrot, Celeriac, Horseradish, Parsnip, Radish, Rutabaga, Turnip | 7.6 fl. oz. per acre. High rate only allowed on carrots. REI: 12-hour. PHI: 7-day. FRAC 07, FRAC 11. Luna Tranquility (SC) (fluopyram, pyrimethanil) Beet, Carrot, Celeriac, Horseradish, Parsnip, Radish, Rutabaga, Turnip | 11.2 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 07, FRAC 09. Omega 500F (4.17) (fluazinam) Carrot | 1 pt. per acre. REI: 12-hour. PHI: 7-day. FRAC 29. White Rust of Multiple Crops - Albugo Oomycete Non-Pesticide Horseradish, Radish, Rutabaga, Turnip | Use disease-free seed and transplants. Hot water seed treatment may reduce this seedborne disease. Use temperatures and times of 122 F for 20 minutes for rutabaga and turnip, 122 F for 15 minutes for radish. Rotate to non-host crops for 2 years. Varieties with partial resistance are available. Brassica weeds like shepherd's purse, yellow rocket, and wild mustard can host the pathogen and should be managed. Prompt destruction of the finished crop with tillage to rapidly breakdown tissue is an important method to prevent disease build-up. Pesticide Cabrio EG (20) (pyraclostrobin) Horseradish, Radish, Rutabaga, Turnip | 8-16 oz. per acre. REI: 12-hour. PHI: 0- day. FRAC 11. Ridomil Gold Copper (WSB) (mefenoxam, copper hydroxide) Radish | Use as a foliar spray. REI: 48-hour. PHI: 7-day. FRAC 04, FRAC M01.