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2022 Midwest Vegetable Guide

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Onions and Related Crops – Diseases 226 Midwest Veg Guide 2022 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. 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. 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. Scala (SC) (5) (pyrimethanil) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 18 fl. oz. per acre. Use 9-18 fl. oz. per acre rate when tank mixing with another effective fungicide. REI: 12-hour. PHI: 7-day. FRAC 09. 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. Vangard WG (75) (cyprodinil) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 10 oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 09. 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. Pink Root of Alliums - Phoma Fungus Plants infected with pink root may appear to be nutrient deficient or drought-stressed and stunted. Affected plants have fewer leaves and begin to form bulbs early. The pathogen can survive in soil as deep as 17.7 inches. Temperatures at 75-82 degrees F favor disease development. The pathogen can spread by onion sets and in infested soil carried by machinery, dust storms, and surface run-off. Pesticide Fontelis (1.67SC) (penthiopyrad) Onion (Dry) | 24 fl. oz. per acre. Michigan only-applicators must possess Section 2 (ee) label. Use as a preplant broadcast and incorporate, then follow with a broadcast or banded application before plants are 3 inches tall before a rain for incorporation. REI: 12-hour. PHI: 3-day. FRAC 07. Purple Blotch of Alliums - Alternaria 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 Aprovia Top (difenoconazole, benzovindiflupyr) Onion (Dry), Onion (Green) | 10.5 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 03, FRAC 07. azoxystrobin products (azoxystrobin) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Use 2 lb. a.i. per gallon formulations (Quadris) at 6.0-12.0 fl. oz. per acre. Use 3.3 lb. per gallon formulations (Azteroid) at 3.9-7.8 fl. oz. per acre. Use 0.5 lb. per gallon formulations (Heritage) on greenhouse transplants only at 0.08-0.15 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 | 8-12 oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 11. 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. 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 | 8.6-12.9 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 11, FRAC 03. 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.

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