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Sugarbeet Tolerance to Acifluorfen

Sugarbeet Tolerance to Acifluorfen. Thomas J Peters, Alexa L Lystad, Nathan H Haugrud and Christy L Sprague North Dakota State University / Univ of Minnesota and Michigan State University. Waterhemp is the most important weed control challenge in sugarbeet.

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Sugarbeet Tolerance to Acifluorfen

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  1. Sugarbeet Tolerance to Acifluorfen Thomas J Peters, Alexa L Lystad, Nathan H Haugrud and Christy L Sprague North Dakota State University / Univ of Minnesota and Michigan State University

  2. Waterhemp is the most important weed control challenge in sugarbeet • 246,858 hectares (610,000 acres) sugarbeet in Minnesota and eastern North Dakota in 2018. • Waterhemp was the most important weed control challenge on 103,680 hectares (256,200 acres), 42% of acreage according to survey. • 94% and 95% of surveyed Producers attending 2019 Willmar and Wahpeton Grower seminars, respectfully, used chloroacetamide herbicides for waterhemp control. • Adoption of layered application technique (PRE fb POST, EPOST fb POST or PRE fb EPOST fb POST) increased 805% between the 2014 and 2019 growing seasons.

  3. Waterhemp control group into classes by application timing, averaged across herbicide, herbicide rate, evaluation, location and year.

  4. Producer evaluation*, waterhemp control from chloroacetamide’s applied POST. *2018 Turning Point Survey

  5. Postemergence waterhemp control options • Desmedipham (and phenmedipham) • Inter-row cultivation • Weed-pulling / hoeing • A new herbicide option Image credit: Shoptaugh (1997)

  6. Acifluorfen • Developed by Rohm & Haas and commercialized in 1984. • Acquired by BASF in 1987 to compliment bentazon in soybean. • UPL acquired acifluorfen from BASF in 2003. • Control of pigweed, smartweed, nightshade and jimsonweed in soybean. • Application rate is 0.28 to 0.56 kg ha-1 depending upon weed species and weed height. • Use a nonionic surfactant at 0.13% v/v. • Apply when weeds are small and actively growing. • Use a minimum of 187 L ha-1 water carrier at 276 kPa.

  7. Questions • How much sugarbeet injury is acceptable? • How does environment affect sugarbeet injury? • Does visible growth reduction injury translates to loss of root yield, % sucrose or recoverable sugar? Waterhemp control from acifluorfen at 0.28 kg ha-1 , timed to weeds less than 10-cm

  8. Materials and Methods • Ultra Blazer plus Crop Oil Concentrate • Sugarbeet at the 2 to 4 leaf stage • We selected the hottest day of the week to spray • Managed weeds and diseases to maximize yield and quality

  9. Sugarbeet tolerance to 0.28 kg ha-1acifluorfena at the 2-lf stage, 2016-2018, Hickson, ND aAcifluorfen plus Crop Oil Concentrate at 1.17 L/ha bHerbicide treatments applied with a bicycle wheel plot sprayer delivering 159 L ha-1 at 276 kPa through 8002 nozzles

  10. Sugarbeet tolerance to 0.28 kg ha-1acifluorfena at the 2-lf stage, 2016-2018, Hickson, ND aAcifluorfen plus Crop Oil Concentrate at 1.17 L/ha bHerbicide treatments applied with a bicycle wheel plot sprayer delivering 159 L ha-1 at 276 kPa through 8002 nozzles

  11. Climate data, acifluorfen application, 2016 to 2018, Hickson, ND

  12. Materials and Methods • Acifluorfen plus Crop Oil Concentrate at 1.17 L/ha • Glyphosate plus non-ionic surfactant at 0.25% v/v • Herbicide treatments applied with a bicycle wheel plot sprayer delivering 159 L ha-1 at 276 kPa through 8002 nozzles

  13. Sugarbeet tolerance to acifluorfena at 0.28 kg/ha, at four growth stages, 2018 aAcifluorfen plus Crop Oil Concentrate at 1.17 L ha-1 bMeans followed by a common letter are not significantly different by the Student-Newman-Keuls test at the 5% level of significance

  14. Sugarbeet tolerance to acifluorfena at 0.28 kg/ha, at four growth stages, 2018 aAcifluorfen plus Crop Oil Concentrate at 1.17 L ha-1 bMeans followed by a common letter are not significantly different by the Student-Newman-Keuls test at the 5% level of significance

  15. 1 July 2018 8 July 2018 Ultra Blazer at 2 to 4 lf / Ultra Blazer at 6 lf Ultra Blazer at 10 lf 8 July 2018 16 July 2018 Ultra Blazer at 6 lf Ultra Blazer at 12 lf

  16. Ultra Blazer (24 fl oz) – 4-6lf Ultra Blazer (24 fl oz) – 2lf Ultra Blazer (24 fl oz) – 12lf

  17. Sugarbeet injury and root yield after applications of acifluorfen§ glyphosate – 3X * * Acifluorfen and glyphosate plus AMS in 178 L ha-1 at 207 kPa §Glyphosate at 1.54 kg ha-1 was applied in all treatments at each application timing

  18. Summary • Acifluorfen reduced sugarbeet root yield and recoverable sucrose in two of three environments. • Air temperature and humidity at application may influence sugarbeet injury • Growth reduction injury decreased and necrosis injury increased as sugarbeet growth stage at application increased. • Root yield and recoverable sucrose reduction tended to be less as growth stage at acifluorfen application increased. • These experiments demonstrate sugarbeet tolerate acifluorfen. • Additional experiments are necessary to optimize application timing, adjuvant and environmental conditions at acifluorfen application.

  19. Thank you for your Support Tom Peters • Extension Sugarbeet Agronomist and Weed Control Specialist • thomas.j.peters@ndsu.edu BeetWeedControl @tompeters8131 • 701-231-8131 (office) • 218-790-8131 (mobile)

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