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2022 Midwest Vegetable Guide

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Onions and Related Crops – Diseases 222 Midwest Veg Guide 2022 Bulb Rot of Alliums - Pseudomonas Bacteria Pesticide ManKocide (DF) (copper hydroxide, mancozeb) Garlic, Onion (Dry), Shallot | 1.5-2.25 lbs. per acre. REI: 48-hour. PHI: 7-day. FRAC M01, FRAC M03. Damping-Off Seed and Seedling Rots of Multiple Crops - Multiple Pathogens Non-Pesticide Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Use disease-free seeds and sets. Practice good greenhouse sanitation of equipment, tools propagation trays/pots, and surfaces. Avoid excess moisture to the transplants in the greenhouse by monitoring irrigation frequency. Plant in warm field soils. The fungi responsible for damping-off in field soils cause more loss when the seedling is slow to emerge. Pesticide azoxystrobin products (azoxystrobin) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Use 2 lb. a.i. per gallon formulations (Quadris) at 0.4-0.8 fl. oz. per 1,000 row feet. Use 3.3 lb. per gallon formulations (Azteroid) at 0.24-0.48 fl. oz. per 1,000 row feet. Use 0.83 lb. per gallon formulations (Dynasty) for seed treatment at 0.10-0.38 fl. oz. per 100 lbs. of seed. REI: 4-hour. PHI: 0-day. FRAC 11. Ridomil Gold SL (4SC) (mefenoxam) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 0.5-1.0 pts. per acre. Other formulations include MetaStar, Subdue Maxx, Ultra Flourish, and Xyler. Rates vary by formulation. REI: 48-hour. PHI: 0- day. FRAC 04. Uniform (L) (mefenoxam, azoxystrobin) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 0.34 fl. oz. per 1,000 ft. Make one application per crop season. REI: 0-hour. PHI: 0-day. FRAC 04, FRAC 11. Downy Mildew of Multiple Crops - Peronospora Oomycete Cool, wet conditions favor the development of this disease. Can be seedborne or setborne. Non-Pesticide Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Use disease-free seed and sets. Plant in areas with adequate drainage and air movement to reduce leaf wetness and humidity. Rotate to non-host crop for 3 years. Some resistant varieties of onion are available. Avoid late-season fertilizer applications or overhead irrigation. Prompt destruction of the finished crop with tillage to rapidly breakdown tissue is an important method to prevent disease build-up. Destroy onion cull piles and debris. Pesticide Catamaran (potassium phosphite, chlorothalonil) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 4-7 pts. per acre. REI: 12-hour. PHI: 7-day for dry bulb onion, shallot and garlic; 14-day for green bunching onion and leek. FRAC 33, FRAC M05. Cymbol Advance (L) (chlorothalonil, cymoxanil) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 1.6-2.4 pts. per acre. Use lower rates for dry bulb onions and garlic. Other formulations are available such as Ariston. REI: 12-hour. PHI: 7-day for dry bulb onions, and garlic; 14-day for green bunching onions, shallots, leeks. FRAC M05, FRAC 27. Dexter Max (DG) (mancozeb, azoxystrobin) Garlic, Onion (Dry), Shallot | 3.2 lb. per acre. REI: 24-hour. PHI: 7-day. FRAC M03, FRAC 11. Dexter Xcel (mancozeb, azoxystrobin, tebuconazole) Onion (Dry) | 56-72 fl. oz. per acre. REI: See label. PHI: 7- day. FRAC M03, FRAC 11, FRAC 03. Forum (4.17SC) (dimethomorph) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 6 fl. oz. per acre. REI: 12- hour. PHI: 0-day. FRAC 40. Gavel 75DF (zoxamide, mancozeb) Garlic, Onion (Dry), Shallot | 1.5-2 lbs. per acre. REI: 48-hour. PHI: 7-day. FRAC 22, FRAC M03. mancozeb products (mancozeb) Garlic, Onion (Dry), Shallot | Several formulations of mancozeb (Dithane, Manzate, Penncozeb) are labeled at various rates. See label for directions. REI: 24-hour. PHI: 7-day. FRAC M03. Omega 500F (4.17) (fluazinam) Garlic, Onion (Dry), Shallot | 1 pt. per acre. REI: 12-hour. PHI: 7-day. FRAC 29. Orondis Opti Premix (SC) (oxathiapiprolin, chlorothalonil) Garlic, Onion (Dry) | 1.75-2.5 pt. per acre. REI: 12-hour. PHI: 7-day. FRAC 49, FRAC M05. Orondis Ultra Premix (SC) (oxathiapiprolin, mandipropamid) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 5.8-8.0 pts. per acre. REI: 4-hour. PHI: 7-day. FRAC 49, FRAC 40. Reason 500SC (4.13) (fenamidone) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 5.5 fl. oz. per acre. REI: 12- hour. PHI: 7-day. FRAC 11.

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