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Potato – Diseases 234 Midwest Veg Guide 2022 Vine Kill Herbicides Defol 5 (5L) (sodium chlorate) 4.8 qts. per acre with 10-20 gals. per acre water by ground or 5-10 gals. per acre water by air. Apply 10 days before harvest. Do not apply in extreme heat during the middle of the day. REI: 12-hour. HRAC NC. paraquat formulations (paraquat) 0.8-1.5 pts. per acre of 2.5L or 0.6-1.3 pt. per acre of 3L in 50-100 gals. of water plus 1 gal. COC or 1-2 pts. nonionic surfactant per 100 gals. spray solution. Not for potatoes to be stored or used for seed. Begin applications when leaves begin to turn yellow. Immature potato foliage and drought-stressed potato foliage are tolerant to this product. Maximum 3 pts. of 2.5L or 2.6 pts. of 3L per acre per season. For split applications, use lower rate and wait 5 days between applications. Read label for complete instructions. 3L formulation not for use in Iowa or Missouri. REI: 24-hour. PHI: 3-day. HRAC 22. RUP. Reglone (2L) (diquat) 1-2 pts. per acre in 20-100 gals. water plus 8-64 fl. oz. nonionic surfactant. A second application can be made if necessary. Allow at least 5 days between applications. REI: 24-hour. PHI: 7-day. HRAC 22. Rely 280 (2.34L) (glufosinate) 21 fl. oz. per acre. Not for potatoes to be used for seed. Do not make more than 1 application. REI: 12-hour. PHI: 9-day. HRAC 10. Scythe (4.2L) (pelargonic acid) 5% to 10% solution in 75 to 200 gals. spray solution per acre. REI: 12-hour. PHI: 24-hour. HRAC NC. Potato – Diseases Reviewed by Dan Egel – Sept 2021 Recommended Controls Aster Yellows (Purple-Top Wilt) of Multiple Crops - Phytoplasma Mollicutes This pathogen is transmitted by leafhoppers. Infection rates can jump when adjacent crops are harvested mid-season, such as alfalfa or wheat. Non-Pesticide Plant only certified seed tubers. Practice clean cultivation. Rogue first infected plants, including tubers. Pesticide Insecticides | Use an insecticide to control leafhoppers that transmit the disease. Leafhoppers must be controlled before they feed. See Insect section. Black Dot of Potatoes - Colletotrichum Fungus Pesticide azoxystrobin products (azoxystrobin) | Use 2 lb. a.i. per gallon formulations (Quadris) at 6.0-20.0 fl. oz. per acre. Use 3.3 lb. per gallon formulations (Azteroid) at 3.9-12.8 fl. oz. per acre. REI: 4-hour. PHI: 14-day. FRAC 11. chlorothalonil products (chlorothalonil) | Michigan only -- Bravo Weather Stik (exp. 12/31/2024), Bravo ZN (exp. 12/31/2025), Echo 720 (exp. 12/31/2024), and Echo 90DF (exp. 12/31/2024) can apply up to 16 lbs. a.i. per acre per year. All other states do not exceed 11.25 lbs. a.i. per acre per year. Several formulations of chlorothalonil (Bravo, Echo, Equus) are labeled at various rates. See product labels. REI: 12-hour. PHI: 7-day. FRAC M05. Headline (SC) (2.08) (pyraclostrobin) | 6-9 fl. oz. per acre. REI: 12-hour. PHI: 3-day. FRAC 11. Luna Tranquility (SC) (fluopyram, pyrimethanil) | 8-11.2 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 07, FRAC 09. Miravis Prime (SC) (pydiflumetofen, fludioxonil) | 9.2- 11.4 fl. oz. per acre. Black dot suppression only. REI: 12- hour. PHI: 14-day. FRAC 07, FRAC 12. Quadris Opti (SC) (azoxystrobin, chlorothalonil) | 1.6 pts. per acre. REI: 12-hour. PHI: 14-day. FRAC 11, FRAC M05. Revus Top (SC) (mandipropamid, difenoconazole) | 5.5- 7.0 fl. oz. per acre. REI: 12-hour. PHI: 14-day. FRAC 40, FRAC 03. Tanos (DF) (famoxadone, cymoxanil) | 6-8 oz. per acre. Black dot Disease suppression only. REI: 12-hour. PHI: 14- day. FRAC 11, FRAC 27. Zing! (zoxamide, chlorothalonil) | 24-34 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 22, FRAC M05. Black Leg of Potatoes - Pectobacterium or Dickeya Bacteria Non-Pesticide Use seed pieces certified to be free of disease. Plant in well- drained soil and avoid over-irrigation. Sanitize equipment at planting and at harvest to limit spread.