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2022 Midwest Vegetable Guide

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Onions and Related Crops – Diseases 224 Midwest Veg Guide 2022 Leaf Blight of Alliums - Botrytis Fungus Non-Pesticide Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Use disease-free seeds and sets. Rotate to non-host crops for 3-4 years. Monitor thrips populations. Prompt destruction of the finished crop and cull piles with tillage to rapidly breakdown tissue is an important method to prevent disease build-up. Pesticide azoxystrobin products (azoxystrobin) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Use 2 lb. a.i. per gallon formulations (Quadris) at 9.0-15.5 fl. oz. per acre. Use 3.3 lb. per gallon formulations (Azteroid) at 5.8-9.7 fl. oz. per acre. Use 0.5 lb. per gallon formulations (Heritage) on greenhouse transplants only at 0.11-0.18 oz. per 1,000 sq. ft. REI: 4-hour. PHI: 0-day. FRAC 11. Cabrio EG (20) (pyraclostrobin) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 12 oz. per acre. Suppression only. REI: 12-hour. PHI: 7-day. FRAC 11. chlorothalonil products (chlorothalonil) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Several formulations of chlorothalonil (Bravo, Echo, Equus) are labeled at various rates. See label for directions. REI: 12-hour. PHI: 7-day for dry bulb onion, shallot, and garlic; 14-day for green bunching onion and leek. FRAC M05. Custodia (SC) (azoxystrobin, tebuconazole) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 12.9 fl. oz. per acre. Suppression only. REI: 12-hour. PHI: 7-day. FRAC 11, FRAC 03. 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. Endura (WG) (boscalid) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 6.8 oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 07. Fontelis (1.67SC) (penthiopyrad) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 16-24 fl. oz. per acre. REI: 12-hour. PHI: 3-day. FRAC 07. Gavel 75DF (zoxamide, mancozeb) Garlic, Onion (Dry), Shallot | 1.5-2 lbs. per acre. REI: 48-hour. PHI: 7-day. FRAC 22, FRAC M03. Inspire Super (EW) (difenoconazole, cyprodinil) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 16-20 fl. oz. per acre. REI: 12-hour. PHI: 7-day for dry bulb onions, shallots, and garlic; 14-day for green bunching onion and leek. FRAC 03, FRAC 09. iprodione products (iprodione) Onion (Dry) | Formulations of iprodione include Nevado and Rovral. REI: 24-hour. PHI: 14-day. FRAC 02. Luna Experience (fluopyram, tebuconazole) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 8-12.8 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 07, FRAC 03. Luna Tranquility (SC) (fluopyram, pyrimethanil) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 16-27 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 07, FRAC 09. 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. Merivon (fluxapyroxad, pyraclostrobin) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 8-11 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 07, FRAC 11. 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. Pristine 38WG (boscalid, pyraclostrobin) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 14.5-18.5 oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 07, FRAC 11. propiconazole products (propiconazole) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 2-8 fl. oz. per acre. PropiMax EC and Tilt are labeled. Use 2-4 fl. oz. per acre rate when tank mixing with another effective fungicide. REI: 12-hour. PHI: 14-day for dry bulb onions, shallots, and garlic; 0-day for green bunching onion and leek. FRAC 03. Quadris Opti (SC) (azoxystrobin, chlorothalonil) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 1.6-3.2 pts. per acre. REI: 12-hour. PHI: 7-day for dry bulb onion, shallots, and garlic; 14-day for green bunching onions and leeks. FRAC 11, FRAC M05. Quilt (SE) (azoxystrobin, propiconazole) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 14-27.5 fl. oz. per acre. REI: 12-hour. PHI: 14-day for dry bulb onions, shallots, and garlic; 0-day for green bunching onions and leeks FRAC 11, FRAC 03. Ridomil Gold Bravo SC (mefenoxam, chlorothalonil) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 2.5 pts. per acre. REI: 48-hour. PHI: 7-day for dry bulb onions,

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