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Onions and Related Crops – Diseases 228 Midwest Veg Guide 2022 Vangard WG (75) (cyprodinil) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 10 oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 09. Viathon (potassium phosphite, tebuconazole) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 2-3 pts. per acre. REI: 12-hour. PHI: 7-day. FRAC 33, FRAC 03. Zing! (zoxamide, chlorothalonil) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 30 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 22, FRAC M05. Slippery Skin and Sour Rot of Alliums - Burkholderia Bacteria Applying fixed copper products may reduce the spread of these bacterial diseases. For emerged annuals, apply before planting or crop emergence. Pesticide copper products (copper hydroxide, copper octanoate, copper oxychloride, copper sulfate, copper diammonium diacetate complex, cuprous oxide) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Several formulations of copper (Badge, Champ, Kocide) are labelled for use and may slow the spread of bacterial blights. See label for directions. REI: 4 to 48-hour. PHI: 0-day. FRAC M01. OMRI-listed. 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. Smut of Onion - Urocystis Fungus 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. Avoid late- season fertilizer applications or overhead irrigation. Pesticide Elixir (mancozeb, chlorothalonil) Garlic, Onion (Dry), Shallot | 3-3.6 lbs. per acre. REI: 24-hour. PHI: 7-day. FRAC M03, FRAC M05. mancozeb products (mancozeb) Garlic, Onion (Dry), Shallot | Apply as an in-furrow drench at time of seedling. Several formulations of mancozeb (Dithane, Manzate, Penncozeb) are labeled at various rates. See label for directions. REI: 24-hour. PHI: 7-day. FRAC M03. White Rot of Alliums - Stromatinia Fungus This highly destructive soil pathogen is is related to White Mold (Sclerotinia), but only infects onions and related species. There are quarantines in effect to slow its spread from region to region. The fungus infects roots, and then moves to the surface of the bulbs. Inspection of the bulbs will reveal small black pellets that are the overwintering body of the pathogen. Non-Pesticide Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Wash equipment and footwear between fields to avoid transferring fungal propagules from infested fields. Pesticide Custodia (SC) (azoxystrobin, tebuconazole) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Apply foliar spray at 8.6-12.9 fl. oz. per acre. For dry bulb onion and garlic, one application is also allowed at planting with 32 fl. oz. per acre via in-furrow or chemigation. REI: 12-hour. PHI: 14-day for dry bulb onions, shallots, and garlic; 7-day for green bunching onions and leeks, FRAC 11, FRAC 03. Fontelis (1.67SC) (penthiopyrad) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Apply 1.2-1.6 fl. oz. per 1,000 ft. of row as pre-plant, at-plant in-furrow incorporated, transplant drench or drip irrigation application. Or, use 16-24 fl. oz. as foliar applications REI: 12-hour. PHI: 3-day. FRAC 07. iprodione products (iprodione) Garlic | 4 pts. per acre. Formulations of iprodione include Nevado and Rovral. Use as in-furrow spray preplant. REI: 24-hour. PHI: 7-day. FRAC 02. Luna Experience (fluopyram, tebuconazole) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 12.8 fl. oz. per acre. Suppression only. REI: 12-hour. PHI: 7-day. FRAC 07, FRAC 03. Luna Tranquility (SC) (fluopyram, pyrimethanil) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 27 fl. oz. per acre. Suppression only. REI: 12-hour. PHI: 7-day. FRAC 07, FRAC 09. Quadris Opti (SC) (azoxystrobin, chlorothalonil) Garlic, Onion (Dry) | 1.6-3.2 pts. per acre. REI: 12-hour. PHI: 7-day. FRAC 11, FRAC M05. Switch 62.5WG (cyprodinil, fludioxonil) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 11-14 oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 09, FRAC 12.